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Aluminum oxide-loaded cerium oxide catalyst and preparation method and application thereof

An alumina-supported, cerium oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve good thermal stability, good oxygen storage and oxygen release Ability, high chemical activity effect

Inactive Publication Date: 2013-01-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As for the application of supported cerium oxide catalysts to the NH of catalyzed hydroxides 3 -SCR reaction has not been reported in the literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]An alumina-supported ceria catalyst, calculated by mass percentage, that is, the ratio of alumina: ceria is 85:15.

[0032] The preparation method of above-mentioned a kind of alumina-supported cerium oxide catalyst is prepared by equal volume impregnation method, and the steps are as follows:

[0033] Two parts of 0.85g gamma alumina were respectively impregnated in the prepared 0.15g cerium nitrate and 0.15g cerium acetate solutions, respectively, and were stirred with polytetrafluoroethylene stirring paddles at 50°C, and the stirring speed was controlled at 200rpm during the stirring process, and the time 1h, then dried at 110°C for 12h, and then respectively in 300ml / min N 2 atmosphere, 600 ° C in a tube furnace for 5 h, and then cooled to room temperature to obtain CeO 2 Alumina-supported ceria catalysts A and B with a loading of 15%.

Embodiment 2

[0035] An alumina-supported ceria catalyst, calculated by mass percentage, that is, the ratio of alumina: ceria is 85:15.

[0036] The above-mentioned preparation method of alumina-supported cerium oxide catalyst is prepared according to the co-precipitation method, and the steps are as follows:

[0037] Dissolve 0.15g of cerium nitrate and 0.15g of cerium acetate and 6.255g of aluminum nitrate in deionized water, stir and dissolve at room temperature with a polytetrafluoroethylene stirring paddle at a rate of 200rpm, and then add 3mol / L ammonia water to adjust the pH was 11, after stirring for 3 hours, the precipitate was filtered and rinsed with deionized water;

[0038] Then the obtained precipitates were dried at 100°C for 12h, and then respectively heated under 1L / min of N 2 atmosphere, 600 ° C in a tube furnace for 5 h, and then cooled to room temperature to obtain CeO 2 Alumina-supported ceria catalysts C and D with a loading of 15%.

Embodiment 3

[0040] An alumina-supported ceria catalyst, calculated by mass percentage, that is, the ratio of alumina: ceria is 85:15.

[0041] The preparation method of above-mentioned a kind of alumina-supported cerium oxide catalyst is prepared by sol-gel method, and the steps are as follows:

[0042] Weigh 3.405g of aluminum isopropoxide and 0.15g of cerium nitrate and 0.15g of cerium acetate respectively to prepare a solution, use a polytetrafluoroethylene stirring paddle at room temperature, control the stirring rate to 200rpm, and add 1.2ml of 0.1 The nitric acid of mol / L is used as peptizing agent, makes sol;

[0043] Then the obtained sol was dried at 80° C. for 12 hours to obtain a xerogel, and finally the prepared xerogel was dried under 300 ml / min of N 2 atmosphere, 600 ° C in a tube furnace for 5 h, and then cooled to room temperature to obtain CeO 2 Alumina-supported ceria catalysts E and F with a loading of 15%.

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Abstract

The invention discloses an aluminum oxide-loaded cerium oxide catalyst and a preparation method and application thereof. Calculated by mass ratio, the mass ratio of aluminum oxide to cerium oxide in the aluminum oxide-loaded cerium oxide catalyst is 85:15. The preparation method for the aluminum oxide-loaded cerium oxide catalyst is characterized in that by adopting an equivalent-volume impregnation method, a coprecipitation method or a sol-gel method, the finally obtained aluminum oxide-loaded cerium oxide catalyst is higher in denitration activity at the lower reaction temperature of 200 DEG C when being used in a selective catalytic reduction flue gas denitration process, and the denitration efficiency can reach at least 90 percent, and thereby, the abuse that the reaction temperature of a traditional catalyst is high is overcome.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification catalysts, in particular to an alumina-supported cerium oxide catalyst and a preparation method and application thereof. Background technique [0002] Nitrogen oxide NO x It is one of the main air pollutants recognized by countries all over the world. It destroys the ozone layer, forms acid rain and photochemical smog, affects the ecological environment, and endangers human health. At present, the reduction of nitrogen oxides has attracted great attention. my country is a developing country that mainly burns coal, and the nitrogen oxides emitted by coal burning are the main man-made sources of nitrogen oxide environmental pollution. In 2009, the total emission of nitrogen oxides from thermal power plants in my country reached 18.6 million tons. The rapid development of my country's national economy has led to a rapid increase in the installed capacity of coal-fired power generat...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/90B01D53/56
Inventor 潘卫国周曰郭瑞堂徐宏建于月良何明福闻雪平
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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