Honeycomb denitration catalyst for flue gas at 400 DEG C-600 DEG C and preparation method of honeycomb denitration catalyst

A technology of denitration catalyst and catalyst coating, which is applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc., can solve the deactivation of denitration catalyst and other problems, and achieve high loading capacity, high out-of-stock activity, and good tolerance Effect

Inactive Publication Date: 2015-11-04
TONGJI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deactivation phenomenon of existing denitration catalysts under high temperature conditions, the invention provides a honeycomb denitration catalyst for high temperature denitration and its preparation method

Method used

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  • Honeycomb denitration catalyst for flue gas at 400 DEG C-600 DEG C and preparation method of honeycomb denitration catalyst
  • Honeycomb denitration catalyst for flue gas at 400 DEG C-600 DEG C and preparation method of honeycomb denitration catalyst

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Experimental program
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Effect test

Embodiment 1

[0030] (1) 15% zeolite, 5% γ-alumina, 5% catalytic promoter, 5% binder and 70% deionized water by mass percentage, weigh 15g ZSM-5 type zeolite molecular sieve, 5g γ-alumina, 5g catalytic promoter (comprising ammonium molybdate, cerium nitrate, ferrous chloride, ammonium tungstate and chloroplatinic acid, wherein by molar ratio Mo:Ce:Fe:W:Pt=60:200:80:120:1) , 5g binding agent (iron nitrate) and 70g deionized water, fully stirred in a stirrer until uniform;

[0031] (2) The above-mentioned mixed solution is moved into a ball mill, and the coating slurry is obtained after sufficient ball milling, and the ball milling time is 24 hours;

[0032] (3) repeatedly immersing the honeycomb ceramics in the above-mentioned coating slurry, the immersion time is 5 minutes, and then blowing the excess coating slurry on the surface of the honeycomb ceramics by high-pressure air;

[0033] (4) Dry the coated honeycomb ceramics at 120°C for 12 hours, and then bake at 500°C for 5 hours to obtai...

Embodiment 2

[0036] (1) By mass percentage 25% zeolite, 10% γ-alumina, 10% catalytic aid, 5% binder and 50% deionized water, weigh 25g A-type zeolite molecular sieve, 10g γ-alumina, 10g catalytic Additives (including ammonium molybdate, cerium nitrate, ferrous chloride, ammonium tungstate, chloroplatinic acid and palladium nitrate, wherein the molar ratio Mo: Ce: Fe: W: Pt: Pd = 20: 160: 120: 140 : 1:1), 5g binder (cerium nitrate) and 50g deionized water, fully stir in a stirrer until uniform;

[0037] (2) The above-mentioned mixed solution is moved into a ball mill, and the coating slurry is obtained after sufficient ball milling, and the ball milling time is 36 hours;

[0038] (3) repeatedly immersing the honeycomb ceramics in the above-mentioned coating slurry, the immersion time is 10 minutes, and then blowing the excess coating slurry on the surface of the honeycomb ceramics by high-pressure air;

[0039] (4) Dry the coated honeycomb ceramics at 120°C for 12 hours, and then bake at 5...

Embodiment 3

[0042] (1) By mass percentage 20% zeolite, 7.5% γ-alumina, 7.5% catalytic aid, 5% binder and 60% deionized water, weigh 20g X-type zeolite molecular sieve, 7.5g γ-alumina, 7.5 g catalytic promoter (including ammonium molybdate, cerium nitrate, ferrous chloride, ammonium tungstate, chloroplatinic acid and palladium nitrate, wherein the molar ratio Mo: Ce: Fe: W: Pt: Pd = 60: 200: 160 : 160:1:1), 5g of binder (including cerium nitrate and ferric nitrate, wherein the molar ratio Ce:Fe=5:1) and 60g of deionized water are fully stirred in a stirrer until uniform;

[0043] (2) The above-mentioned mixed solution is moved into a ball mill, and the coating slurry is obtained after sufficient ball milling, and the ball milling time is 48 hours;

[0044] (3) repeatedly immersing the honeycomb ceramics in the above-mentioned coating slurry, the immersion time is 15 minutes, and then blowing the redundant coating slurry on the surface of the honeycomb ceramics by high-pressure air;

[004...

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Abstract

A honeycomb denitration catalyst for a flue gas at 400°C-600°C and a preparation method therefor. The honeycomb denitration catalyst comprises a catalyst coating and a honeycomb ceramic, wherein a slurry for the catalyst coating is made of components comprising the following mass percentages: 15%-25% of a zeolite, 5%-10% of γ-type alumina, 5%-10% of a catalyst auxiliary agent, 5% of a binder, and 50%-70% of deionized water. The honeycomb ceramic is dipped repeatedly into the above-mentioned slurry for the catalyst coating, and after the coating is completed, drying and calcining are performed to obtain the catalyst. The honeycomb denitration catalyst contains a catalytic auxiliary agent, and has excellent denitration activity at high temperature, sulphur-resistance and water-resistance, stability and NOX-removal property.

Description

technical field [0001] The invention belongs to the technical fields of environmental materials, environmental catalysis and environmental protection, and relates to a honeycomb denitrification catalyst suitable for flue gas at 400°C to 600°C discharged from coalbed methane power plants and the like and a preparation method thereof. Background technique [0002] The emission of nitrogen oxides has become one of the main causes of environmental pollution and has caused a series of environmental problems, such as photochemical smog, acid rain, ozone layer destruction and greenhouse effect. Selective catalytic reduction is currently one of the most effective methods for removing nitrogen oxides, and the choice of catalyst is very important. [0003] Many scholars at home and abroad have conducted in-depth and systematic research on catalyst systems, such as vanadium-titanium series, copper-manganese series, and so on. At present, most of the ammonia-selective SCR catalysts use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J29/78B01J29/16B01J37/02B01D53/86B01D53/56
CPCB01D53/56B01D53/86B01J29/16B01J29/18B01J29/78B01J37/02B01D53/8628B01D2255/2065B01D2255/20738B01D2255/20769B01D2255/20776B01D2255/2092B01D2255/50B01D2255/504B01D2258/0283B01J29/166B01J29/48B01J29/7807B01J37/0246B01D2255/1021B01D2255/1023B01J29/163B01J37/0009B01J37/0215B01J37/0236B01J37/04
Inventor 范建伟闵弘扬冉献强孙宇潘荣幸邹立寅姜序李丹丹陈旺源陈敏骏
Owner TONGJI UNIV
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