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SCR (selective catalytic reduction) nitrogen oxide catalyst, and preparation method and application thereof

A nitrogen oxide and catalyst technology, applied in the field of manganese-based transition metal composite oxide catalysts, can solve the problems of poor low temperature activity, low selectivity, and narrow temperature window

Active Publication Date: 2012-11-07
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the existing NH 3 -SCR catalyst system has poor low-temperature activity and high-temperature N 2 Low selectivity, narrow temperature window and other shortcomings, the purpose of the present invention is to provide a catalyst for selective catalytic reduction of nitrogen oxides, the catalyst is a manganese-based composite oxide catalyst, which can be used as a fixed source flue gas denitrification NH 3 -SCR catalyst

Method used

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  • SCR (selective catalytic reduction) nitrogen oxide catalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0058] Dissolve manganese nitrate and niobium pentachloride in water respectively, prepare a solution with a molar ratio of Mn / Nb of 2 and mix evenly, add excess urea to the solution, and continuously stir at 90°C for 12h, then carry out suction filtration and Wash the filter cake three times to obtain the filter cake, put the filter cake in an oven and dry it at 100°C for 10 hours, and finally roast it in the air at 500°C in a muffle furnace for 5 hours to obtain a powder catalyst. The prepared catalyst was pressed into tablets, crushed, sieved, and 20-40 meshes were taken for later use, called catalyst A.

Embodiment 2

[0060] Dissolve manganese nitrate and niobium pentachloride in water respectively, prepare a solution with a molar ratio of Mn / Nb of 1 and mix evenly, add excess urea to the solution, and continuously stir at 90°C for 12 hours, then carry out suction filtration and Wash the filter cake three times to obtain the filter cake, put the filter cake in an oven and dry it at 100°C for 10 hours, and finally roast it in the air at 500°C in a muffle furnace for 5 hours to obtain a powder 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

[0062] Dissolve manganese sulfate, manganese nitrate and niobium pentachloride in water respectively, prepare a solution with a molar ratio of Mn / Nb of 4 and mix well, add excess urea to the solution, and stir continuously at 60°C for 48h, then carry out Suction filtration and washing once to obtain a filter cake, put the filter cake in an oven to dry at 105°C for 33 hours, and finally bake it in a muffle furnace at 380°C in air for 8 hours to obtain a powder catalyst. The prepared catalyst is pressed into tablets, crushed, sieved, and 20-40 meshes are taken for use to obtain a manganese-niobium composite oxide catalyst for selective catalytic reduction of nitrogen oxides.

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Abstract

The invention relates to an SCR (selective catalytic reduction) nitrogen oxide catalyst, and a preparation method and application thereof, belonging to the field of catalysis. The SCR nitrogen oxide catalyst is a composite oxide catalyst composed of manganese and at least one transition metal. The SCR nitrogen oxide catalyst is prepared from non-poisonous raw materials through a method which is simple and easy to operate, and has the advantages of wide operating temperature window, good low-temperature activity and excellent N2 generation selectivity. Thus, the catalyst is very suitable for the purification of nitrogen oxide in flue gas from coal-fired power plants representative of stationary sources.

Description

technical field [0001] The present invention relates to a catalyst, in particular to a transition metal composite oxide catalyst for the selective catalytic reduction of nitrogen oxides by ammonia, in particular to a manganese-based transition metal catalyst for the catalytic purification of nitrogen oxides in stationary source flue gas Composite oxide catalysts are used, for example, for the catalytic purification of nitrogen oxides in flue gas from coal-fired power plants. 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 repr...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/656B01J23/889B01D53/90B01D53/94B01D53/56
Inventor 贺泓连志华刘福东石晓燕单文坡王少莘
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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