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Molecular sieve catalyst for medium and low temperature denitration and production method of molecular sieve catalyst

A technology for low-temperature denitration and production methods, applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve problems such as low denitration efficiency, and achieve high catalytic efficiency, good catalytic activity and diffusion performance, and strong anti-coking ability. Effect

Inactive Publication Date: 2019-04-26
PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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  • Abstract
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Problems solved by technology

[0004] In order to solve the current situation of low denitrification efficiency under medium and low temperature conditions, the present invention provides a Mn / USY molecular sieve catalyst for medium and low temperature denitrification and its production method. By using this method, Mn / USY catalysts with different manganese loadings can be obtained. Different denitrification efficiencies

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  • Molecular sieve catalyst for medium and low temperature denitration and production method of molecular sieve catalyst

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Effect test

Embodiment 1

[0018] A method for producing a molecular sieve catalyst for medium and low temperature denitrification, comprising the steps of:

[0019] (1) the corresponding metal salt manganese acetate powder of a certain amount of active component manganese is dissolved in water, stirs and obtains manganese acetate solution;

[0020] (2) Take a certain amount of USY molecular sieve and impregnate it in manganese acetate solution, stir it at room temperature for 2 hours, dry it in a water bath at 80°C, dry it in an oven at 110°C for 18 hours, and calcinate it in a muffle furnace at 550°C for 4 hours under a static atmosphere , after sieving through a 50 mesh square hole sieve, 6Mn / USY catalysts with different manganese contents were obtained, wherein the ratio of manganese acetate solution to USY molecular sieve was 6% manganese loading.

[0021] (3) The NO removal efficiency of 6Mn / USY catalyst was determined by continuous flow stationary reactor. The reaction was carried out in a quart...

Embodiment 2

[0023] A method for producing a molecular sieve catalyst for medium and low temperature denitrification, comprising the steps of:

[0024] (1) the corresponding metal salt manganese acetate powder of a certain amount of active component manganese is dissolved in water, stirs and obtains manganese acetate solution;

[0025] (2) Take a certain amount of USY molecular sieve and impregnate it in manganese acetate solution, stir it at room temperature for 2 hours, dry it in a water bath at 80°C, dry it in an oven at 110°C for 18 hours, and calcinate it in a muffle furnace at 550°C for 4 hours under a static atmosphere , after sieving through a 50 mesh square hole sieve, 8Mn / USY catalysts with different manganese contents were obtained, wherein the ratio of manganese acetate solution to USY molecular sieve was 8% manganese loading.

[0026] (3) The NO removal efficiency of 8Mn / USY catalyst was determined by continuous flow stationary reactor. The reaction was carried out in a quart...

Embodiment 3

[0028] A method for producing a molecular sieve catalyst for medium and low temperature denitrification, comprising the steps of:

[0029] (1) the corresponding metal salt manganese acetate powder of a certain amount of active component manganese is dissolved in water, stirs and obtains manganese acetate solution;

[0030] (2) Take a certain amount of USY molecular sieve and impregnate it in manganese acetate solution, stir it at room temperature for 2 hours, dry it in a water bath at 80°C, dry it in an oven at 110°C for 18 hours, and calcinate it in a muffle furnace at 550°C for 4 hours under a static atmosphere , 10Mn / USY catalysts with different manganese contents were obtained after sieving through a 50-mesh square hole sieve, wherein the ratio of manganese acetate solution to USY molecular sieve was 10% manganese loading.

[0031] (3) The NO removal efficiency of 10Mn / USY catalyst was determined by continuous flow stationary reactor. The reaction was carried out in a qua...

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Abstract

The invention provides a molecular sieve catalyst for medium and low temperature denitration. The molecular sieve catalyst is a loaded manganese base medium and low temperature Mn / USY catalyst and comprises a USY molecular sieve carrier and an active component manganese, wherein the loading capacity of the active component manganese is 5 to 15 percent; the USY molecular sieve carrier has a hollowstructure; in addition, a certain amount of amorphous silica is reserved at a hollow part of the hollow structure, so that the molecular sieve catalyst has good catalytic activity and diffusion capability and high coke formation resistance; besides, the invention further provides a production method of the molecular sieve catalyst for the medium and low temperature denitration; the Mn / USY catalystis obtained by impregnating a manganese acetate solution and a USY molecular sieve, drying, calcining and sieving. The production method of the molecular sieve catalyst is simple and convenient; Mn / USY catalysts with different manganese loading capacities can be produced by adjusting different manganese loading capacities of active components; by measurement of a continuous flow fixed reactor, the Mn / USY catalyst with 10 percent of manganese loading capacity has highest catalytic efficiency.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a molecular sieve catalyst for medium and low temperature denitrification and a production method thereof. Background technique [0002] Selective catalytic reduction (Selective Catalytic Reduction, SCR) is an effective method to remove nitrogen oxides from coal-fired coke oven flue gas. At present, the catalyst system that has realized commercial operation is V 2 o 5 -WO 3 / TiO 2 , the temperature window is 300-400°C. The catalytic system is often arranged at the outlet of the coal coke oven, so that the catalyst is exposed to the harsh flue gas environment with high dust and high sulfur, which reduces the catalytic efficiency and service life of the catalyst. In order to ensure a clean working environment for the catalyst, the SCR system needs to be placed after the flue gas desulfurization and dust removal process, and at this time the actual temperature of the flu...

Claims

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Application Information

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IPC IPC(8): B01J29/16B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J29/166B01J2229/186
Inventor 宁平王学谦王郎郎候建国李波李斌
Owner PINGXIANG HUAXING ENVIRONMENTAL PROTECTION ENG TECH CO LTD
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