Catalyst for catalytic cleaning of lean-burn engine tail gas and its preparing process

A lean-burn engine, catalytic purification technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Wide operating temperature window, etc., to achieve good low-temperature catalytic activity, expand the reaction activity window, and improve the effect of dispersion.

Inactive Publication Date: 2007-08-15
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Purpose and task of the present invention are to overcome existing catalyzer to exist: (1) can't catalytic reduction NO well at lower temperature x (2) The deficiency of the narrow active temperature window, and provide a kind of low-temperature catalytic activity height, wide operating temperature window, be applicable to the catalyst and preparation method thereof of NOx in catalytic purification lean-burn engine tail gas, especially propose technical solution of the present invention Program

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] For the problem of narrow working window of the existing catalyst used for lean-burn engine exhaust, the catalyst prepared by the following method widens the working window of the catalyst by increasing the content of titanium dioxide and cerium-zirconium oxide.

[0034] The first step, the preparation of titanium dioxide sol

[0035] Dissolve 28.43ml of tetrabutyl titanate in 56.87ml of absolute ethanol, then add 4.8ml of diethanolamine, stir at room temperature for 2 hours, add 9.9ml of a mixed solution of water and ethanol with a volume ratio of 1:10, and then add 0.5g of polyethylene glycol with a molecular weight of 2000, and then ultrasonically dispersed for 10 minutes, a transparent yellow sol can be obtained;

[0036] The second step, preparation of titanium dioxide coating on the surface of alumina powder

[0037] Add 2.0g of alumina powder into 50ml of titanium sol for 2min, dry at 120°C for 6h; repeat this step twice; then raise the temperature to 600°C in a...

Embodiment 2

[0046] For existing catalysts used for lean-burn engine exhaust gas, the reaction temperature is relatively high, and the following method is used to prepare a catalyst with a relatively high content of palladium in the catalytic active component.

[0047] The first step, the preparation of titanium dioxide sol

[0048] Dissolve 12.19ml of tetrabutyl titanate in 73.11ml of absolute ethanol, then add 4.8ml of diethanolamine, stir at room temperature for 2 hours, add 9.9ml of a mixed solution of water and ethanol with a volume ratio of 1:10, and then add 2.0g of polyethylene glycol with a molecular weight of 2000, and then ultrasonically dispersed for 20 minutes, a transparent light yellow sol can be obtained;

[0049] The second step, preparation of titanium dioxide coating on the surface of alumina powder

[0050] Add 2.0g of alumina powder into 50ml of titanium sol for 10min, dry at 100°C for 10h; repeat this step 5 times; then raise the temperature to 400°C in a muffle furn...

Embodiment 3

[0059]For the problems of high reaction temperature and narrow working window of existing catalysts used for exhaust gas of lean-burn engines, the following method is used to prepare catalysts with appropriate content of titanium dioxide and cerium-zirconium oxides and low palladium content, which can meet the requirements of the laboratory need.

[0060] The first step, the preparation of titanium dioxide sol

[0061] Dissolve 17.02ml of tetrabutyl titanate in 68.28ml of absolute ethanol, then add 4.8ml of diethanolamine, stir at room temperature for 2 hours, add 9.9ml of a mixed solution of water and ethanol with a volume ratio of 1:10, and then add 1.0g of polyethylene glycol with a molecular weight of 2000, and ultrasonically disperse for 15 minutes, a transparent light yellow sol can be obtained;

[0062] The second step, preparation of titanium dioxide coating on the surface of alumina powder

[0063] Add 2.0g of alumina powder into 50ml of titanium sol for 5min, dry a...

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Abstract

The invention relates to a catalyst for catalyzing and purifying tail gas of engine, and relative preparation, used in vehicle tail gas purification technique. The invention comprises that carrier and catalyst active component, characterized in that the catalyst uses gamma-Al2O3 as carrier, adhered with mixed oxide coat of titania and cerium zirconium, the invention loads active component palladium via immerge method, referring the carrier mass, the content of TiO2 is 14.0-20.0wt% and the content of CeZrO is 3.0-6.0wt%, referring to catalyst mass, the content of active component palladium is 0.1-1.0wt%. And the preparation comprises that preparing titania gel, preparing titania coat on the face of Al2O3, preparing cerium zirconium gel, loading cerium zirconium oxide on the carrier adhered with titania coat, and leading in active component palladium. The invention has the advantages that under over-oxygen condition, in low-temperature, the invention has strong activity for removing nitrogen oxide, with simple production.

Description

technical field [0001] The invention relates to a catalyst for catalytically purifying lean-burn engine exhaust gas and a preparation method thereof. The catalyst uses alumina as a carrier, supports titanium dioxide and cerium-zirconium mixed oxide on its surface, and precious metal palladium as an active component, and belongs to the catalytic purification of automobile exhaust gas technology field. Background technique [0002] With the increasing calls for energy conservation and environmental protection, lean-burn engines can reduce greenhouse gas CO due to improved fuel economy 2 Emissions have received more and more attention. Lean-burn engines include lean-burn gasoline engines and diesel engines. Compared with conventional gasoline engines operating under stoichiometric conditions, the reducing exhaust components in the exhaust gas, carbon monoxide (CO), hydrogen (H 2 ) and incompletely combusted hydrocarbons (HC) are less, and the corresponding exhaust gas contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J32/00B01J37/025B01D53/94
Inventor 全燮孙红张耀斌赵雅芝
Owner DALIAN UNIV OF TECH
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