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Honeycomb metal wire net carrier catalyst for catalytically reducing nitrogen oxide and preparing method thereof

A honeycomb metal and nitrogen oxide technology, which is applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of easy deactivation, high catalytic reaction temperature, Affect catalyst light-off characteristics and other issues, to achieve the effect of radial mass transfer and heat transfer, fast thermal response, and improve excellent catalytic characteristics

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

Disadvantages: The catalytic carrier used is a monolithic ceramic carrier, which affects the light-off characteristics of the catalyst
Disadvantages: (1) The catalytic carrier used is a ceramic carrier; (2) The catalytic reaction temperature is relatively high; (3) The catalyst used is a molecular sieve carrier, which is easily deactivated in the presence of water vapor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] For the existing problem that the working window suitable for lean-burn engine exhaust is narrow, the following method is used to prepare a honeycomb wire mesh carrier catalyst with higher content of titanium dioxide and cerium-zirconium oxide and lower content of catalytically active component palladium.

[0042] The first step, the preparation of titanium dioxide sol

[0043] 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;

[0044] The second step, preparation of titanium dioxide coating on the surface of alumina powder

[0045] Immerse the aluminum oxide-coated honeycomb wire mesh carrier in 100ml of titanium sol for 2min, and dry...

Embodiment 2

[0055] For the problem of high reaction temperature of existing catalysts suitable for lean-burn engine exhaust, the following method is used to prepare a honeycomb wire mesh carrier catalyst with low content of titanium dioxide and cerium-zirconium oxide and high content of catalytically active component palladium.

[0056] The first step, the preparation of titanium dioxide sol

[0057]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;

[0058] The second step, preparation of titanium dioxide coating on the surface of alumina powder

[0059] Immerse the aluminum oxide-coated honeycomb wire mesh carrier in 100ml of titanium sol for 10mi...

Embodiment 3

[0069] Catalysts used for motor vehicle exhaust generally use ceramic carriers. The catalyst prepared on the honeycomb wire mesh carrier by the following method solves the problem of high reaction temperature and narrow working window of the existing lean-burn engine exhaust catalysts. Problems can meet laboratory as well as practical needs.

[0070] The first step, the preparation of titanium dioxide sol

[0071] 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;

[0072] The second step, preparation of titanium dioxide coating on the surface of alumina powder

[0073] Immerse the aluminum oxide-coated honeycomb wire mesh carrier in 100ml of...

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Abstract

The invention relates to a honeycomb metal network carrier catalyst for catalyzing and reducing nitrogen oxide, and relative preparation, used in vehicle tail gas purification technique. The invention comprises metal carrier and catalyst, characterized in that the catalyst is load-type catalyst, the catalyst carrier is honeycomb metal network carrier carrying gamma-Al2O3 coat, referring coat mass, the content of TiO2 is 14.0-20.0wt% and the content of CeZrO is 3.0-6.0wt%, and referring to catalyst mass, the content of active component palladium is 0.1-1.0wt%, and the preparation comprises that preparing TiO2 gel, preparing TiO2 coat at the face of carrier, loading cerium zirconium oxide on carrier, leading in catalyst active component palladium. The invention has the advantages that the invention can improve mass transfer and heat transfer in catalyst, the catalyst has higher catalysis activity in low-temperature oxygen-abundant condition, wide active temperature window, simple preparation and low cost.

Description

technical field [0001] The invention relates to a honeycomb wire mesh catalyst which is suitable for catalytic purification treatment of exhaust gas of lean-burn gasoline engines or diesel engines and uses metal palladium as an active component and a preparation method thereof, belonging to the technical field of catalytic purification of automobile tail gas. Background technique [0002] Automobile exhaust has become the main source of air pollution, and the installation of catalytic converters is one of the most effective methods for the prevention and control of exhaust pollution. At present, the mainstream technology for automotive exhaust purification is to use a three-way catalytic converter. This purification technology requires the engine to work under stoichiometric ratio conditions, and can simultaneously purify carbon monoxide, unburned hydrocarbons and nitrogen oxides under the condition of controlling the air-fuel ratio. The main harmful and toxic substances in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J21/04B01J37/025B01J35/04B01D53/94
Inventor 全燮孙红张耀斌赵雅芝
Owner DALIAN UNIV OF TECH
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