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Manganese-based low-temperature denitration catalyst and preparation method thereof

A low-temperature denitration and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of human and environmental pollution, catalyst poisoning, high fly ash content, and achieve good sulfur resistance.

Active Publication Date: 2010-11-10
江苏中创清源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in the actual use of this technology. First, the high content of fly ash in the flue gas easily blocks the catalyst bed; second, the high content of sulfur in the flue gas easily poisons the catalyst; third, the active component V 2 o 5 The precursors of these compounds are generally very toxic and easily pollute the human body and the environment
However, if the low-temperature SCR technology is adopted, the SCR device is moved to after desulfurization, and a vanadium-free low-temperature SCR catalyst is used, the above problems will no longer exist

Method used

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  • Manganese-based low-temperature denitration catalyst and preparation method thereof
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  • Manganese-based low-temperature denitration catalyst and preparation method thereof

Examples

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Embodiment 1

[0015] A manganese-based low-temperature denitrification catalyst, the raw material components of which are: manganese nitrate with a content of 40% of the molar percentage of the catalyst, iron nitrate with a content of 5% of the molar percentage of the catalyst, and a content of 5% of the molar percentage of the catalyst 5% crystalline tin tetrachloride, the balance being cerium nitrate.

[0016] A method for preparing a manganese-based low-temperature denitration catalyst, comprising the following steps:

[0017] Step 1. Dissolve manganese nitrate, ferric nitrate, crystalline tin tetrachloride and cerium nitrate in 100 times molar water at room temperature, and stir to form a transparent solution, wherein the content of manganese nitrate is 40% of the molar percentage of the catalyst, and the content of ferric nitrate Ferric nitrate which is 5% of the molar percentage of the catalyst, the content of crystalline tin tetrachloride is 5% of the molar percentage of the catalyst...

Embodiment 2

[0024] A manganese-based low-temperature denitrification catalyst, the raw material components of which are: manganese nitrate with a content of 40% of the molar percentage of the catalyst, iron nitrate with a content of 6% of the molar percentage of the catalyst, and a content of 6% of the molar percentage of the catalyst 10% crystalline tin tetrachloride, the balance being cerium nitrate.

[0025] A method for preparing a manganese-based low-temperature denitration catalyst, comprising the following steps:

[0026] Step 1. Dissolve manganese nitrate, ferric nitrate, crystalline tin tetrachloride and cerium nitrate in water of 110 times molar weight at room temperature, and stir to form a transparent solution, wherein the content of manganese nitrate is 40% of the molar percentage of the catalyst, and the content of ferric nitrate Ferric nitrate which is 6% of the molar percentage of the catalyst, the content of crystalline tin tetrachloride is 10% of the molar percentage of ...

Embodiment 3

[0038] A manganese-based low-temperature denitrification catalyst, the raw material components of which are: manganese nitrate with a content of 40% of the molar percentage of the catalyst, iron nitrate with a content of 5% of the molar percentage of the catalyst, and a content of 5% of the molar percentage of the catalyst 20% crystalline tin tetrachloride, the balance being cerium nitrate.

[0039] A method for preparing a manganese-based low-temperature denitration catalyst, comprising the following steps:

[0040] Step 1. Dissolve manganese nitrate, ferric nitrate, crystalline tin tetrachloride and cerium nitrate in water of 115 times the molar weight at room temperature, and stir to form a transparent solution, wherein the content of manganese nitrate is 40% of the molar percentage of the catalyst, and the content of ferric nitrate Ferric nitrate which is 5% of the molar percentage of the catalyst, the content of crystalline tin tetrachloride is 20% of the molar percentage...

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Abstract

The invention relates to a manganese-based low-temperature denitration catalyst and a preparation method thereof. The preparation method comprises the following steps of: 1, dissolving manganous nitrate, ferric nitrate, crystal tin tetrachloride and cerous nitrate in water at normal temperature, and stirring the mixture to form transparent solution; 2, preparing solution of ammonium carbonate, dripping the solution of ammonium carbonate into the solution prepared by the step 1, and heating and stirring the mixture to obtain slurry; 3, ultrasonically immersing the slurry, leaching the slurry to obtain a filter cake, and then washing the filter cake with deionized water; and 4, drying and roasting the filter cake to obtain the manganese-based low-temperature denitration catalyst MnFeSnCeOx, wherein the molar ratio of Mn: Fe: Sn: Ce in the prepared catalyst is equal to (35-39):(2-5):(9-35):(54-21). The purification efficiency of nitric oxides reaches 71 to 100 percent when the metallic oxide catalyst is at the temperature of between 80 and 250 DEG C. The composite oxide catalyst has high sulfur resistance.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a method for treating NO in exhaust gas from thermal power plants, cement plants, steel plants, oil refineries, etc. X Manganese-based low-temperature denitrification catalyst and preparation method thereof. Background technique [0002] With the growth of coal-based energy consumption and the rapid increase of motor vehicle ownership, a large amount of fossil fuel consumption (stationary and mobile sources), resulting in the emission of nitrogen oxides (NOx) into the atmosphere X ) and other acid-causing substances continue to increase, causing great damage to the environment on which human beings depend. Therefore, how to effectively eliminate nitrogen oxides has become an important topic of concern in the field of environmental protection. [0003] Ammonia Selective Catalytic Reduction (SCR) has become a mainstream denitrification technology for stationary sourc...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/56
Inventor 李俊华常化振郝吉明
Owner 江苏中创清源科技有限公司
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