Cerium oxide catalyst for catalyzing and purifying nitric oxides, preparation method and application

A technology of cerium-based oxides and catalysts, which is 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 light rare earth element backlog and achieve good resistance The effects of water resistance to sulfur and thermal stability, excellent catalytic performance, and wide operating temperature window

Inactive Publication Date: 2016-01-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For existing NH 3 -The deficiency that SCR catalyst exists, and the problem of a large amount of backlog of light rare earth element Ce, the present invention provides a kind of CeO for the first time x The metal oxide catalyst formed by uniform dispersion on the surface of zirconium (Zr) titanium (Ti) composite oxide and its preparation method can be used as a mobile source represented by diesel vehicle exhaust and a fixed source represented by flue gas of coal-fired power plants. Source NO x Catalytic purification, especially suitable for NO in diesel vehicle exhaust x Catalytic purification

Method used

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  • Cerium oxide catalyst for catalyzing and purifying nitric oxides, preparation method and application
  • Cerium oxide catalyst for catalyzing and purifying nitric oxides, preparation method and application
  • Cerium oxide catalyst for catalyzing and purifying nitric oxides, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] According to the Ce:Zr molar ratio of 2:1, prepare a mixed solution of cerium nitrate and zirconium nitrate, then add urea, control the pH value of the mixed solution after all the dissolution is 1.5, then heat to 80-90°C and continue stirring for 12h, the pH rises As high as 7.5, then filtered and washed, put the obtained solid in an oven and dry at 100-110°C for 12 hours, and finally roasted in air at 500°C in a muffle furnace for 5 hours to obtain a powder catalyst, called catalyst A.

Embodiment 2

[0040] According to the molar ratio of cerium, zirconium and titanium being 2:1:4, dissolve titanium sulfate in deionized water, then add cerium nitrate and zirconium nitrate, and add urea as a precipitating agent, and control the pH value of the mixed solution after all dissolution is 1.0, then heated to 80-90°C and continuously stirred for 12 hours, the pH increased to 7.0, then filtered and washed, the resulting solids were dried in an oven at 100-110°C for 12 hours, and finally passed through a muffle furnace at 500 °C in air for 5 h to obtain a powder catalyst, called catalyst B.

Embodiment 3

[0042] Other conditions were unchanged as in Example 2, and the molar ratio of cerium, zirconium, and titanium was changed to 2:1:2 to obtain catalyst C.

[0043] Example 3

[0044] Other conditions were unchanged as in Example 2, and the molar ratio of cerium, zirconium, and titanium was changed to 2:1:10 to obtain catalyst D.

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Abstract

The invention discloses a cerium oxide catalyst for catalyzing and purifying nitric oxides, a preparation method and an application, wherein the cerium oxide catalyst for catalyzing and purifying the nitric oxides is a metal oxide catalyst CeOx@ZrO2-TiO2, cerium oxides (CeOx) are uniformly dispersed on the surfaces of composite titanium-zirconium oxides (ZrO2-TiO2). The cerium oxide catalyst for catalyzing and purifying the nitric oxides uses non-toxic harmless raw materials, is prepared through a simple and easy method, has the characteristics of excellent catalytic activity, high N2 generation selective and wide operation temperature window and the like, can be suitable for mobile sources using diesel exhausts as representatives and nitrogen oxide catalytic purification devices of fixed sources using coal burning power plant flue gas as representatives.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and application thereof, in particular to a cerium-based oxide catalyst for catalytic purification of nitrogen oxides, a preparation method and application thereof. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 ) can cause major environmental problems such as haze, photochemical smog, and acid rain, and can cause direct harm to human health. Therefore, controlling NO x The emission of pollutants is an important issue that needs to be solved urgently in the field of environmental protection. [0003] In recent years, much research has been devoted to NO x Development and application of emission control technologies. Among them, NH 3 Selective Catalytic Reduction of NO x (i.e. NH 3 -SCR) technology has been widely used in stationary sources such as coal-fired power plants since the 1970s x Catalytic elimination, and introduced into diesel vehicle ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/56B01D53/92B01D53/86
Inventor 单文坡耿阳胡晓黄楠丁鸿羽廖勇熊尚超党皓杨士建
Owner NANJING UNIV OF SCI & TECH
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