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Integrated honeycomb SCR (selective catalytic reduction) catalyst for low-temperature smoke denitration and preparation method of catalyst

A honeycomb catalyst and low-temperature flue gas technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reduced catalytic activity, no investigation, activity discount, etc., and achieve good low-temperature activity and water resistance The effect of performance improvement

Active Publication Date: 2012-12-19
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the application number 200910145015.6 loads manganese oxide on the surface of attapulgite, and adds appropriate amount of Fe, Cu, and Ni as additives. The prepared powder catalyst has a NO removal rate of 95% at 200°C, and the reaction temperature is too high And did not consider the impact of water vapor and sulfur in the flue gas
The invention patent with the application number 201010272038.6 has prepared a honeycomb Mn-Ti based catalyst by extrusion molding and impregnation process, which has a high removal rate of nitrogen oxides at around 100°C, but there is no water vapor in the reaction simulation gas. The activity in the application will be greatly reduced
Panagiotis G.Smirniotis investigated different carriers (TiO 2 、Al 2 o 3 , SiO 2 ) supports the activity of the manganese-based catalyst, and the flue gas composition is NO=NH 3 =2000ppm, O 2 =2.0vol%, GHSV=8000h -1 , the NO removal rate of the catalyst can reach up to 80% at 80°C, and the NO removal rate can reach up to 100% at 100°C. The low-temperature activity is excellent, but the influence of water vapor is also not investigated, and the catalytic activity will be affected by water vapor in the actual application process.

Method used

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  • Integrated honeycomb SCR (selective catalytic reduction) catalyst for low-temperature smoke denitration and preparation method of catalyst
  • Integrated honeycomb SCR (selective catalytic reduction) catalyst for low-temperature smoke denitration and preparation method of catalyst
  • Integrated honeycomb SCR (selective catalytic reduction) catalyst for low-temperature smoke denitration and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Preparation of monolithic honeycomb catalyst for SCR flue gas denitrification

[0044] (1) Dry mix. Take 640gTiO 2 Powder, 225gFeC 2 o4 2H 2 O, 338gMn(CH 3 COO) 2 4H 2 O, 76gCe(NO 3 ) 3 ·6H 2 O, 384gZr(NO 3 ) 4 ·5H 2 O. 96g glass fiber, 64g carboxymethyl cellulose, 64g pseudo-boehmite, 32g activated carbon, put various solids together in a dry powder mixer and mix for 15 minutes.

[0045] (2) Kneading. 128ml of water and 128ml of glycerin were added to the above mixed material, and the kneading process was started for 30 minutes.

[0046] (3) Practicing mud. Pass the kneaded plastic material through a sieve plate or transfer it to a vacuum mud mixer to remove excess water and gas in the material.

[0047] (4) extrusion molding. The dense and uniform mud segment obtained after mud refining enters the extruder, and is extruded through a honeycomb steel die to obtain a catalyst green body.

[0048] (5) drying and roasting. Dry at 60°C for 10 hours, rai...

Embodiment 2

[0054] 1. Preparation of monolithic honeycomb catalyst for SCR flue gas denitrification

[0055] (1) Dry mix. Take 210gTiO 2 Powder, 430gZSM-5 (Si / Al=347), 180gFeC 2 o 4 2H 2 O, 394gMn(CH 3 COO) 2 4H 2 O, 76gCe(NO 3 ) 3 ·6H 2 O, 384gZr(NO 3 ) 4 ·5H 2 O, 96g glass fiber, 64g sodium carboxymethyl cellulose, 64g pseudo-boehmite, 64g gac. Put various solids together in a dry powder mixer and mix for 15 minutes.

[0056] (2) Kneading. 96ml of water and 128ml of glycerin were added to the above mixed material, and the kneading process was started for 20 minutes.

[0057] (3) Practicing mud. Pass the kneaded plastic material through a sieve plate or transfer it to a vacuum mud mixer to remove excess water and gas in the material.

[0058] (4) extrusion molding. The dense and uniform mud segment obtained after mud refining enters the extruder, and is extruded through a honeycomb steel die to obtain a catalyst green body.

[0059] (5) drying and roasting. Dry at 70°...

Embodiment 3

[0065] 1. Preparation of monolithic honeycomb catalyst for SCR flue gas denitrification

[0066] (1) Dry mix. Take 430g TiO 2 Powder, 210g ZSM-5 (Si / Al=347), 225gFeC 2 o 4 2H 2 O, 338gMn(CH 3 COO) 2 4H 2 O, 76gCe(NO 3 ) 3 ·6H 2 O, 384gZr(NO 3 ) 4 ·5H 2 O, 64g glass fiber, 64g sodium carboxymethyl cellulose, 64g pseudo-boehmite, 64g gac. Put various solids together in a dry powder mixer and mix for 15 minutes.

[0067] (2) Kneading. 160ml of water and 128ml of glycerin were added to the above mixture, and the kneading process was started for 30 minutes.

[0068] (3) Practicing mud. Pass the kneaded plastic material through a sieve plate or transfer it to a vacuum mud mixer to remove excess water and gas in the material.

[0069] (4) extrusion molding. The dense and uniform mud segment obtained after mud refining enters the extruder, and is extruded through a honeycomb steel die to obtain a catalyst green body.

[0070] (5) drying and roasting. Dry at 70°C fo...

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Abstract

The invention discloses an integrated honeycomb SCR (selective catalytic reduction) catalyst for low-temperature smoke denitration and a preparation method of the catalyst, wherein the integrated honeycomb SCR catalyst comprises substrates, active elements and additives; the substrates are TiO2 and ZSM-5 molecular sieve powder; the active elements comprise ZrO2, MnO2, Fe2O3 and CeO2. The catalyst provided by the invention not only has higher catalytic activity at a low temperature (120 DEG C), but also has a good waterproof property and a higher practical application value in engineering.

Description

technical field [0001] The invention relates to the preparation technology of a monolithic honeycomb catalyst, in particular to an SCR monolithic honeycomb catalyst used for low-temperature flue gas denitrification and a preparation method thereof. Background technique [0002] Nitrogen oxides (NOx) are the main pollutants that form acid rain, photochemical smog, destroy the ozone layer, affect the ecological environment and global warming. In 2011, my country's nitrogen oxide emissions were 24.04 million tons, an increase of 5.73% compared with 2010. The emissions rose instead of falling, and nitrogen oxide control is imperative. [0003] SCR and SNCR are flue gas denitration technologies that are widely used in engineering. Although SNCR denitrification technology has simple equipment and low engineering cost, its denitrification efficiency is low. SCR denitrification technology has the advantages of high denitrification efficiency and good selectivity, and is the mainstre...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J35/04B01D53/90B01D53/56
Inventor 王岳军刘伟莫建松王瑞洋刘学炎虞廷兴陈美秀
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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