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Cerium-tin composite oxide denitration catalyst as well as preparation method and application 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 poor high temperature thermal stability, narrow temperature window, and easy sublimation and other problems, to achieve the effect of improving activity, strong synergistic catalytic effect, and improving water and sulfur resistance

Inactive Publication Date: 2018-02-02
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, for NH 3 - Most catalysts for SCR denitrification are V 2 o 5 -WO 3 / TiO 2 catalyst, but the catalyst has the following problems: the active component V 2 o 5 Toxic and easy to sublimate; narrow temperature window, usually has good catalytic performance in the range of 320-400 ° C; poor thermal stability at high temperature; and easy to produce greenhouse gas N under high temperature conditions 2 o

Method used

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  • Cerium-tin composite oxide denitration catalyst as well as preparation method and application thereof
  • Cerium-tin composite oxide denitration catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Ce 0.99 sn 0.01 o a Preparation of composite oxide catalyst

[0018] a) Take 39.6ml of 0.50mol / L cerium acetate solution and 4ml of 0.05mol / L tin tetrachloride solution respectively, stir and mix in a water bath at 30°C for 60 minutes to obtain a mixed solution;

[0019] b) Add ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 11, transfer the obtained mixed solution to a hydrothermal reaction kettle, perform a hydrothermal reaction at 150° C. for 12 hours, and then lower it to room temperature;

[0020] c) The reaction solution obtained in step b) was suction filtered, washed, dried at 120°C for 24 hours, and then calcined in a muffle furnace at 500°C for 4 hours to obtain Ce 0.99 sn 0.01 o a composite oxide catalyst.

Embodiment 2

[0021] Example 2: Ce 0.95 sn 0.05 o a Preparation of composite oxide catalyst

[0022] a) Take 19ml 1mol / L cerium nitrate solution, 10ml 0.1mol / L tin tetrachloride solution, 40℃ water

[0023] The bath was stirred and mixed for 60 minutes to obtain a mixed solution;

[0024] b) adding ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, and the obtained mixed solution

[0025] Transfer to a hydrothermal reaction kettle, hydrothermally react at 120°C for 24 hours, and then drop to room temperature;

[0026] c) The reaction solution obtained in step b) is suction filtered, washed, dried at 120°C for 12 hours, and then calcined in a muffle furnace at 500°C for 8 hours to obtain Ce 0.95 sn 0.05 o a composite oxide catalyst.

Embodiment 3

[0027] Example 3: Ce 0.9 sn 0.1 o a Preparation of composite oxide catalyst

[0028] a) Take 18ml 1mol / L cerium nitrate solution, 20ml 0.1mol / L tin tetrachloride solution, 30℃ water

[0029] The bath was stirred and mixed for 60 minutes to obtain a mixed solution;

[0030] b) adding ammonia water to the mixed solution obtained in step a) under constant stirring until the pH value is 10, and the obtained mixed solution

[0031] Transfer to a hydrothermal reaction kettle, hydrothermally react at 120°C for 48 hours, and then drop to room temperature;

[0032] c) The reaction solution obtained in step b) was suction filtered, washed, dried at 120°C for 24 hours, and then calcined in a muffle furnace at 500°C for 6 hours to obtain Ce 0.9 sn 0.1 o a composite oxide catalyst.

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Abstract

The invention provides a cerium-tin composite oxide denitration catalyst as well as a preparation method and application thereof. The catalyst has the following chemical composition of Ce<1-x>SnxOa, wherein x is greater than or equal to 0.01 but smaller than or equal to 0.1; a is determined by positive and negative valence electron balance. The composite oxide denitration catalyst is prepared by ahydro-thermal method; through the addition of the trace Sn, the obvious cooperated effect is achieved between Ce and Sn in the catalyst, so that the advantages of high denitration activity, strong water-resistant and sulfur-resistant performance and the like are realized. The prepared cerium and tin composite oxide denitration catalyst has the advantages that when the air speed is 12,8000h<-1>, in a range being 300 to 450 DEG C, the purification efficiency of nitrogen oxide (NOx) reaches 81 to 98 percent; the denitration catalyst can be used for purifying the NOx in the fixed source smoke gasand diesel engined car tail gas; wide application prospects are realized.

Description

technical field [0001] The invention relates to a cerium-tin composite oxide catalyst, a preparation method and an application thereof. The catalyst can be used to discharge NO from stationary sources and mobile sources such as diesel vehicles. x of elimination. Background technique [0002] As a typical haze-causing pollutant, nitrogen oxides have caused great harm to the ecological environment and human health. Therefore, NO x Emission control has become a research hotspot in the field of environmental catalysis and air pollution control technology. [0003] Ammonia selective catalytic reduction (Selective catalytic reduction, SCR) is to control NO x The mainstream technology of emission, its core technology is to develop efficient and stable denitrification catalyst. Currently, for NH 3 - Most catalysts for SCR denitrification are V 2 o 5 -WO 3 / TiO 2 catalyst, but the catalyst has the following problems: the active component V 2 o 5 Toxic and easy to sublimate;...

Claims

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Application Information

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IPC IPC(8): B01J23/14C01G19/02B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2251/2062B01J23/14C01G19/02
Inventor 刘志明冯旭王智华
Owner BEIJING UNIV OF CHEM TECH
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