Catalyst for producing acrylic acid by acrolein oxidation

文档序号：1725548 发布日期：2019-12-20 浏览：14次中文

阅读说明：本技术 丙烯醛氧化生产丙烯酸催化剂 (Catalyst for producing acrylic acid by acrolein oxidation ) 是由王伟华宋卫林徐文杰杨斌汪国军于 2018-06-12 设计创作，主要内容包括：本发明涉及丙烯醛氧化生产丙烯酸催化剂,主要解决现有催化剂丙烯醛转化率低和丙烯酸收率低的问题,通过采用丙烯醛氧化生产丙烯酸催化剂,包括载体和负载于载体上的活性组分,所述活性组分通式表示为：VMoaMgbWcXdYeZfOg,其中X为包括选自Sc、Ti、Y、Zr、Hf、Ta、Cr中的一种或多种,Y为包括选自Ga、Ge、In、Sn、TI、Pb、Cd、Mn、Tc、Re、Rh、Ir、Pd、Pt、Ag、Au、La中的至少一种,Z为选自碱金属或碱土金属中的一种或多种的技术方案,较好地解决了该技术问题,可用于丙烯酸的工业生产中。(The invention relates to an acrylic acid catalyst produced by acrolein oxidation, which mainly solves the problems of low acrolein conversion rate and low acrylic acid yield of the existing catalyst, and the acrylic acid catalyst produced by acrolein oxidation comprises a carrier and an active component loaded on the carrier, wherein the general formula of the active component is as follows: VMo a Mg b W c X d Y e Z f O g Wherein X is one or more selected from Sc, Ti, Y, Zr, Hf, Ta and Cr, and Y isComprises at least one of Ga, Ge, In, Sn, TI, Pb, Cd, Mn, Tc, Re, Rh, Ir, Pd, Pt, Ag, Au and La, and Z is one or more of alkali metals or alkaline earth metals, thereby better solving the technical problem and being applicable to the industrial production of acrylic acid.)

1. The catalyst for producing acrylic acid by acrolein oxidation comprises a carrier and an active component loaded on the carrier, wherein the active component is represented by a general formula: VMo_aMg_bW_cX_dY_eZ_fO_gWherein X is selected from one or more of Sc, Ti, Y, Zr, Hf, Ta and Cr, Y is selected from at least one of Ga, Ge, In, Sn, TI, Pb, Cd, Mn, Tc, Re, Rh, Ir, Pd, Pt, Ag, Au and La, and Z is selected from one or more of alkali metal or alkaline earth metal; a is the molar ratio of Mo to V, and the value of a is 2.0-8.0; b is the molar ratio of Mg to V, and the value of b is 0.2-0.8; c is the molar ratio of W to V, and the value of c is 0.2-1.0; d is the molar ratio of X to V, and the value of d is 0.2-1.0; e is the molar ratio of Y to V, and the value of e is 0.05-1.2; f is the molar ratio of Z to V, and the value of f is 0.05-1.2; g is the mole number of oxygen atoms needed to satisfy the valence of each element in the active component.

2. The catalyst according to claim 1, wherein the active component content in the catalyst is 10 to 60 w% by weight.

3. The catalyst according to claim 1, wherein the carrier content in the catalyst is 40 to 90 w% by weight.

4. The catalyst according to claim 1, wherein the carrier is at least one selected from the group consisting of alumina, lithium oxide, magnesia, zirconia, silica and titania.

5. A method of preparing the catalyst of claim 1, comprising:

mixing the dispersion liquid of the active component elements with a carrier;

and (4) roasting.

6. The method according to claim 5, wherein the dispersion is a solution, a suspension or a mixture of a solution and a suspension.

7. The method according to claim 5, wherein the calcination temperature is 300 to 550 ℃.

8. The method according to claim 5, wherein the calcination time is 1 to 12 hours.

9. The method according to claim 5, wherein the atmosphere for calcination is an inert atmosphere or an atmosphere containing O₂Of the atmosphere (c).

10. Use of the catalyst of claim 1 in the manufacture of acrylic acid by oxidation of acrolein.

Technical Field

The invention relates to a catalyst for producing acrylic acid by acrolein oxidation, a preparation method thereof and application thereof in preparing acrylic acid by acrolein oxidation.

Background

Acrolein is the simplest unsaturated aldehyde, is an important chemical synthesis intermediate, and is widely used for synthesis of important chemical products such as picoline, pyridine, glutaraldehyde, acrylic acid and the like. Acrylic acid is an important organic chemical raw material, is mainly used for manufacturing multifunctional high polymer materials such as acrylates, and is widely applied to the fields of papermaking, leather, coating, textile, plastics, rubber, oil additives, petroleum exploitation and the like. In recent years, the market demand for acrylic acid has increased worldwide, and the production of acrylic acid has been a focus of research.

The synthesis of acrylic acid by the acrolein oxidation process is currently used on a large industrial scale. The catalyst used for synthesizing acrylic acid by acrolein oxidation method is generally Mo-V series oxide, the basic elements of the catalyst are Mo and V, and other elements used for improving the performance of the catalyst, such as Nb, Sn, Cr, W, Fe, Co, Ni, Sb and the like, are added. US Pat7220698B2 describes the introduction of a trace amount of a catalyst poison into the catalyst preparation process to inhibit thermal degradation of the catalyst and provide stability to the catalyst. US Pat7456129B2 describes varying acid content, controlling acid strength, and improving catalyst performance during catalyst support preparation. CN 16997701 and CN1210511 propose a preparation method of a composite oxide catalyst, which is to Co-precipitate mixed liquor of various element components (containing Fe, Co, Mo, V, Bi, Ni, etc.), dry into powder, perform tabletting, extrusion molding, and finally bake to obtain the composite oxide catalyst. The acrylic acid catalyst can be successfully prepared by the methods and the performance of the catalyst is improved, but the catalyst has poor mechanical strength and low catalytic activity ratio, so that the practical application is limited.

The active components of the catalyst are loaded on the carrier with large specific surface area, so that the mechanical strength of the catalyst can be increased, the loading capacity of the active components is greatly increased, and the active components of the catalyst are exerted to a great extent through a synergistic effect. CN1130172 (preparation method of acrylic acid) describes a preparation method of a spherical catalyst, in which a carrier is added into an active component mixed solution, and is evaporated and dried, so that the active component is deposited on the surface of the carrier. However, the catalytic activity, selectivity and yield of the acrylic acid catalyst obtained in the prior art need to be further improved.

Disclosure of Invention

The invention aims to solve the technical problems of low acrolein conversion rate and low acrylic acid yield of the existing catalyst, and provides a novel catalyst for producing acrylic acid by oxidizing acrolein, wherein the catalyst has the characteristics of high acrolein conversion rate and high acrylic acid yield.

The second technical problem to be solved by the invention is a preparation method of the catalyst.

The invention solves the technical problem of the prior art, and the other technical problem is the application of the catalyst.

In order to solve one of the above technical problems, the technical solution of the present invention is as follows:

the catalyst for producing acrylic acid by acrolein oxidation comprises a carrier and an active component loaded on the carrier, wherein the active component is represented by a general formula: VMo_aMg_bW_cX_dY_eZ_fO_gWherein X is selected from one or more of Sc, Ti, Y, Zr, Hf, Ta and Cr, Y is selected from at least one of Ga, Ge, In, Sn, TI, Pb, Cd, Mn, Tc, Re, Rh, Ir, Pd, Pt, Ag, Au and La, and Z is selected from one or more of alkali metal or alkaline earth metal; a is the molar ratio of Mo to V, and the value of a is 2.0-8.0; b is the molar ratio of Mg to V, and the value of b is 0.2-0.8; c is the molar ratio of W to V, and the value of c is 0.2-1.0; d is the molar ratio of X to V, and the value of d is 0.2-1.0; e is the molar ratio of Y to V, and the value of e is 0.05-1.2; f is the molar ratio of Z to V, and the value of f is 0.05-1.2; g is the mole number of oxygen atoms needed to satisfy the valence of each element in the active component.

In the above-mentioned embodiments, as one of preferable embodiments, Y preferably includes Tc and Re together, and Tc and Re have a synergistic effect in improving the yield of acrylic acid.

In the above-mentioned second preferred embodiment, Y preferably includes both Tc and Mn, and Tc and Mn have a synergistic effect in increasing the yield of acrylic acid.

In the above technical solution, as a third preferred technical solution, Y preferably includes Tc and La simultaneously, and Tc and La have a synergistic effect in improving the yield of acrylic acid.

In the above technical solutions, as one of the more preferable technical solutions, Y simultaneously includes Tc, Re and Mn, and the three have a synergistic effect of ternary combination in the aspect of improving the yield of acrylic acid.

In the above-mentioned second preferred embodiment, Y simultaneously includes Tc, Mn and La, and the three components have a synergistic effect of ternary combination in improving the yield of acrylic acid.

In the above-mentioned technical solutions, as a third preferred technical solution, Y simultaneously includes Tc, Re and La, and the three have a synergistic effect of ternary combination in the aspect of improving the yield of acrylic acid.

In the above technical scheme, the molar ratio of Mo to V may be, but not limited to, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 7.0, and the like.

In the above technical scheme, the molar ratio of Mg to V may be, but not limited to, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, and the like.

In the above technical scheme, the molar ratio of W to V may be, but not limited to, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, and the like.

In the above technical solution, the molar ratio of Cr to V may be, but not limited to, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, and the like.

In the above technical scheme, the molar ratio of Na to V may be, but not limited to, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, and the like.

In the above technical scheme, the molar ratio of Tc to V may be, but not limited to, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, etc.

In the above technical scheme, the molar ratio of Re to V may be, but not limited to, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, etc.

In the above technical scheme, the molar ratio of Mn to V may be, but not limited to, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, and the like.

In the above technical scheme, the molar ratio of La to V may be, but not limited to, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, etc.

In the above technical scheme, more specific examples of the general formula of the active ingredient can be, but are not limited to:

VMo_2.0～8.0Mg_0.2～0.8W_0.2～1.0Cr_0.2～1.0Tc_0.05～0.60Re_0.05～0.60Na_0.05～1.2O_g；

VMo_2.0～8.0Mg_0.2～0.8W_0.2～1.0Cr_0.2～1.0Tc_0.05～0.60Mn_0.05～0.60Na_0.05～1.2O_g；

VMo_2.0～8.0Mg_0.2～0.8W_0.2～1.0Cr_0.2～1.0Tc_0.05～0.60La_0.05～0.60Na_0.05～1.2O_g；

VMo_2.0～8.0Mg_0.2～0.8W_0.2～1.0Cr_0.2～1.0Tc_0.05～0.45Re_0.05～0.3Mn_0.05～0.45Na_0.05～1.2O_g；

VMo_2.0～8.0Mg_0.2～0.8W_0.2～1.0Cr_0.2～1.0Tc_0.05～0.45Mn_0.05～0.3La_0.05～0.45Na_0.05～1.2O_g；

VMo_2.0～8.0Mg_0.2～0.8W_0.2～1.0Cr_0.2～1.0Tc_0.05～0.45Re_0.05～0.3La_0.05～0.45Na_0.05～1.2O_g；

wherein g is the mole number of oxygen atoms required to satisfy the valence of each element in the active component.

In the technical scheme, the content of the active component in the catalyst is preferably 10-60 w% by weight.

In the technical scheme, the content of the carrier in the catalyst is preferably 40-90 w% by weight.

In the above technical solutions, the shape and size of the carrier are not particularly limited, and all the carriers can obtain comparable technical effects, for which the skilled person can reasonably select. For convenience of comparison, the carriers of the embodiments of the present invention are all spherical.

In the above technical solution, the support is preferably at least one of alumina, lithium oxide, magnesia, zirconia, silica and titania.

To solve the second technical problem, the technical solution of the present invention is as follows:

the method for preparing a catalyst according to any of the preceding technical problems, comprising:

mixing the dispersion liquid of the active component elements with a carrier;

and (4) roasting.

In the above technical solution, the dispersion may be a solution, a suspension, or a mixture of a solution and a suspension.

In the above technical solution, the conditions for calcination are not particularly limited as long as the conditions are such that the specific compounds of all the active elements present in the dispersion can be calcined to the form of oxides, and those skilled in the art can select the conditions for calcination appropriately without creative efforts.

In the above technical scheme, the roasting temperature is 300-550 ℃ by way of example only.

In the above technical scheme, the roasting time is 1-12 hours, which is only an example.

In the above technical scheme, the roasting atmosphere is an inert atmosphere or an atmosphere containing O by way of example only₂Of the atmosphere (c). However, the atmosphere for the calcination is preferably air from the economical viewpoint. If it isIt is not specifically noted that the atmosphere for calcination in the present invention is air.

In the above technical scheme, the catalyst can be prepared by a two-step loading method, specifically as follows:

1. preparation of active element solution

Dissolving a compound of the required active component element to obtain an aqueous solution of the active element; the dissolution step is not particularly limited, and the specific dissolution procedure and process conditions may be appropriately selected by those skilled in the art.

2. Active element loading

2.1 first step load

And (3) mixing the carrier particles with the aqueous solution of the active element obtained in the step (1) (wherein the dosage of the aqueous solution of the active element is 5-50 w% of the required amount of the catalyst), and drying to obtain a catalyst precursor I. The drying temperature can be, but is not limited to, 60-100 ℃, and the drying time can be, but is not limited to, 2-8 hours.

2.2 second step load

Spraying the active element slurry obtained in the step 1 on the catalyst precursor I obtained in the step 2.1, and drying the mixture of the catalyst precursor I and the active element to obtain a catalyst precursor II; wherein the spraying operation and the drying operation are carried out simultaneously or alternately, and no adhesion between particles is suitable, and in order to achieve the degree, the skilled person can match the drying operation process by adjusting the slurry spraying operation. The drying can be carried out by hot air, and the temperature of the hot air can be, but is not limited to, 60-120 ℃.

3. Roasting

Calcining the catalyst precursor II to obtain the catalyst. The catalyst precursor II may further comprise a drying step before calcination, wherein the drying temperature is, for example and without limitation, 60-100 ℃, and the drying time is, for example and without limitation, 2-12 hours. The roasting temperature is, for example, but not limited to, 300-550 ℃, and the roasting time is, for example, but not limited to, 1-12 hours.

The catalyst prepared by the two-step supporting method is surprisingly better in acrolein conversion rate and acrylic acid yield than other methods.

To solve the third technical problem, the technical scheme of the invention is as follows: use of a catalyst according to any of the preceding claims for the preparation of acrylic acid by oxidation of acrolein.

The technical key of the invention is the selection of the catalyst, which can be reasonably selected by the skilled person for the specific application method and process conditions without creative efforts, such as:

a process for producing acrylic acid by oxidizing acrolein, which comprises reacting acrolein with an oxygen-containing oxidizing gas in the presence of the catalyst according to any one of the above-mentioned technical problems.

In the above technical scheme, in order to make the reaction more stable and controllable, the reaction is preferably carried out in the presence of a dilute gas phase material.

In the above embodiment, the oxidizing gas may be pure oxygen or oxygen-rich, but air is preferred from the economical viewpoint.

In the above technical solution, the dilute gas phase material is preferably steam.

In the technical scheme, the reaction temperature can be selected from 100-500 ℃.

In the above technical scheme, in the raw material gas composed of acrolein, air and water vapor, in terms of volume ratio, acrolein: air: the steam is 1 (1-6) and 0.5-5.

In the technical scheme, the volume space velocity of the feed gas is 800-2000 hours^-1。

The catalyst evaluation method of the present invention is as follows:

a reactor: a fixed bed reactor with an inner diameter of 25 mm and a reactor length of 750 mm;

catalyst loading: 200 g;

reaction temperature: 280 ℃;

reaction time: 4 hours;

the volume ratio of raw materials is as follows: acrolein: air: water vapor 1: 3.5: 2;

total volume space velocity of raw materials: 1400 hours^-1。

Acrolein conversion and acrylic acid yield are defined as follows:

acrolein conversion ═ 100% (molar amount of acrolein reaction/molar amount of acrolein total added);

the yield of acrylic acid (molar amount of acrylic acid produced/total molar amount of acrolein added) × 100%.

The catalyst of the present invention has acrolein converting rate up to 99% and acrylic acid yield up to 96%, and may be used in industrial production of acrylic acid.

Detailed Description

[ example 1 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.04 mol Tc (formula: tc₂O₇) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Tc_0.4Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

A spherical alumina carrier (BET specific surface area of 3 m) with a diameter of 5mm was used²Per g, pore volume of 0.1m³/g)200g was mixed with 50g of the solution II uniformly and dried at 80 ℃ for 4 hours to obtain a catalyst precursor I.

And a second step of loading: solution spraying

And (2) putting the catalyst precursor I in a coating machine, spraying a solution II on the catalyst precursor I under rotation, blowing hot air at 90 ℃ to the catalyst precursor I sprayed with the solution II for drying, spraying and drying simultaneously without adhesion among particles, and obtaining the catalyst precursor II after the slurry I is completely sprayed to the catalyst precursor I.

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.4Na_0.4O_g+70w％Al₂O₃。

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 2 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Rhenium heptoxide (molecular formula: re₂O₇) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Re_0.4Na_0.4O_gAt a concentration of 0.4g/g, to giveAnd (3) solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Re_0.4Na_0.4O_g+70w％Al₂O₃

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 3 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Manganese nitrate containing 0.04 mol of Mn (molecular formula: mn (NO)₃)₂) Sodium nitrate containing 0.04 mol of Na(molecular formula is NaNO)₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Mn_0.4Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Mn_0.4Na_0.4O_g+70w％Al₂O₃

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 4 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Containing 0.4 mol of MoAmmonium molybdate (molecular formula is (NH)₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Lanthanum oxide containing 0.04 mol of La (formula: la₂O₃) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4La_0.4Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4La_0.4Na_0.4O_g+70w％Al₂O₃

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 5 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.02 mol Tc (formula: tc₂O₇) Rhenium heptoxide (molecular formula: re₂O₇) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Tc_0.2Re_0.2Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.2Re_0.2Na_0.4O_g+70w％Al₂O₃。

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 6 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.02 mol Tc (formula: tc₂O₇) Manganese nitrate containing 0.02 mol of Mn (molecular formula: mn (NO)₃)₂) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Tc_0.2Mn_0.2Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

Oxidizing spherical shape with diameter of 5mmAluminum support (BET specific surface area 3 m)²Per g, pore volume of 0.1m³/g)200g was mixed with 50g of the solution II uniformly and dried at 80 ℃ for 4 hours to obtain a catalyst precursor I.

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.2Mn_0.2Na_0.4O_g+70w％Al₂O₃。

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 7 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.02 mol Tc (formula: tc₂O₇) Lanthanum oxide containing 0.02 mol of La (molecular formula: la₂O₃) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Nitric acid containing 0.04 mol of MgMagnesium (molecular formula: Mg (NO))₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Tc_0.2La_0.2Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.2La_0.2Na_0.4O_g+70w％Al₂O₃。

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 8 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.015 mol of Tc (molecular formula: tc₂O₇) Rhenium heptoxide (molecular formula: re₂O₇) Manganese nitrate containing 0.015 mol of Mn (molecular formula: mn (NO)₃)₂) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Tc_0.15Re_0.1Mn_0.15Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.15Re_0.1Mn_0.15Na_0.4O_g+70w％Al₂O₃

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 9 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.015 mol of Tc (molecular formula: tc₂O₇) Manganese nitrate containing 0.01 mol of Mn (molecular formula: mn (NO)₃)₂) Lanthanum oxide containing 0.015 mol of La (molecular formula: la₂O₃) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, evaporating at 80 deg.C until the mixed solution is equivalent to VMo containing active component₄Mg_0.4W_0.4Cr_0.4Tc_0.15Mn_0.1La_0.15Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.15Mn_0.1La_0.15Na_0.4O_g+70w％Al₂O₃

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

[ example 10 ]

1. Preparation of active element solution

Ammonium metavanadate (molecular formula: NH) containing 0.1 mol of V₄VO₃) Dissolved in hot water (200 g) at 80 ℃. Ammonium molybdate (molecular formula is (NH)) containing 0.4 mol of Mo₄)₂MoO₄) Adding the mixture, and respectively adding ammonium tungstate (molecular formula: (NH)₄)₁₀W₁₂O₄₁) Ammonium chromate containing 0.04 mol Cr (formula: (NH)₄)₂CrO₄) Technetium heptaoxide containing 0.015 mol of Tc (molecular formula: tc₂O₇) Rhenium heptoxide (molecular formula: re₂O₇) Lanthanum oxide containing 0.015 mol of La (molecular formula: la₂O₃) Sodium nitrate (molecular formula of NaNO) containing 0.04 mol of Na₃) And stirred to dissolve the whole solution to obtain a solution I. Magnesium nitrate (molecular formula: Mg (NO): containing 0.04 mol of Mg₃)₂) Adding the aqueous solution into the above solutions respectively, mixing, and evaporating at 80 deg.C until the mixture solution is equivalentIn the presence of active ingredient VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.15Re_0.1La_0.15Na_0.4O_gWas 0.4g/g, to obtain a solution II.

2. Active element loading

First-step loading: solution impregnation

And a second step of loading: solution spraying

3. Roasting

The catalyst precursor II was dried at 90 ℃ for 6 hours and calcined at 400 ℃ for 3 hours to give a catalyst having the following composition:

30w％VMo₄Mg_0.4W_0.4Cr_0.4Tc_0.15Re_0.1La_0.15Na_0.4O_g+70w％Al₂O₃

4. catalyst evaluation

The acrolein conversion and acrylic acid yield were examined.

The evaluation results of the supporting step in the catalyst and the catalyst are shown in Table 1 for convenience of comparison.

TABLE 1

13页详细技术资料下载

上一篇：一种医用注射器针头装配设备

下一篇：合成丙烯酸的催化剂

Catalyst for producing acrylic acid by acrolein oxidation

相关技术

网友询问留言