High-efficiency denitration catalyst and preparation process thereof

A denitrification catalyst and catalyst technology, applied in the direction of heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of narrow reaction temperature window and poor low temperature activity , to achieve the effect of wide reaction temperature window, inhibition of agglomeration and good stability

Inactive Publication Date: 2017-01-11
王欧庭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commercially available V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 Although the catalyst is very mature, it still has a narrow reaction temperature window, poor activity at low temperature, and easy formation of N at high temperature. 2 O by-products and main active components V 2 o 5 Biological toxicity and other defects

Method used

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  • High-efficiency denitration catalyst and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dissolve corresponding amounts of cerium nitrate, bismuth nitrate, and aluminum nitrate in deionized water, stir at room temperature for 0.2h, then add hexadecyltrimethylammonium bromide, and continue stirring for 1.0h to fully Mix to form a mixed solution, wherein the concentration of cerium, bismuth, and aluminum in the mixed solution is 0.5mol / L, 0.5mol / L and 1.0mol / L respectively, and the addition of cetyltrimethylammonium bromide The amount is 5wt% of the total weight of cerium nitrate, bismuth nitrate and aluminum nitrate;

[0026] 2) Add urea 3 times the total weight of cerium nitrate, bismuth nitrate and aluminum nitrate to the mixed solution obtained in step 1), stir for 0.5h to make it fully mixed, then transfer to a hydrothermal reaction kettle and treat at 80°C for 6h Down to room temperature to obtain a mixture containing precipitation;

[0027] 3) Filter and wash the precipitate-containing mixture obtained in step 2) to obtain the precipitate, and add ...

Embodiment 2

[0031] 1) Dissolve the corresponding amount of cerium nitrate, bismuth acetate, and aluminum sulfate in deionized water, stir at room temperature for 2.0h, then add polyvinylpyrrolidone to it, continue stirring for 0.2h to fully mix to form a mixed solution, and mix The concentrations of cerium, bismuth and aluminum in the solution are 0.05mol / L, 0.05mol / L and 0.05mol / L respectively, and the amount of cetyltrimethylammonium bromide is cerium nitrate, bismuth acetate , 2wt% of the total weight of aluminum sulfate;

[0032] 2) Add urea 5 times the total weight of cerium nitrate, bismuth acetate, and aluminum sulfate to the mixed solution obtained in step 1), stir it for 3 hours to make it fully mixed, then transfer it to a hydrothermal reaction kettle and treat it at 100°C for 4 hours, then drop to room temperature to obtain a mixture containing precipitation;

[0033] 3) Filter and wash the precipitate-containing mixture obtained in step 2) to obtain the precipitate, and add a...

Embodiment 3

[0037] 1) Dissolve the corresponding amount of ammonium cerium nitrate, bismuth acetate, and aluminum chloride in deionized water, stir at room temperature for 0.5h, then add polyvinylpyrrolidone to it, continue stirring for 0.5h to fully mix to form a mixed solution, Wherein the amount concentration of cerium, bismuth, aluminum three in the mixed solution is respectively 3mol / L, 3mol / L and 4mol / L, and the addition amount of cetyltrimethylammonium bromide is cerium ammonium nitrate, bismuth acetate , 3wt% of the total weight of aluminum chloride;

[0038] 2) Add urea 4 times the total weight of ammonium cerium nitrate, bismuth acetate, and aluminum chloride to the mixed solution obtained in step 1), stir for 1 hour to make it fully mixed, and then transfer to a hydrothermal reaction kettle for 5 hours at 90°C After being down to room temperature to obtain the mixture containing precipitation;

[0039]3) Filter and wash the precipitate-containing mixture obtained in step 2) to...

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Abstract

The invention discloses a high-efficiency denitration catalyst and a preparation process thereof. The catalyst is a cerium bismuth aluminum composite oxide, wherein based on the molar ratio of metal elements, the molar ratio of cerium to aluminum is 0.1-1.0, and the molar ratio of bismuth to aluminum is 0.1-1.0. The catalyst is prepared by utilizing a treatment process of integrating a homogeneous co-precipitation method and a hydrothermal method, after-treatment is performed by utilizing the technical means of azeotropic distillation, and solid solution can be formed when the cerium and bismuth oxides are positioned in a highly dispersed state in the metal compound oxide. The high-efficiency denitration catalyst prepared by the invention can achieve excellent denitration activity, reaction stability, water resistance and sulfur tolerance in a temperature range of 200-400 DEG C.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis, and relates to a denitration catalyst, in particular to a cerium-bismuth-aluminum composite oxide denitration catalyst and a preparation process thereof. Background technique [0002] In recent years, with the rapid development of my country's industrialization process, it has contributed to the rapid development of the national economy and led to a gradual increase in pollutant emissions, of which NO x It is a common main pollutant in the atmosphere. It will not only cause harm to people's health, but also form acid rain, photochemical smog, etc., which will lead to the destruction of the ecological environment. NO x It is mainly produced by stationary sources represented by flue gas from coal-fired power plants and mobile sources represented by automobile exhaust. Since my country's coal-based energy structure will not change for a long period of time, NO in coal-fired flue ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01D53/86B01D53/56
CPCB01D53/8628B01D2255/2065B01D2255/2092B01D2255/2096B01D2258/0283B01J23/002B01J23/18B01J2523/00B01J2523/31B01J2523/3712B01J2523/54
Inventor 王欧庭
Owner 王欧庭
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