Honeycomb low-temperature denitration catalyst and preparation technology thereof

A low-temperature denitration and preparation process technology, applied in catalyst protection, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of poor mechanical strength, no molding, and low activation energy, and achieve high strength and resistance. The effect of alkali metal ability, increasing catalyst strength, and simple preparation process

Active Publication Date: 2019-01-18
JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The active components of the currently researched low-temperature SCR catalysts are mainly transition metals. Mn element has a variety of valence states, and the activation energy required for transition between valence states is low, so it has excellent denitrification performance at low temperature. The low-temperature denitrification catalyst active component, but its water resistance and sulfur resistance are poor, and whether manganese nitrate or manganese hydroxide is used in the production process, the product produced will burst due to the low decomposition temperature (200 ° C), and the mechanical strength is poor , leading to difficulty in forming honeycomb and high production cost
[0004] Patent CN 201610056551.9 discloses a honeycomb monolithic low-temperature denitration catalyst and its preparation process. It immerses transition metal (iron, cobalt, copper, nickel, manganese, cerium) salts into titanium dioxide to form a suspension, and then mixes it with other additives. The agent is made into a slurry, coated on a honeycomb cordierite carrier, and then dried and calcined to obtain a honeycomb monolithic low-temperature denitration catalyst. However, the active components of the low-temperature denitration catalyst are easily worn out in

Method used

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  • Honeycomb low-temperature denitration catalyst and preparation technology thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Grind 100 parts by weight of the spent SCR catalyst after washing and drying to a particle size d50 of 3-5 μm, and then put it into 350 parts by weight of an aqueous solution containing 4.35 parts by weight of cobalt nitrate, 9.1 parts by weight of cerium nitrate, and 69 parts by weight of manganese nitrate , beating at 80°C for 60 minutes, adding 22.8 parts by weight of ammonium carbonate to generate a precipitate, aging for 4 hours, filtering the precipitate and washing it twice with deionized water, and drying at 90°C for 4 hours;

[0033] 2) Mix the precipitate obtained in step 1) with 0.8 parts by weight of pseudoboehmite, 3 parts by weight of silica sol, 0.8 parts by weight of hydroxymethyl cellulose, 0.5 parts by weight of graphite and 80 parts by weight of deionized water to form a plastic clay ;

[0034] 3) The plastic mud obtained in step 2) is filtered for impurities, refined and stale;

[0035] 4) Vacuum extruding the sludge obtained in step 3) to obtain...

Embodiment 2

[0038] 1) Grind 100 parts by weight of the spent SCR catalyst after washing and drying to a particle size d50 of 3-5 μm, and then put it into 500 parts by weight of an aqueous solution containing 5.43 parts by weight of cobalt oxalate, 45.2 parts by weight of cerium oxalate, and 44.12 parts by weight of manganese oxalate , beating at 100°C for 30 minutes, adding 55.52 parts by weight of ammonium carbonate to generate a precipitate, aging for 6 hours, filtering the precipitate and washing it with deionized water 4 times, and drying at 110°C for 2 hours;

[0039] 2) Mix the precipitate obtained in step 1) with 1.5 parts by weight of pseudoboehmite, 5 parts by weight of silica sol, 1.2 parts by weight of hydroxymethylcellulose, 0.8 parts by weight of graphite and 100 parts by weight of deionized water to form a plastic mud ;

[0040] 3) The plastic mud obtained in step 2) is filtered for impurities, refined and stale;

[0041] 4) Vacuum extruding the sludge obtained in step 3) t...

Embodiment 3

[0044] 1) Grind 100 parts by weight of the spent SCR catalyst after washing and drying to a particle size d50 of 3-5 μm, and then put it into 400 parts by weight of an aqueous solution containing 5.07 parts by weight of cobalt acetate, 42.2 parts by weight of cerium acetate, and 27.5 parts by weight of manganese acetate , beating at 90°C for 45 minutes, adding 56.2 parts by weight of ammonium carbonate to form a precipitate, aging for 5 hours, filtering the precipitate and washing it with deionized water for 3 times, and drying at 100°C for 3 hours;

[0045]2) Mix the precipitate obtained in step 1) with 1 part by weight of pseudoboehmite, 4 parts by weight of silica sol, 1 part by weight of hydroxymethylcellulose, 0.7 parts by weight of graphite and 90 parts by weight of deionized water to form a plastic clay ;

[0046] 3) The plastic mud obtained in step 2) is filtered for impurities, refined and stale;

[0047] 4) Vacuum extruding the sludge obtained in step 3) to obtain a...

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PUM

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Abstract

The invention discloses a honeycomb low-temperature denitration catalyst and a preparation technology thereof. The catalyst is prepared by a simple preparation technology and is easy to mould; in addition, the prepared catalyst is high in low-temperature activity and strong in resistance to water, sulfur and alkali (earth) metal poisoning; furthermore, a waste SCR catalyst is used as a raw material, so that the cost is low, resource utilization of the waste SCR catalyst can be achieved, and recycling of the waste SCR catalyst can be achieved.

Description

technical field [0001] The invention relates to a honeycomb low-temperature denitrification catalyst and a preparation process thereof. Background technique [0002] In the field of nitrogen oxide pollution control, selective catalytic reduction (SCR, selective catalytic reduction) is the most widely used flue gas denitrification technology. SCR denitrification catalyst with NH 3 As a reducing agent, the harmful nitrogen oxides in the flue gas are reduced to harmless nitrogen by means of catalytic effect. At present, low-temperature denitration catalysts have become a hot research topic in the field of SCR catalysts. [0003] The active components of the currently researched low-temperature SCR catalysts are mainly transition metals. Mn element has a variety of valence states, and the activation energy required for transition between valence states is low, so it has excellent denitrification performance at low temperature. The low-temperature denitrification catalyst acti...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J33/00B01J35/04B01D53/56B01D53/86
CPCB01D53/8628B01J23/002B01J23/8892B01J33/00B01J35/04B01J2523/00B01J2523/3712B01J2523/845B01J2523/72Y02C20/30
Inventor 张涛祝建中陈晓利罗民华
Owner JIANGSU LONGKING COALOGIX CATALYST REGENERATION CO LTD
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