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A manganese vanadium composite oxide catalyst for the selective catalytic reduction of nitrogen oxides by ammonia

A nitrogen oxide and catalyst technology, applied in the field of manganese vanadium composite oxide catalysts, can solve the problems of narrow temperature window, poor low temperature activity, low selectivity, etc., and achieve the effect of excellent N2 generation selectivity and wide operating temperature window

Active Publication Date: 2016-08-17
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] In order to solve the existing NH 3 -SCR catalyst system has poor low-temperature activity and high-temperature N 2 Due to the disadvantages of low selectivity and narrow temperature window, the purpose of the present invention is to provide a manganese vanadium composite oxide catalyst, which can be used as a fixed source flue gas denitrification NH 3 -SCR catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve manganese nitrate and ammonium metavanadate in water respectively, prepare a solution with a molar ratio of Mn / V of 2 and mix evenly, add excess ammonia solution to the solution, and continuously stir for 4 hours at 25°C, then perform suction filtration And wash 3 times to get the filter cake, put the filter cake in an oven and dry it at 100°C for 10h, and finally roast it in the air at 500°C in the muffle furnace for 5h to get the powdered catalyst. The prepared catalyst was pressed into tablets, crushed, sieved, and 20-40 meshes were taken for later use, which was called catalyst A.

Embodiment 2

[0030] Dissolve manganese nitrate and ammonium metavanadate in water respectively, prepare a solution with a molar ratio of Mn / V of 1 and mix evenly, add excess ammonia solution to the solution, and continuously stir for 4 hours at 25°C, then perform suction filtration And wash 3 times to get the filter cake, put the filter cake in an oven and dry it at 100°C for 10h, and finally roast it in the air at 500°C in the muffle furnace for 5h to get the powdered catalyst. The prepared catalyst was pressed into tablets, crushed, sieved, and 20-40 meshes were taken for later use, which was called catalyst B.

Embodiment 3

[0032] Dissolve manganese sulfate and ammonium metavanadate in water respectively, prepare a solution with a molar ratio of Mn / V of 5 and mix evenly, slowly add excess sodium hydroxide to the solution while stirring, then vacuum filter and wash 4 times to obtain the filtered solution. Cake, put the filter cake in an oven to dry at 80°C for 36 hours, and finally bake in air at 800°C for 3 hours in a muffle furnace to obtain a powdered catalyst. The prepared catalyst is pressed into tablets, ground, sieved, and 20-40 meshes are taken for later use.

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Abstract

The invention relates to a manganese vanadium composite oxide catalyst used for selective catalytic reduction of nitrogen oxides by ammonia. The invention prepares a composite oxide catalyst with the characteristics of high low-temperature catalytic activity, high nitrogen selectivity, and wide operating temperature window through a simple and easy method, and is suitable for nitrogen oxides in stationary source flue gas represented by coal-fired power plants purification treatment.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for selective catalytic reduction of nitrogen oxides by ammonia, in particular to a manganese vanadium composite oxide catalyst for catalytic purification of nitrogen oxides in stationary source flue gas. Background technique [0002] NO x The sources of NO are divided into natural sources and man-made sources, among which natural sources include NO produced by natural activities such as volcanic eruptions, forest fires, and lightning. x Anthropogenic sources include the combustion of fossil fuels such as coal and petroleum, and the production of NO from industrial processes such as nitric acid, nitrogen fertilizers and dyes. x . In anthropogenic sources NO x Among emissions, stationary source NO represented by flue gas from coal-fired power plants x accounts for about 60% of emissions. Therefore, for stationary sources of NO x Purification is extremely important. [0003] Stationa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01D53/90B01D53/56
Inventor 贺泓连志华刘福东石晓燕单文坡张长斌王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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