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Cerium-tin-zirconium composite oxide catalyst, and preparation method and use thereof

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of reducing industrial production costs, disadvantages, and high prices. Achieve the effect of low cost, wide temperature window range and easy industrialization

Inactive Publication Date: 2016-06-15
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among the above-mentioned cerium tungsten zirconium catalysts, WO 3 The price is higher, which is not conducive to reducing the cost of industrial production

Method used

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  • Cerium-tin-zirconium composite oxide catalyst, and preparation method and use thereof
  • Cerium-tin-zirconium composite oxide catalyst, and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First dissolve cerium nitrate and zirconium nitrate completely in deionized water, then slowly add quantitative SnCl 4 and urea, wherein the molar ratio of urea to total metal ions is 10:1, and finally deionized water is added to the above mixed solution to a total volume of 250ml, and continuously stirred for 12h in a water bath at 90°C. After the above mixed solution is cooled to room temperature, the obtained precipitate is fully suction-filtered and washed to neutral with deionized water, then dried in an oven at 100°C overnight, and finally roasted at 500°C for 3 hours to obtain cerium tin-zirconium Composite oxide catalyst having the following chemical composition: CeSn a Zr 2 o x , a is 0.5.

Embodiment 2

[0042] Other conditions are the same as embodiment 1, except that adding control catalyst by raw material is composed of: CeSn a Zr 2 o x , a is 1.0.

Embodiment 3

[0044] Other conditions are the same as embodiment 1, except that adding control catalyst by raw material is composed of: CeSn a Zr 2 o x , a is 1.5.

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Abstract

The invention relates to a cerium-tin-zirconium composite oxide catalyst, a preparation method and an application thereof. The catalyst has the following chemical composition: CeSn a Zr 2 o x , a ranges from 0 to 2.0 and does not include 0. The addition of Sn promotes the synergy between Sn, Ce, and Zr, changes the adsorption performance of the catalyst to the reactants, and makes the redox process of the catalyst easier to complete, thereby increasing the NO x removal efficiency. The CeSn a Zr 2 o x The catalyst activity is significantly improved, and the temperature window is also significantly widened. The cerium-tin-zirconium composite oxide catalyst has excellent NH 3 - SCR activity.

Description

technical field [0001] The invention relates to a catalyst, in particular to a cerium-tin-zirconium composite oxide catalyst for catalytic purification of nitrogen oxides, a preparation method and application thereof. Background technique [0002] NH 3 -SCR technology, namely NH 3 The selective catalytic reduction of NO as a reducing agent is widely used in the removal of NO from mobile or stationary sources. The currently commercialized SCR catalyst is V 2 o 5 -WO 3 (MoO 3 ) / TiO 2 , but the system still has the following problems, such as poor activity at low temperature, low thermal stability, active component V at high temperature 2 o 5 Easily volatile and biologically toxic. Therefore, the development of a practical, efficient and environmentally friendly catalyst is used to remove NO emitted by diesel vehicles or coal-fired power plants x It is of great significance to protect our country's atmospheric environment. At present, the most researched SCR catalyst...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01D53/90B01D53/56
CPCB01J23/002B01D53/8628B01D53/90B01D2255/2065B01D2255/20715B01D2255/2094B01D2257/40B01D2257/404B01J23/14B01J2523/00
Inventor 贺泓丁世鹏刘福东石晓燕连志华牛璨谢利娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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