阅读说明：本技术 一种加氢催化剂载体的制备方法及产品 (Preparation method of hydrogenation catalyst carrier and product ) 是由 张瑜平 傅骐 于 2019-02-22 设计创作，主要内容包括：本发明公开了一种加氢催化剂载体的制备方法及产品,涉及催化剂载体领域,要解决的是现有加氢催化剂的载体使用效果不佳的问题。本发明具体步骤如下：步骤一,将两种不同孔结构的活性氧化铝粉混合,再向其中加入硝酸、醋酸、柠檬酸和水并且高速搅拌,得到第一混合物；步骤二,将第一混合物升温并且保温,冷却并且过筛,再向其中加入乌洛托品水溶液并且边加入边搅拌,再进行低温老化并且油浴成型,然后再进行烘干和焙烧,即得到成品。本发明制备工艺合理,以不同的活性氧化铝粉为原料进行催化剂载体的制备,制备的载体与同类载体相比,具有比表面积大、强度高和堆积密度低的优点,更适合于作为以贵金属为活性组分的加氢催化剂的载体。(The invention discloses a preparation method of a hydrogenation catalyst carrier and a product, relates to the field of catalyst carriers, and aims to solve the problem that the carrier of the existing hydrogenation catalyst is poor in use effect. The method comprises the following specific steps: mixing two kinds of active alumina powder with different pore structures, adding nitric acid, acetic acid, citric acid and water into the mixture, and stirring the mixture at a high speed to obtain a first mixture; and step two, heating the first mixture, preserving heat, cooling, sieving, adding the urotropine aqueous solution while stirring, aging at low temperature, performing oil bath forming, drying and roasting to obtain the finished product. The preparation process is reasonable, different active alumina powder is used as raw materials to prepare the catalyst carrier, and compared with the similar carrier, the prepared carrier has the advantages of large specific surface area, high strength and low bulk density, and is more suitable to be used as the carrier of a hydrogenation catalyst taking noble metal as an active component.)

1. A preparation method of a hydrogenation catalyst carrier is characterized by comprising the following specific steps:

mixing two kinds of active alumina powder with different pore structures, adding nitric acid, acetic acid, citric acid and water into the mixture, and stirring the mixture at a high speed to obtain a first mixture;

and step two, heating the first mixture to 75-86 ℃, preserving heat for 4-12 minutes, cooling and sieving by a 60-90-mesh sieve to obtain a second mixture, adding a urotropine aqueous solution into the second mixture while stirring, performing low-temperature aging, performing oil bath forming at 80-90 ℃, and then drying and roasting to obtain a finished product.

2. The method for preparing a hydrogenation catalyst carrier as recited in claim 1, wherein the two active alumina powders with different pore structures in the first step comprise a first active alumina powder and a second active alumina powder, the first active alumina powder has a dry-basis bulk density of 0.20-0.35g/mL and a specific surface area of 300-550m²Per g, pore volume of 0.85-1.20cm³(ii)/g, the dry-basis bulk density of the second activated alumina powder is 0.28-0.35g/mL, the specific surface area is 330-²Per g, pore volume of 0.8-0.9cm³/g。

3. The method for preparing a hydrogenation catalyst carrier according to claim 2, wherein the mass ratio of the first active alumina powder to the second active alumina powder is 1-8: 1.

4. The method for preparing a hydrogenation catalyst carrier according to claim 1, wherein in the first step, the mass of the nitric acid is 1-3% of the mass of the first mixture, the mass of the acetic acid is 0.1-1% of the mass of the first mixture, and the mass of the citric acid is 0.05-2% of the mass of the first mixture.

5. The method for preparing a hydrogenation catalyst carrier as claimed in claim 1, wherein the mass of urotropin in the urotropin aqueous solution in the second step is 0.45-2.25% of the total mass of the urotropin aqueous solution and the second mixture.

6. The method for preparing a hydrogenation catalyst carrier according to claim 1, wherein the cooling temperature in the second step is 8-12 ℃, the low-temperature aging temperature is 1-15 ℃, and the time is 4-36 hours.

7. The method for preparing a hydrogenation catalyst carrier as claimed in claim 1 or 6, wherein the temperature for drying in the second step is 110-128 ℃, the temperature for calcining is 780-840 ℃, and the time for calcining is 3-5.5 hours.

8. A product produced by the method for producing a hydrogenation catalyst carrier according to any one of claims 1 to 7.

Technical Field

The invention relates to the field of catalyst carriers, in particular to a preparation method of a hydrogenation catalyst carrier.

Background

The catalyst is a substance which can change the chemical reaction rate (increase or decrease) of a reactant in a chemical reaction without changing chemical equilibrium, and the mass and chemical properties of the catalyst are not changed before and after the chemical reaction. Catalysts are of great importance in the modern chemical industry, for example, iron catalysts for ammonia synthesis, vanadium catalysts for sulfuric acid production, ethylene polymerization and the production of rubber from butadiene, all using different catalysts.

The variety of catalysts is various, the industry is rapidly developed, the demand is continuously increased, people consider how to fully exert the catalytic efficiency of the catalyst in many cases, realize that a catalyst carrier has a crucial role on the performance of the catalyst, and consider the performance of the carrier in many cases, and the performance of the carrier mainly refers to the strength, the bulk density, the specific surface and the pore volume of the carrier, which is the key for improving the performance of the catalyst.

The hydrogenation catalyst is a commonly used catalyst, but the existing hydrogenation catalyst has low carrier strength, small pore volume and poor use effect.

Disclosure of Invention

The present invention aims to provide a preparation method of a hydrogenation catalyst carrier, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a preparation method of a hydrogenation catalyst carrier comprises the following specific steps:

mixing two kinds of active alumina powder with different pore structures, adding nitric acid, acetic acid, citric acid and water into the mixture, and stirring the mixture at a high speed to obtain a first mixture;

and step two, heating the first mixture to 75-86 ℃, preserving heat for 4-12 minutes, cooling and sieving by a 60-90-mesh sieve to obtain a second mixture, adding a urotropine aqueous solution into the second mixture while stirring, performing low-temperature aging, performing oil bath forming at 80-90 ℃, and then drying and roasting to obtain a finished product.

As a further scheme of the invention: the two active alumina powders with different pore structures in the first step comprise a first active alumina powder and a second active alumina powder, wherein the dry-basis bulk density of the first active alumina powder is 0.20-0.35g/mL, and the specific surface area is 300-550m²Per g, pore volume of 0.85-1.20cm³The dry-basis bulk density of the second activated alumina powder is 0.28-0.35g/mL, and the specific surface area is 330-390m²Per g, pore volume of 0.8-0.9cm³/g。

As a further scheme of the invention: the mass ratio of the first active alumina powder to the second active alumina powder is 1-8: 1.

As a further scheme of the invention: in the first step, the mass of the nitric acid is 1-3% of the mass of the first mixture, the mass of the acetic acid is 0.1-1% of the mass of the first mixture, and the mass of the citric acid is 0.05-2% of the mass of the first mixture.

As a further scheme of the invention: in the second step, the mass of the urotropine in the urotropine aqueous solution is 0.45-2.25% of the total mass of the urotropine aqueous solution and the second mixture.

As a further scheme of the invention: and in the second step, the cooling temperature is 8-12 ℃, the low-temperature aging temperature is 1-15 ℃, and the time is 4-36 hours.

As a further scheme of the invention: the temperature for drying in the second step is 110-128 ℃, the temperature for roasting is 780-840 ℃, and the time for roasting is 3-5.5 hours.

The nitric acid, acetic acid and citric acid are all industrial acids.

Compared with the prior art, the invention has the beneficial effects that:

the preparation process is reasonable, different active alumina powder is used as raw materials to prepare the catalyst carrier, and compared with the similar carrier, the prepared carrier has the advantages of large specific surface area, high strength and low bulk density, is more suitable to be used as a carrier of a hydrogenation catalyst taking noble metal as an active component, and has wide application prospect.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

The invention takes noble metals of ruthenium, rhodium, palladium and platinum as active components, the mass of the active components is 0.1-5.0% of the mass of the catalyst, nickel, cobalt and manganese are selected as auxiliary agents, the mass of the auxiliary agents is 0.05-5.0% of the mass of the catalyst, and the preparation of the catalyst and the evaluation of the performance are carried out.