阅读说明：本技术 一种脱硝催化剂载体及其制备方法 (Denitration catalyst carrier and preparation method thereof ) 是由 范兰 张锐 丰晓芳 许琦 陈小卫 宋夫交 于 2021-10-11 设计创作，主要内容包括：本发明涉及一种脱硝催化剂载体及其制备方法,所述脱硝催化剂载体的原料组成及质量分数为：堇青石60%-75%,改性剂25%-40%。本发明通过改性剂对堇青石表面改性,提高堇青石催化剂载体的催化活性、机械强度和使用寿命。本发明的目的是通过制备多组分的催化剂载体,从而提高单一堇青石催化剂载体的性能。(The invention relates to a denitration catalyst carrier and a preparation method thereof, wherein the denitration catalyst carrier comprises the following raw materials in percentage by mass: 60-75% of cordierite and 25-40% of modifier. The invention modifies the surface of cordierite through a modifier, thereby improving the catalytic activity, mechanical strength and service life of the cordierite catalyst carrier. It is an object of the present invention to improve the performance of a single cordierite catalyst carrier by preparing a multi-component catalyst carrier.)

1. A denitration catalyst carrier is characterized by comprising 60-75 wt% of cordierite and 25-40 wt% of modifier.

2. The denitration catalyst carrier of claim 1, wherein the modifier consists of tetraethoxysilane and a metal salt, wherein the mass ratio of tetraethoxysilane to the metal salt is (40-50): (50-60).

3. The denitration catalyst support according to claim 2, wherein the metal salt includes two or more of an aluminum salt, a titanium salt, a manganese salt, and a cerium salt.

4. The denitration catalyst support of claim 3, wherein the metal salt is composed of 0-50wt% of aluminum salt, 0-50wt% of titanium salt, 0-50wt% of manganese salt and 0-50wt% of cerium salt.

5. A method for preparing the denitration catalyst support of any one of claims 1 to 4, comprising the steps of:

step 1: mixing two or three of aluminum salt, titanium salt, manganese salt and cerium salt according to the proportion of 0-50wt% of aluminum salt, 0-50wt% of titanium salt, 0-50wt% of manganese salt and 0-50wt% of cerium salt to obtain metal salt, adding the metal salt into ethanol with the mass of 3-4 times that of the metal salt, uniformly stirring, adding distilled water with the mass of 1.5-2 times that of the metal salt, and continuously stirring to obtain a first mixed solution;

step 2: dissolving tetraethoxysilane in ethanol with the mass 2-3 times that of tetraethoxysilane, adding the obtained solution into the first mixed solution, and uniformly stirring to obtain a second mixed solution;

and step 3: adding hydrochloric acid with the concentration of 20% and the mass of 1.5-2 times that of the ethyl orthosilicate into the second mixed solution, stirring for 6-8 hours, and heating at the constant temperature of 85-95 ℃ for 8-10 hours to obtain sol;

and 4, step 4: pickling cordierite with 35% hydrofluoric acid at normal temperature for 4-5 hours, washing with distilled water to be neutral, adding the mixture into the sol obtained in the step 3, and performing ball milling on the cordierite and the sol obtained in the step 3 according to the proportion of 60-75 wt% and 25-40 wt% to obtain gel after 7-8 hours;

and 5: and (3) calcining the gel obtained in the step (4) for 3-4 hours in the air atmosphere of 500-600 ℃, cooling and sieving to obtain the final product.

Technical Field

The invention belongs to the field of denitration catalysts, and particularly relates to a denitration catalyst carrier and a preparation method thereof.

Background

The nitrogen oxides released by coal combustion are one of main atmospheric pollutants, and seriously threaten the living environment of human beings. The reduction of nitrogen oxide emissions during the combustion release of coal has become a problem that is urgently needed to be solved at present. At present, two main methods for reducing the emission of nitrogen oxides are available: the advanced coal combustion technology is adopted, so that the generation of nitrogen oxides is reduced; and carrying out denitration treatment on waste gas generated by coal combustion.

Among the denitration technologies, Selective Catalytic Reduction (SCR) has become the mainstream technology for reducing the emission of nitrogen oxides in the world due to its advantages of high denitration efficiency and high stability. In the SCR technology, the catalyst is the core, and the performance of the catalyst will directly determine the SCR denitration success. The carrier is an indispensable important component of the catalyst, and the current catalyst carriers mainly comprise titanium dioxide, silicon oxide, aluminum oxide, cordierite and the like. The single-component catalyst carrier has the defects of poor catalytic activity, low strength and easy abrasion, and the activity and the stability of the denitration catalyst are seriously influenced. The above-mentioned disadvantages can be effectively improved by preparing a multi-component catalyst carrier.

Disclosure of Invention

The invention provides a denitration catalyst carrier and a preparation method thereof, aiming at the problems of poor catalytic activity, low strength and easy abrasion of the traditional single-component catalyst carrier.

A denitration catalyst carrier consists of 60-75 wt% of cordierite and 25-40 wt% of modifier.

The modifier consists of tetraethoxysilane and metal salt, wherein the mass ratio of the tetraethoxysilane to the metal salt is (40-50): (50-60).

Further, the metal salt includes two or more of aluminum salt, titanium salt, manganese salt, and cerium salt.

Further, the metal salt is composed of 0 to 50wt% of an aluminum salt, 0 to 50wt% of a titanium salt, 0 to 50wt% of a manganese salt and 0 to 50wt% of a cerium salt.

A preparation method of a denitration catalyst carrier comprises the following steps:

step 1: mixing two or three of aluminum salt, titanium salt, manganese salt and cerium salt according to the proportion of 0-50wt% of aluminum salt, 0-50wt% of titanium salt, 0-50wt% of manganese salt and 0-50wt% of cerium salt to obtain metal salt, adding the metal salt into ethanol with the mass of 3-4 times that of the metal salt, uniformly stirring, adding distilled water with the mass of 1.5-2 times that of the metal salt, and continuously stirring to obtain a first mixed solution;

step 2: dissolving tetraethoxysilane in ethanol with the mass 2-3 times that of tetraethoxysilane, adding the obtained solution into the first mixed solution, and uniformly stirring to obtain a second mixed solution;

and step 3: adding hydrochloric acid with the concentration of 20% and the mass of 1.5-2 times that of the ethyl orthosilicate into the second mixed solution, stirring for 6-8 hours, and heating at the constant temperature of 85-95 ℃ for 8-10 hours to obtain sol;

and 4, step 4: pickling cordierite with 35% hydrofluoric acid at normal temperature for 4-5 hours, washing with distilled water to be neutral, adding the mixture into the sol obtained in the step 3, and performing ball milling on the cordierite and the sol obtained in the step 3 according to the proportion of 60-75 wt% and 25-40 wt% to obtain gel after 7-8 hours;

and 5: and (3) calcining the gel obtained in the step (4) for 3-4 hours in the air atmosphere of 500-600 ℃, cooling and sieving to obtain the final product.

The invention modifies the surface of cordierite through a modifier, thereby improving the catalytic activity, mechanical strength and service life of the cordierite catalyst carrier. It is an object of the present invention to improve the performance of a single cordierite catalyst carrier by preparing a multi-component catalyst carrier.

Detailed description of the preferred embodiment

Example 1

A denitration catalyst carrier is prepared from the following raw materials in percentage by mass: 75% of cordierite and 25% of modifier;

the modifier comprises tetraethoxysilane and metal salt, wherein the metal salt comprises aluminum nitrate, titanium nitrate, manganese nitrate and cerium nitrate;

the mass ratio of the tetraethoxysilane to the metal salt is 50: 50;

the metal salt comprises the following components in percentage by mass: 25% of aluminum nitrate, 25% of titanium nitrate, 25% of manganese nitrate and 25% of cerium nitrate.

A denitration catalyst carrier and a preparation method thereof are disclosed, wherein the preparation method comprises the following steps:

mixing the aluminum nitrate, the titanium nitrate, the manganese nitrate and the cerium nitrate, adding the mixture into ethanol of which the amount is 3 times that of the mixture, uniformly stirring the mixture, adding distilled water of which the amount is 1.5 times that of the mixture, and continuously stirring the mixture to prepare a first mixed solution;

dissolving the tetraethoxysilane in 3 times of ethanol, adding the obtained solution into the first mixed solution, and uniformly stirring to obtain a second mixed solution;

adding dilute hydrochloric acid with the concentration of 20% and the mass of 2 times that of the ethyl orthosilicate into the second mixed solution, stirring for 8 hours, and then heating at the constant temperature of 95 ℃ for 10 hours to obtain sol;

pickling the cordierite with 35% hydrofluoric acid at normal temperature for 5 hours, washing the cordierite to be neutral by using distilled water, adding the cordierite into the sol, and putting the sol into a ball mill for ball milling for 8 hours to obtain gel;

and calcining the gel for 3 hours at 600 ℃ in an air atmosphere, cooling, and screening to obtain the denitration catalyst carrier.

Example 2

A denitration catalyst carrier is prepared from the following raw materials in percentage by mass: 70% of cordierite and 30% of modifier;

the modifier comprises tetraethoxysilane and metal salt, wherein the metal salt comprises aluminum nitrate, titanium nitrate, manganese nitrate and cerium nitrate;

the mass ratio of the tetraethoxysilane to the metal salt is 40: 60, adding a solvent to the mixture;

the metal salt comprises the following components in percentage by mass: 35% of aluminum nitrate, 35% of titanium nitrate, 15% of manganese nitrate and 15% of cerium nitrate.

A denitration catalyst carrier and a preparation method thereof are disclosed, wherein the preparation method comprises the following steps:

mixing the aluminum nitrate, the titanium nitrate, the manganese nitrate and the cerium nitrate, adding the mixture into ethanol of 4 times, uniformly stirring, adding distilled water of 2 times, and continuously stirring to obtain a first mixed solution;

dissolving the tetraethoxysilane in 2 times of ethanol, adding the obtained solution into the first mixed solution, and uniformly stirring to obtain a second mixed solution;

adding dilute hydrochloric acid with the concentration of 20% and the mass of 1.5 times that of the ethyl orthosilicate into the second mixed solution, stirring for 6 hours, and heating at the constant temperature of 85 ℃ for 8 hours to obtain sol;

pickling the cordierite with 35% hydrofluoric acid at normal temperature for 4 hours, washing the cordierite to be neutral by using distilled water, adding the cordierite into the sol, and putting the sol into a ball mill for ball milling for 7 hours to obtain gel;

and calcining the gel for 4 hours at 500 ℃ in an air atmosphere, cooling, and screening to obtain the denitration catalyst carrier.