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Preparation method for oxidation catalyst used for purifying diesel exhaust

An oxidation catalyst and diesel engine technology, applied in the field of catalysis, can solve problems such as catalyst deactivation, and achieve the effect of improving oxidation rate and good thermal stability

Active Publication Date: 2014-04-30
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At high temperatures, sintering of catalyst active components or supports can lead to catalyst deactivation

Method used

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  • Preparation method for oxidation catalyst used for purifying diesel exhaust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The catalyst consists of three parts: carrier, coating and noble metal. The catalyst carrier is cordierite honeycomb ceramics with a volume of 1.101L and a pore density of 400 mesh / square foot; the coating contains titanium-silicon-aluminum composite oxide and molecular sieve, and the coating amount is 150 g / L; the used The precious metal is platinum or / and palladium, the total coating amount of precious metal is 3.9 g / L, and the mass ratio of Pt to Pd is 1:2.

[0027] (1) Preparation of the first coating slurry: Take the material according to the titanium-silicon-aluminum composite oxide: water mass ratio of 4:3, stir evenly to form a slurry; use the ball milling process to process the slurry to control the particle size D 90 At 5 μm, a first coating slurry was prepared;

[0028] (2) Preparation of the first precious metal solution: adding precious metals to the first coating slurry obtained in step (1); wherein the mass ratio of noble metal platinum: noble metal pall...

Embodiment 2

[0035] The specific preparation method and activity test are basically the same as in Example 1, except that the mass ratio of Pt:Pd in ​​the total precious metal coating amount is 1:1.

Embodiment 3

[0037] The specific preparation method and activity test are basically the same as in Example 1, except that the mass ratio of Pt:Pd in ​​the total precious metal coating amount is 2:1.

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Abstract

The invention relates to a preparation method for an oxidation catalyst used for purifying diesel exhaust and belongs to the technical field of catalysis. The catalyst has a higher conversion ratio to hydrocarbon and carbon monoxide inside the diesel exhaust, and can be used for oxidizing nitric oxide into nitrogen dioxide. The catalyst takes cordierite honeycomb ceramics or Fe-Cr-Al metallic honeycombs as a base body, takes a titanium, silicon and aluminum composite oxide and a molecular sieve as coating layers, and takes Pt or / and Pd as an active component. The catalyst is divided into two layers adopting use levels of Pt and Pd in varying proportions, so as to adjust the proportion of the nitrogen dioxide in the exhaust. The oxidation catalyst can effectively lower HC and CO of gaseous phases in diesel engine exhaust, can effectively improve the oxygenation efficiency of NO, and has better heat stability.

Description

technical field [0001] The invention relates to an oxidation catalyst for purifying diesel vehicle tail gas and a preparation method thereof. The catalyst coating has an inner and outer double-layer structure, reduces hydrocarbons and carbon monoxide in diesel vehicle tail gas through oxidation, and has a high resistance to nitrogen monoxide Oxidation ability belongs to the technical field of catalysis. Background technique [0002] The diesel engine has high fuel efficiency, stable power performance, and emits less gas phase alkanes and carbon monoxide under high air-fuel ratio working conditions. Even so, with the increase in ownership, the impact of its exhaust on air pollution is also intensifying. The recent frequent smog incidents in China have attracted widespread public attention. Pollutants emitted by diesel vehicles include nitrogen oxides (NOx), particulate matter (PM), incompletely burned carbon monoxide (CO) and hydrocarbons (HC). NOx mainly includes nitric ox...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01J29/78B01J37/02B01D53/94B01D53/56B01D53/62B01D53/72
CPCY02A50/20
Inventor 王刚张辉杨金曾德智陈正国刘洋
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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