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A double oxidation catalyst for purifying diesel vehicle exhaust and its preparation method

A technology for exhaust gas purification and double oxidation, which is used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. Saving dosage, reducing production cost, good uniformity

Active Publication Date: 2014-10-08
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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  • A double oxidation catalyst for purifying diesel vehicle exhaust and its preparation method
  • A double oxidation catalyst for purifying diesel vehicle exhaust and its preparation method
  • A double oxidation catalyst for purifying diesel vehicle exhaust and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A dual-oxidation catalyst for purifying exhaust gas of diesel vehicles includes a front-stage carrier and a rear-stage carrier arranged in sequence along the axial direction of the engine exhaust port, the front-stage carrier is arranged close to the engine exhaust port, and the rear-stage carrier is away from the engine The exhaust port is arranged, the front-stage carrier is coated with a front-stage coating, and the rear-stage carrier is coated with a rear-stage coating, which is used to prepare the slurry of the front-stage coating and the rear-stage coating. Contain 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-coating and post-coating also contains Silicon aluminum composite oxide.

[0021] The slurry used to prepare the pre-coating contains deionized water, rare earth composite oxide and modified alumina, and the mass ratio is 1:0.2~0.6:0.3~0.5, and the slurry...

Embodiment 2

[0024] The difference from the first embodiment is that the slurry used to prepare the pre-coating layer 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 for preparing the subsequent coating includes deionized water, rare earth composite oxide and modified alumina, and the mass ratio is 1:0.04 to 0.06: 0.1 to 0.2.

Embodiment 3

[0026] The difference from Example 1 and Example 2 is that the slurry used to prepare the pre-coating layer 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 subsequent 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 tail gas purification, in particular to a double oxidation catalyst for diesel vehicle tail gas purification and a preparation method thereof. Background technique [0002] Diesel vehicle exhaust gas purification catalyst generally includes two parts: carrier and active coating. Traditional oxidation catalysts for diesel vehicles are mostly single-oxidation catalysts. The one-time coating process is adopted. The active coating has a limited load and the coating is easy to fall off. In order to meet the requirements of emission regulations, only the content of active components can be increased, and the cost is relatively high. high. In addition, compared with gasoline vehicles, diesel vehicles have relatively low operating temperatures. During the operation of a diesel engine, 80-90% of hydrocarbons and most carbon monoxide emissions occur during the cold start phase. This is because the temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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