Preparation method of composite oxide catalyst used for purifying diesel engine

A composite oxide and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. and human health hazards

Active Publication Date: 2015-07-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the advantages of high thermal efficiency, long service life and good reliability, diesel engines are widely used in construction machinery, automobiles and other fields; however, the PM and NO of diesel engines x The emission is relatively high, and it poses a great threat to the environment and human health. Among them, NO x It is easy to combine with water vapor and dust in the air to form photochemical smog and acid rain, and even smog, which will cause harm to the atmospheric environment and human health. PM contains polycyclic aromatic hydrocarbons with strong biological toxicity, such as benzopyrene, which is harmful to the heart. , Respiratory system is very harmful; pollutants in diesel engine exhaust mainly contain PM and NO x , NO x Mainly including NO and NO 2 ;

Method used

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  • Preparation method of composite oxide catalyst used for purifying diesel engine
  • Preparation method of composite oxide catalyst used for purifying diesel engine
  • Preparation method of composite oxide catalyst used for purifying diesel engine

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Experimental program
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Embodiment 1

[0026] The coated catalyst is one, the composite oxide catalyst is composed of a catalyst carrier and a catalyst coating, the catalyst carrier is a cordierite honeycomb ceramic carrier, the volume is 1.298L, the mesh number is 300, and the porosity is 25%; the catalyst coating contains Ce-Ba-Al 2 o 3 composite oxides.

[0027] 1) Preparation of the first catalyst slurry: according to Ce-Ba-Al 2 o 3 The stoichiometric ratio of composite oxide weighs 66.9579gBa(CH 3 COO) 2 , 237.0756gCe(NO 3 )3 ·6H 2 O and 112.5g γ-Al 2 o 3 ; Add 416.55ml of distilled water so that the ratio of water to mixed powder mass is 1:1, stir for 1 hour to obtain the first slurry.

[0028] 2) Preparation of the second catalyst slurry: according to Ce-Ba-Al 2 o 3 The stoichiometric ratio of composite oxide weighs 22.3193gBa(CH 3 COO) 2 , 79.0252gCe(NO 3 ) 3 ·6H 2 O and 37.5g γ-Al 2 o 3 ; Add 277.7ml of distilled water so that the mass ratio of water to mixed powder is 2:1, stir for 1 hou...

Embodiment 2

[0032] There are two types of coated catalysts; the composite oxide catalyst consists of three parts: catalyst carrier, catalyst coating and precious metal; the catalyst carrier is a cordierite honeycomb ceramic carrier with a volume of 1.298L, a mesh number of 300, and a porosity of 25%; the catalyst Coating contains Ce-Ba-Al 2 o 3 Composite oxide; the noble metal used is Pt.

[0033] 1) Preparation of the first catalyst slurry: according to Ce-Ba-Al 2 o 3 Composite oxide: Weigh 44.6386gBa(CH 3 COO) 2 , 158.0504gCe(NO 3 ) 3 ·6H 2 O and 75g γ-Al 2 o 3 ; Add 277.7ml of distilled water so that the mass ratio of water to mixed powder is 1:1, stir for 1 hour to obtain the first slurry.

[0034] 2) Preparation of the second catalyst slurry: according to Pt-Ce-Ba-Al 2 o 3 Composite oxide: Weigh 44.6386gBa(CH 3 COO) 2 , 158.0504gCe(NO 3 ) 3 ·6H 2 O and 75g γ-Al 2 o 3 ; Add 277.7ml of distilled water so that the ratio of water to mixed powder mass is 1:1, stir for 1...

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Abstract

The invention relates to a preparation method of a composite oxide catalyst used for purifying a diesel engine and belongs to the technical field of catalysis. The catalyst is prepared with cordierite honeycomb-like ceramic as a carrier, with [gamma]-Al2O3 as a coating and with Pt as an active component with addition of components such as Ce, Ba and the like. In the composite oxide catalyst, one or two coated catalysts can be employed, when one coated catalyst is employed, the coated catalyst is one of an oxidizing catalyst or a reducing catalyst and the catalyst can be used for coating an A zone and a B zone of the carrier at different coating amounts; and when two coated catalysts are employed, one is the oxidizing catalyst and the other is the reducing catalyst. The one or two catalysts coat the same carrier with different loading capacities in the A zone and the B zone of the carrier. The composite oxide catalyst can effectively reduce discharge of PM and NOx in tail gas of the diesel engine, can effectively increase the conversion rates of the PM and the NOx, and is better in economy.

Description

technical field [0001] The patent of the present invention relates to a composite oxide catalyst for diesel engines and its preparation method, by providing different coating amounts of catalysts or coating different types of catalysts on the same catalyst carrier A area and B area; when the type of catalyst coated When it is one type, catalysts with different coating amounts are provided in the carrier A area and B area, which improves the overall utilization rate of the catalyst; when there are two types of catalysts coated, one is an oxidation catalyst, and the other is a Reduction catalyst, through oxidation and reduction catalysts, PM and NO in diesel engine exhaust can be reduced at the same time x emissions, and has a high economy. technical background [0002] Due to the advantages of high thermal efficiency, long service life and good reliability, diesel engines are widely used in construction machinery, automobiles and other fields; however, the PM and NO of diese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/94B01D53/56F01N3/035
Inventor 王攀谷文业雷利利乔冠军
Owner JIANGSU UNIV
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