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Preparation method of denitration catalyst with nanoscale ordered honeycomb structure

A denitration catalyst, honeycomb structure technology, used in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc.

Active Publication Date: 2013-08-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, mesoporous materials have small pore size, the inner surface cannot be fully utilized in the process of air conduction, the mass transfer efficiency is not high, and the pores are easily blocked, which limits its practical application.

Method used

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  • Preparation method of denitration catalyst with nanoscale ordered honeycomb structure
  • Preparation method of denitration catalyst with nanoscale ordered honeycomb structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of catalyst: get styrene monomer and methacrylic acid, sodium bicarbonate and deionized water, after mixing with the mass ratio of 9:0.5:0.24:85, add the ammonium persulfate that massfraction is 0.3% in mixture as Initiator, under nitrogen protection, 85 o C, reacted under stirring conditions for 12h. The reaction products were subjected to evaporative self-assembly after centrifugal washing to prepare polystyrene templates. Cerium oxalate and zirconium silicate with a molar ratio of 8:2 are fully dissolved in a mixed solution of water, citric acid, and ethylene glycol with a mass ratio of 10:5:3, and then adsorbed by a polystyrene template and dried. The product was subsequently converted to 6 o C / min rate of heating up to 350 o C, calcined for 2 h, then heated to 750 o C, calcination for 5 h to obtain an ordered honeycomb framework of cerium-zirconium oxide. Disperse it with sodium tungstate at a mass ratio of 20:1 in deionized water, and evaporat...

Embodiment 2

[0029] The preparation of catalyst: get styrene monomer and methacrylic acid, after sodium bicarbonate and deionized water are mixed by the mass ratio of 10:1:0.24:85, add the ammonium persulfate that massfraction is 0.4% in the mixture as triggering agent, under nitrogen protection, 80 o C, reacted under stirring conditions for 10h. The reaction products were subjected to evaporative self-assembly after centrifugal washing to prepare polystyrene templates. Cerium carbonate and zirconium nitrate with a molar ratio of 7:3 were fully dissolved in a mixed solution of water, citric acid, and ethylene glycol with a mass ratio of 10:5:3, and then adsorbed by a polystyrene template and dried. The product was subsequently treated with 4 o C / min rate of heating up to 350 o C, calcined for 1.5 h, then heated to 650 o C, calcination for 4 h to obtain nanoscale ordered honeycomb framework of cerium-zirconium oxide. Disperse it and tungsten chloride in deionized water at a mass ratio ...

Embodiment 3

[0032] The preparation of catalyst: get styrene monomer and methacrylic acid, sodium bicarbonate and deionized water, after mixing by the mass ratio of 11:2:0.24:85, add the benzyl peroxide that massfraction is 0.5% in mixture Acyl as initiator, under nitrogen protection, 75 o C, reacted for 8h under stirring conditions. The reaction products were subjected to evaporative self-assembly after centrifugal washing to prepare polystyrene templates. Cerium nitrate and zirconium oxychloride with a molar ratio of 6:4 are fully dissolved in a mixed solution of water, citric acid, and ethylene glycol with a mass ratio of 10:5:3, and then adsorbed by a polystyrene template and dried. The product was subsequently treated with 2 o C / min rate of heating up to 350 o C, calcined for 2 h, then heated to 550 o C, performing a calcination treatment for 3 hours to obtain an ordered honeycomb framework of cerium-zirconium oxide. Disperse it and phosphotungstic acid in deionized water at a ma...

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Abstract

The invention relates to a preparation method of a denitration catalyst with a nanoscale ordered honeycomb structure cerium-zirconium oxide skeleton and dispersed tungsten oxide loaded on the surface, belonging to the technical field of preparation technologies of nanometer materials and environment protection. The preparation method is characterized by comprising the following steps of: depositing polrvinyl benzene microspheres into an ordered template, absorbing metal salt solution of cerium and zirconium under the condition that citric acid is taken as a complexing agent, calcining step by step to obtain the catalyst skeleton, and loading tungsten on the surface of the catalyst by means of impregnation and calcined activation to obtain the denitration catalyst with the characteristics. Due to the joint action of the structure and the surface load of the tungsten oxide, the catalyst is provided with a wide catalysis temperature window. Therefore, the catalyst provided by the invention can be used for selective catalytic reduction of nitric oxide in tail gas of a diesel engine and in smoke discharged out of a coal-fired power plant, a steel mill, etc.

Description

technical field [0001] The invention relates to a preparation method of a denitration catalyst with a nano-scale ordered honeycomb structure, which belongs to the technical field of nano-material preparation technology and environmental protection. Background technique [0002] Nitrogen oxides (NO x ) mainly to NO and NO 2 It is often found in the flue gas emitted by diesel engines and fossil fuel combustion. Because it can lead to the formation of acid rain and photochemical smog, which causes great damage to the living environment of human beings, it is regarded as a serious air pollutant. . At present, NO in flue gas and diesel engine exhaust produced by stationary sources such as thermal power plants and boiler combustion x The removal is mainly accomplished by two methods: dry method and wet method. The wet method includes several methods such as direct absorption method, oxidation absorption method and reduction absorption method, while the dry method includes catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/04B01D53/86B01D53/56
Inventor 张登松施利毅蔡思翔李红蕊黄垒张剑平
Owner SHANGHAI UNIV
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