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Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof

A technology for exhaust gas purification and double oxidation, which is applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Problems such as limited capacity

Active Publication Date: 2013-05-08
ZHEJIANG DA FENG AUTOMOBILE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the traditional diesel vehicle oxidation catalysts are single-oxidation catalysts. With one-time coating process, the loading capacity of the active coating is limited and the coating is easy to fall off. In order to meet the requirements of emission regulations, the content of the active component noble metal can only be increased, and the cost is relatively high. high

Method used

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  • Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof
  • Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof
  • Double-oxidization catalyst for purifying diesel engine exhaust and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021]A double oxidation catalyst for purifying diesel vehicle exhaust, comprising a front-stage carrier and a rear-stage carrier arranged in sequence along the axial direction of an engine exhaust port, the front-stage carrier is arranged close to the engine exhaust port, and the rear-stage carrier is far away from the engine The exhaust port is set, the front-stage carrier is coated with the front-stage coating, and the rear-stage carrier is coated with the rear-stage coating, which is used to prepare the slurry for the front-stage coating and the rear-stage coating. Contains deionized water, rare earth composite oxide, modified alumina, binder and active components, and at least one of the two slurries used to prepare the pre-coat and post-coat also contains Si-alumina composite oxide.

[0022] The slurry used to prepare the pre-coating contains deionized water, rare earth composite oxide and modified alumina, and its mass ratio is 1:0.2~0.6:0.3~0.5, which is used to prepar...

Embodiment 2

[0025] The difference from Example 1 is that the slurry used to prepare the front-level coating contains deionized water, rare earth composite oxide, modified alumina and silicon-aluminum composite oxide, and its mass ratio is 1:0.2~0.6: 0.3-0.5:0.6-0.7, the slurry used to prepare the back-stage coating contains deionized water, rare earth composite oxide and modified alumina, and the mass ratio thereof is 1:0.04-0.06:0.1-0.2.

Embodiment 3

[0027] The difference with Embodiment 1 and Embodiment 2 is that the slurry used to prepare the front-level coating contains deionized water, rare earth composite oxides, modified alumina and silicon-aluminum composite oxides, and its mass ratio is 1: 0.2~0.6:0.3~0.5:0.6~0.7, the slurry used to prepare the back-level coating contains deionized water, rare earth composite oxide, modified alumina and silicon-aluminum composite oxide, and its mass ratio is 1: 0.04~0.06:0.1~0.2:0.15~0.3.

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Abstract

The invention discloses a double-oxidization catalyst for purifying diesel engine exhaust and a preparation method thereof. The double-oxidization catalyst comprises a front-stage carrier and a rear-stage carrier which are orderly arranged along the axial direction of an engine exhaust port, wherein the front-stage carrier is arranged near the engine exhaust port; the rear-stage carrier is arranged far away from the engine exhaust port; a front-stage coating is coated on the front-stage carrier; a rear-stage coating is coated on the rear-stage carrier; slurries for preparing the front-stage coating and the rear-stage coating respectively contain deionized water, rare-earth complex oxide, modified aluminum oxide, a binder and active ingredients; and at least one of the two slurries for preparing the front-stage coating and the rear-stage coating also contains silica-alumina composite oxide. By adopting the double-oxidization catalyst for purifying the diesel engine exhaust and the preparation method thereof, the loading amount of the active coating is effectively increased; dropping of the coatings is overcome; the coatings are even and have significant catalytic activity; and purification of the diesel engine exhaust can be effectively achieved.

Description

technical field [0001] The invention relates to the technical field of diesel vehicle exhaust purification, in particular to a diesel vehicle exhaust purification double oxidation catalyst and a preparation method thereof. Background technique [0002] Diesel vehicle exhaust purification catalysts generally include two parts: carrier and active coating. Most of the traditional diesel vehicle oxidation catalysts are single-oxidation catalysts. With one-time coating process, the loading capacity of the active coating is limited and the coating is easy to fall off. In order to meet the requirements of emission regulations, the content of the active component noble metal can only be increased, and the cost is relatively high. high. In addition, diesel vehicles operate at relatively low temperatures compared to gasoline vehicles. During the operation of a diesel engine, 80-90% of the hydrocarbons and most of the carbon monoxide emissions occur during the cold start phase. This...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/02B01D53/94
Inventor 王磊王秋艳王侠为
Owner ZHEJIANG DA FENG AUTOMOBILE TECH
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