Low-temperature denitration catalyst as well as preparation method and application thereof

A low-temperature denitrification and catalyst technology, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of limited industrial application and large bed pressure drop, and achieve low preparation cost, not easy to peel off, and preparation The effect of simple process

Inactive Publication Date: 2014-07-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the catalysts studied at present are mainly powder or particles, although they show good catalytic activity under experimental conditions, the industrial application of this catalyst is limited due to factors such as large bed pressure drop.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put the cut cordierite into 25wt% ammonia water, soak it at room temperature for 1 hour, wash it with water until neutral, place it at room temperature for 2 hours, dry it at 110°C for 6 hours, roast it at 400°C for 3 hours, and weigh it for later use after cooling. Mix a certain amount of butyl titanate and ethanol uniformly under rapid stirring for 1 hour, then slowly add a certain amount of mixed solution of ethanol, glacial acetic acid, hydrochloric acid and water that has been mixed uniformly, continue stirring for 1 hour, and then stand at room temperature for 4 hours. A transparent sol was obtained. Wherein, the volume ratio of the above-mentioned substances is, butyl titanate: ethanol: water: glacial acetic acid: hydrochloric acid = 1: 3.2: 0.1: 0.1: 0.05, the amount of ethanol used for the first time and the amount of ethanol used for the second time are both the total amount of ethanol 1 / 2. Immerse the pretreated cordierite honeycomb ceramic carrier in the pr...

Embodiment 2

[0028]Put the cut cordierite into 25wt% ammonia water, soak at room temperature for 2 hours, wash with water until neutral, place at room temperature for 3 hours, dry at 120°C for 8 hours, roast at 500°C for 4 hours, and weigh after cooling for later use. Mix a certain amount of butyl titanate and ethanol uniformly under rapid stirring for 2 hours, then slowly add a certain amount of mixed solution of ethanol, glacial acetic acid, hydrochloric acid and water that has been uniformly mixed, continue to stir for 2 hours, and then stand at room temperature for 6 hours. A transparent sol was obtained. Wherein, the volume ratio of the above-mentioned substances is, butyl titanate: ethanol: water: glacial acetic acid: hydrochloric acid = 1: 4: 0.15: 0.2: 0.1, the amount of ethanol for the first time and the amount of ethanol for the second time are both the total amount of ethanol 1 / 2. Immerse the pretreated cordierite honeycomb ceramic carrier in the prepared sol, take it out after...

Embodiment 3

[0030] Put the cut cordierite into 25wt% ammonia water, soak it at room temperature for 3 hours, wash it with water until neutral, place it at room temperature for 4 hours, dry it at 130°C for 10 hours, roast it at 600°C for 5 hours, and weigh it for later use after cooling. Mix a certain amount of butyl titanate and ethanol uniformly under rapid stirring for 3 hours, then slowly add a certain amount of mixed solution of ethanol, glacial acetic acid, hydrochloric acid and water that has been uniformly mixed, continue stirring for 3 hours, and then stand at room temperature for 8 hours. A transparent sol was obtained. Wherein, the volume ratio of the above-mentioned substances is, butyl titanate: ethanol: water: glacial acetic acid: hydrochloric acid = 1: 5: 0.2: 0.3: 0.2, the amount of ethanol for the first time and the amount of ethanol for the second time are both the total amount of ethanol 1 / 2. Immerse the pretreated cordierite honeycomb ceramic carrier in the prepared so...

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PUM

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Abstract

The invention discloses a low-temperature denitration catalyst as well as a preparation method and application thereof. Cordierite honeycomb ceramics are taken as a first carrier of the low-temperature denitration catalyst, and activated titanium dioxide is taken as a second carrier, and the activated components of manganite and auxiliary cerium oxide are loaded. The catalyst comprises the following composition in percentage by weight: TiO2 accounts for 1.7-15.0% of the cordierite honeycomb ceramic carrier, and manganese cerium oxide accounts for 0.64-2.00% of the cordierite honeycomb ceramic carrier, wherein the mass ratio of cerium oxide to manganese oxide is (0-2.1):1. The low-temperature denitration catalyst has the advantages of simple preparation technology, low cost, high low-temperature activity and large-scale industrialization.

Description

[0001] Field [0002] The invention relates to a low-temperature removal of flue gas NO x Catalysts and preparation methods and applications. Background technique [0003] Nitrogen oxides (NO x ) cause acid rain and photochemical smog, and make an outstanding contribution to PM2.5, which is one of the main air pollutants. Especially nitrogen oxides (NOx) emitted from stationary sources x ) accounts for more than 60%, so it must be controlled before its discharge. At present, ammonia selective catalytic reduction technology (NH 3 -SCR) is considered to be one of the most effective technologies, and the SCR catalysts for industrial applications are mainly V 2 o 5 -WO 3 / TiO 2 Catalyst, which has high denitrification activity, but the reaction temperature must be operated between 330 and 400 °C. For this reason, it is generally necessary to install the SCR device after the boiler economizer and before the air preheater. At this time, since the flue gas has not been dedus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/56
Inventor 黄长根刘建东侯亚芹韩小金李哲李凯
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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