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Preparation method of industrial waste gas purification catalyst

A technology for purifying catalysts and industrial waste gas, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as poor anti-poisoning and sintering performance, volatile active components, sintering and poisoning , to achieve the effect of improving anti-sintering performance, improving catalytic activity and improving reactivity

Active Publication Date: 2017-03-08
JIANGXI YUANYI INDAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supported noble metal (Pd, Pt, Ag, etc.) catalysts have good low-temperature activity, but they are expensive, and the active components are prone to volatilization, sintering and poisoning
The cost of transition metal oxide catalysts is low, and they are mainly used for catalytic oxidation at medium temperature, but their anti-poisoning and sintering properties are poor
Ordinary oxides and perovskite structure composite oxide catalysts also have the defect of easy sintering deactivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for preparing an industrial exhaust gas purification catalyst, characterized in that it comprises the following steps:

[0035] 1) Dissolving aluminum isopropoxide, strontium nitrate, and cerium nitrate in water to obtain a metal salt precursor solution with an Al concentration of 0.02mol / L, a Sr concentration of 0.01mol / L, and a Ce concentration of 0.01mol / L;

[0036] Add activated alumina, silicon nitride, and dispersant sodium polyacrylate to the metal salt precursor solution obtained in step 1), the addition of silicon nitride is 0.9 to 1.1 times the molar number of aluminum isopropoxide, and the addition of activated alumina The amount is 9.5 to 10.5 times the sum of the moles of Sr and Ce, and the amount of sodium polyacrylate as a dispersant is 0.1 to 1% of the mass of activated alumina and silicon nitride powder, stirred and mixed to form a suspension slurry;

[0037] 2) Coating the suspension slurry obtained in step 2) on the catalyst carrier to form a...

Embodiment 2

[0042]A method for preparing an industrial exhaust gas purification catalyst, characterized in that it comprises the following steps:

[0043] 1) Dissolving aluminum isopropoxide, manganese nitrate, and yttrium acetate in water to obtain a metal salt precursor solution with an Al concentration of 0.05mol / L, a Mn concentration of 0.02mol / L, and a Y concentration of 0.03mol / L;

[0044] 2) Add activated alumina, nano-silicon nitride, and sodium polycarboxylate as a dispersant to the metal salt precursor solution obtained in step 1), and the amount of silicon nitride added is 0.9 to 1.1 times the molar number of aluminum isopropoxide. The amount of alumina added is 9.5 to 10.5 times the sum of the moles of Mn and Y, the amount of sodium polycarboxylate added as a dispersant is 0.1 to 1% of the mass of activated alumina and nano silicon nitride powder, stirred and mixed to form suspension slurry;

[0045] 3) Coating the suspension slurry obtained in step 2) on the catalyst carrier...

Embodiment 3

[0050] A method for preparing an industrial exhaust gas purification catalyst, characterized in that it comprises the following steps:

[0051] 1) Dissolve aluminum isopropoxide, calcium nitrate, cobalt acetate, and lanthanum nitrate in water to obtain an Al concentration of 0.1mol / L, a Ca concentration of 0.02mol / L, a Co concentration of 0.04mol / L, and a La concentration of 0.04mol / L metal salt precursor solution;

[0052] 2) Add activated alumina, α-silicon nitride, dispersant naphthalene sulfonate anti-precipitation agent to the metal salt precursor solution obtained in step 1), and the addition of silicon nitride is 0.9 moles of aluminum isopropoxide ~1.1 times, the amount of activated alumina is 9.5 to 10.5 times the sum of the moles of Ca, Co, and La, and the amount of dispersant naphthalenesulfonate anti-precipitation agent is the mass of activated alumina and silicon nitride powder 0.1-1% of the content, stir and mix to form a suspension slurry;

[0053] 3) Coating ...

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Abstract

The invention provides a preparation method of an industrial waste gas purification catalyst. The preparation method can improve the sintering resistance and catalytic activity of the catalyst and comprises steps as follows: 1) one or more of aluminum isopropoxide, an alkaline-earth metal precursor, a rare-earth metal precursor and a transition metal precursor are dissolved in a solvent; 2) activated alumina, silicon nitride and a dispersant are added and mixed, and suspension slurry is formed; 3) a catalytic coating is formed by coating a catalyst carrier with the suspension slurry and dried; 4) the catalytic coating is placed in a flowing reductive atmosphere for roasting; 5) the catalyst coating is immersed in a precious metal solution for impregnation, dried and roasted at the roasting temperature of 400-700 DEG C, and a final product is formed.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of exhaust gas purification, in particular to an industrial exhaust gas purification catalyst and a preparation method thereof. [0003] 【Background technique】 [0004] As we all know, industrial exhaust gases (such as volatile organic compounds (VOCs), etc.) and vehicle exhaust gases (such as carbon monoxide, hydrocarbons, and nitrogen oxides, etc.) are the main sources of air pollutants. Motor vehicle exhaust has been basically purified due to the development and application of three-way catalysts, and VOCs have become one of the most important factors causing air pollution. Organic substances (such as low-carbon hydrocarbons, aromatic hydrocarbons, alcohols, ketones) emitted from industrial processes such as chemical industry, electronics industry, printing industry, paint and coatings, power plant boiler exhaust, as well as building materials, decoration materials, furniture adhesives, kitchen fumes, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/72B01D53/48
CPCB01D53/8603B01D53/8668B01D2257/306B01D2257/708B01J27/24B01J37/08B01J37/32
Inventor 唐剑彭树国
Owner JIANGXI YUANYI INDAL DEV
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