Preparation process of honeycomb SCR (selective catalytic reduction) denitration catalyst

A technology of denitrification catalyst and preparation process, which is applied in the field of preparation of honeycomb SCR denitrification catalyst, which can solve the problems of large temperature span, rapid heating of the catalyst, easy cracking, etc., and achieve the effect of high strength

Active Publication Date: 2013-01-16
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no humidity control during the drying process, and the extruded catalyst is directly dried at 80°C and is prone to cracking; in addition, th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Mixing. Weigh 328.6g titanium tungsten powder, 71.4g titanium silicon powder, 25.0g copper oxide, 147.0g manganese acetate, 36.0g cerium dioxide, 45.0g glass fiber, 3.6g pulp cotton, 50.0g glycerin, 40g distilled water, 4.2g carboxylate Sodium methylcellulose and 5.2g polyethylene oxide are uniformly mixed in a mixer, and the mixed blank is taken, and its moisture content is detected by HB43-S halogen moisture analyzer to be 15.3%, and its moisture content is detected by KS-B microcomputer plasticity analyzer. Plasticity is 225.

[0037] (2) Once stale. Put the billet into a sealed bag and place it in an aging warehouse for aging for 12 hours.

[0038] (3) Filtration pre-extrusion. Put the stale blank into the filter for mixing and filtering, and the filter screen is 10 mesh. After removing impurities, it enters the pre-extruder and extrudes into a cuboid block.

[0039] (4) Second stale. The above-mentioned block-shaped blank is sealed for the second aging, a...

Embodiment 2

[0047] (1) Mixing. Weigh 350.0g titanium-tungsten powder, 50.0g titanium-silicon powder, 50.0g copper oxide, 196.0g manganese acetate, 36.0g cerium dioxide, 40.0g glass fiber, 7.2g pulp cotton, 20.0g glycerin, 65g distilled water, 8.4g carboxylate Sodium methylcellulose and 5.2g polyethylene oxide are uniformly mixed in a mixer, and the mixed blank is taken, and its moisture content is detected by HB43-S halogen moisture analyzer to be 18.6%, and its moisture content is detected by KS-B type microcomputer plasticity analyzer. Plasticity is 197.

[0048] (2) Once stale. Put the billet into a sealed bag and place it in an aging warehouse for aging for 24 hours.

[0049] (3) Filtration pre-extrusion. Put the stale blank into the filter for mixing and filtering, and the filter screen is 4 mesh. After removing impurities, it enters the pre-extruder and extrudes into a cuboid block.

[0050] (4) Second stale. The above-mentioned block blank is sealed for the second aging, and ...

Embodiment 3

[0058] (1) Mixing. Weigh 375.0g titanium tungsten powder, 25.0g titanium silicon powder, 25.0g copper oxide, 245.0g manganese acetate, 18.0g cerium dioxide, 30.0g glass fiber, 3.6g pulp cotton, 10.0g glycerin, 80g distilled water, 4.2g carboxylate Sodium methylcellulose and 10.4g polyethylene oxide are uniformly mixed in a mixer, and the mixed blank is taken, and its moisture content is detected by HB43-S halogen moisture analyzer to be 24.1%, and its moisture content is detected by KS-B type microcomputer plasticity analyzer. Plasticity is 165.

[0059] (2) Once stale. Put the billet in a sealed bag and place it in an aging warehouse for aging for 8 hours.

[0060] (3) Filtration pre-extrusion. Put the stale blank into the filter for mixing and filtering, and the filter screen is 6 mesh. After removing impurities, it enters the pre-extruder and extrudes into a cuboid block.

[0061] (4) Second stale. The above-mentioned block-shaped blank is sealed for the second aging,...

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Abstract

The invention discloses a preparation process of a honeycomb SCR(selective catalytic reduction) denitration catalyst. The preparation process includes steps of (1), subjecting a mixture of raw materials which are mixed proportionally to primary decaying, filtering and pre-extruding the mixture, subjecting the mixture to secondary decaying and finally forming and extruding out a catalyst blank in vacuum; (2), subjecting the catalyst blank formed and extruded in vacuum to primary drying at a temperature ranging from 22-68 DEG C and a humidity ranging from 95-10% gradually; (3), subjecting the catalyst dried primarily to secondary drying at the temperature ranging from 60 DEG C to 105 DEG C within the drying period of 12-24 hours; (4), calcining the catalyst blank dried secondarily at the temperature ranging from 68 DEG C to 600 DEG C for 20-30 hours, and detecting finished products after calcining. The honeycomb SCR denitration catalyst is high in yield and high in strength, manufacturing cost of the catalyst is reduced, and mechanical performance of the catalyst is improved.

Description

technical field [0001] The invention relates to the technical field of denitration catalyst preparation, in particular to a preparation process of a honeycomb SCR denitration catalyst. Background technique [0002] Flue gas denitrification is currently a method commonly used by developed countries in the world to reduce NOx emissions, which can achieve high NOx removal efficiency. Among them, SCR and SNCR technologies are widely used, especially SCR technology, and the denitrification efficiency can reach 90%. above. SCR has hundreds of successful applications and decades of operating experience around the world. About 95% of flue gas denitrification devices in Japan and Germany use SCR technology. This method is mature in technology, high in denitrification rate, and has almost no secondary pollution. . [0003] The key to SCR denitrification technology is the catalyst, whose cost usually accounts for 30% to 40% of the initial investment. At present, most of the catalyst...

Claims

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Application Information

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IPC IPC(8): B01J35/04B01J37/08B01D53/90B01D53/56
Inventor 王瑞洋王岳军莫建松刘伟虞廷兴陈美秀
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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