SCR catalyst for purifying diesel engine exhaust pollutant and preparation method thereof

A technology for SCR catalysts and pollutants, which is applied in the field of diesel engine exhaust pollutant purification SCR catalysts and its preparation, can solve the problems of low particle removal efficiency, achieve the effects of easy operation, simple preparation method, and improved removal efficiency

Active Publication Date: 2016-05-11
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of low particulate matter removal efficiency of the existing diesel engine SCR catalyst, and to provide an SCR catalyst for efficient purification of diesel engine exhaust nitrogen oxides and particulate pollutants and a preparation method thereof

Method used

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  • SCR catalyst for purifying diesel engine exhaust pollutant and preparation method thereof
  • SCR catalyst for purifying diesel engine exhaust pollutant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The catalyst uses 300-mesh cordierite honeycomb ceramics as the carrier, and the size is 1 piece of cylinder with diameter 190.5mm*height 101.6mm (front stage) + 1 piece of cylinder with diameter 190.5mm*height 152.4mm (second stage), with a total volume of 7.22L . A catalytic coating is coated on the surface of the channel of the cordierite honeycomb ceramic carrier. The catalytic coating uses vanadium-cerium-manganese composite oxide as the active component; beta-type silicon-aluminum molecular sieve material as the auxiliary agent; titanium-tungsten-silicon composite oxide as the loading material. At the same time, silicon oxide is used as a binder to enhance the adhesion between the catalytic coating and the carrier.

[0029] The content of each component in the catalytic coating is calculated by mass ratio as active component: auxiliary agent: supporting material is 1:3:15. Among them, the mass ratio of each component in the active component is vanadium pentoxide...

Embodiment 2

[0037] The catalyst uses 300-mesh cordierite honeycomb ceramics as the carrier, and the size is 1 piece of cylinder with diameter 190.5mm*height 101.6mm (front stage) + 1 piece of cylinder with diameter 190.5mm*height 152.4mm (second stage), with a total volume of 7.22L . A catalytic coating is coated on the surface of the channel of the cordierite honeycomb ceramic carrier. The catalytic coating uses vanadium-cerium-manganese composite oxide as the active component; beta-type silicon-aluminum molecular sieve material as the auxiliary agent; titanium-tungsten-silicon composite oxide as the loading material. At the same time, silicon oxide is used as a binder to enhance the adhesion between the catalytic coating and the carrier.

[0038] The content of each component in the catalytic coating is calculated by mass ratio as active component: auxiliary agent: supporting material is 2:2:15. Among them, the mass ratio of each component in the active component is vanadium pentoxide...

Embodiment 3

[0046] The catalyst uses 300-mesh cordierite honeycomb ceramics as the carrier, and the size is 1 piece of cylinder with diameter 190.5mm*height 101.6mm (front stage) + 1 piece of cylinder with diameter 190.5mm*height 152.4mm (second stage), with a total volume of 7.22L . A catalytic coating is coated on the surface of the channel of the cordierite honeycomb ceramic carrier. The catalytic coating uses vanadium-cerium-manganese composite oxide as the active component; beta-type silicon-aluminum molecular sieve material as the auxiliary agent; titanium-tungsten-silicon composite oxide as the loading material. At the same time, silicon oxide is used as a binder to enhance the adhesion between the catalytic coating and the carrier.

[0047] The content of each component in the catalytic coating is calculated by mass ratio as active component: auxiliary agent: supporting material is 3:1:15. Among them, the mass ratio of each component in the active component is vanadium pentoxide...

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Abstract

The invention relates to an SCR catalyst for purifying diesel engine exhaust pollutant and a preparation method thereof. According to the catalyst, cordierite honeycomb ceramics are adopted as a carrier material, duct surfaces of the carrier are coated with a catalytic coating which is prepared by using vanadium-cerium-manganese compound oxide as an active ingredient, a silicone-aluminum molecular sieve material is used as an auxiliary, and a tungsten-titanium-silicon compound material is used as a supporting material. The method for preparing the catalyst comprises the following steps: firstly, preparing the supporting material and the active ingredient solution; then, mixing and soaking the active ingredient solution, the auxiliary and the supporting material to form catalytic coating powder; thirdly, mixing the coating powder, water and adhesive to form slurry; and finally, coating the carrier with the slurry to enable the coating amount to be 200-250g/L. The preparation method is simple, and the prepared catalyst can be used for effectively improving the efficiency for removing PM and NOx of diesel engine exhaust due to the high catalytic activity of the vanadium-cerium-manganese compound oxide and the high adsorption activity of the silicone-aluminum molecular sieve, so that 'two-effect' purification for diesel engine exhaust pollutant by the SCR catalytic unit can be realized.

Description

technical field [0001] The invention relates to an SCR catalyst for purifying diesel engine exhaust pollutants and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Due to its obvious advantages over gasoline engines in terms of power, economy and reliability, diesel engines are widely used in various types of vehicles. However, with the gradual tightening of China's emission control regulations, the issue of diesel engine pollutant emissions has also aroused widespread public concern. Although the carbon monoxide (CO) and hydrocarbon (HC) emissions of diesel vehicles are relatively low, their nitrogen oxides (NO x ) and particulate matter (PM) emissions. NO x PM and PM have great harm to the atmospheric environment and human health, and are also one of the main causes of smog. Diesel engine pollutant emission reduction is mainly carried out for the above two pollutants. [0003] Diesel engine pollutant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/78B01D53/94B01D53/56B01J20/18
CPCB01D53/9418B01D2257/402B01D2257/404B01D2258/012B01J20/18B01J29/7815Y02C20/10Y02T10/12
Inventor 孙亮张杰王刚周钧辛海峰赵九洲张元杨金吴嘉昉侯富华王燕岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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