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NO*storage-reduction catalyzer for vehicle vent gas process and preparation method thereof

A catalyst and compound technology, applied in the field of automobile exhaust gas purification catalyst and its preparation, can solve the problems of loss of adsorption and storage function, blocked surface diffusion and desorption-resorption channel, etc., and achieves improved sulfur poisoning resistance, NOx storage performance improvement, The effect of improving hydrothermal stability

Active Publication Date: 2008-05-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As sulfate buildup increases, blocking NO x Surface diffusion and desorption-resorption pathways from Pt to adjacent adsorption sites, resulting in the catalyst’s NO x Loss of adsorption storage function

Method used

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  • NO*storage-reduction catalyzer for vehicle vent gas process and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 100 grams of cation exchange capacity (CMC) to 0.6 mmol / g of sodium bentonite (refined sodium bentonite from Xinyang Tongchuang Bentonite Co., Ltd.) into 1000 grams of 5% by weight lithium chloride solution, adjust with sodium hydroxide solution The pH value of the system is about 7, heated and stirred at 80°C for 8 hours, filtered, dried at 120°C, and ball-milled to 200 mesh to obtain lithium-based bentonite modified with lithium with an alkali metal / alkaline earth metal content of 3.2% by weight.

[0035] CuCl by isometric impregnation 2 The above-mentioned lithium-based bentonite was impregnated with the solution, the loading amount of Cu was controlled to be 1.7% by weight, dried at 90° C. for 4 hours, and calcined at 500° C. for 2 hours to obtain Cu / lithium-based bentonite.

[0036] Then the Cu / lithium-based bentonite was impregnated with chloroplatinic acid solution by an equal volume impregnation method, and the loading amount of Pt was controlled to be 0.24%...

Embodiment 2

[0038] Add 30 grams of cation exchange capacity (CMC) to 0.6 mmol / g of sodium bentonite (refined sodium bentonite from Xinyang Tongchuang Bentonite Co., Ltd.) into 1000 grams of 8% by weight potassium chloride solution, adjust with sodium hydroxide solution The pH value of the system is about 8, heated and stirred at 60°C for 10 hours, filtered, dried at 120°C, ball milled to 200 mesh, and potassium-based bentonite modified with potassium with an alkali metal / alkaline earth metal content of 0.85% by weight is prepared.

[0039] The potassium-based bentonite was impregnated with a titanium trichloride solution by an equal-volume impregnation method to control the loading amount of Ti to 0.8% by weight, dried at 90°C for 4 hours, and calcined at 600°C for 2 hours to obtain Ti / potassium-based bentonite.

[0040] Then impregnate the above-mentioned Ti / potassium bentonite with chloroplatinic acid solution by an equal volume impregnation method, and control the loading amount of Pt t...

Embodiment 3

[0042] Add 200 grams of cation exchange capacity (CMC) to 0.6 mmol / g of sodium bentonite (refined sodium bentonite from Xinyang Tongchuang Bentonite Co., Ltd.) into 1000 grams of 4% by weight barium chloride solution, adjust with sodium hydroxide solution The pH value of the system is about 6, heated and stirred at 70°C for 9 hours, filtered, dried at 120°C, and ball-milled to 200 mesh to obtain barium-modified barium-based bentonite with an alkali metal / alkaline earth metal content of 1.3% by weight.

[0043] Zr(NO 3 ) 4 The above-mentioned barium-based bentonite was impregnated with the solution, the loading amount of Zr was controlled to be 1.2% by weight, dried at 90° C. for 4 hours, and calcined at 600° C. for 2 hours to obtain Zr / barium-based bentonite.

[0044] Then impregnate the above-mentioned Zr / barium-based bentonite with palladium nitrate solution by equal volume impregnation method, and control the loading amount of Pd to be 0.35% by weight. Then dry at 90°C fo...

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Abstract

The invention relates to automobile exhaust purification catalyst and a preparation method thereof, in particular to the automobile exhaust purification catalyst with the NOx storing-restoring function, and the preparation method thereof. The NOx storing-restoring catalyst provided by the invention consists of a bentonite carrier and at least one precious metal active component carried on the carrier and selected from the group composed of Pt, Pd and Rh. The content of the precious metal is 0.01 to 1.0 percent of the total weight of the catalyst. The catalyst can also include at least one transition metal taken as an auxiliary active component and selected from Ti, Mn, Fe, Co, Ni, Cu, Zn and Zr, and the content of the transition metal is 0 to 5 percent of the total weight of the catalyst. The bentonite can be modified by alkali metal and or alkaline earth metal compound. The NOx storing-restoring catalyst of the invention can effectively improve the NOx storing-restoring capability, and improve the capabilities of sulfur poisoning resistance and heat aging resistance and so on, and has simple preparation.

Description

technical field [0001] The present invention relates to a kind of automobile tail gas purifying catalyst and its preparation method, in particular, to a catalyst with NO x Automobile tail gas purification catalyst with storage-reduction function and preparation method thereof. Background technique [0002] With the rapid increase in the number of automobiles, the exhaust gas emitted by automobiles has become one of the main pollution sources of the atmosphere. CO, HC, and NO x and other components seriously endanger the public environment and human health. In order to purify most of the exhaust gas from conventional gasoline engines, three-way catalysts are mostly used at present. The purification efficiency of the above-mentioned three-way catalyst for pollutants is greatly affected by the air-fuel ratio, among which NO x The purification efficiency will decrease sharply with the increase of the air-fuel ratio, so the existence of excess oxygen in the exhaust gas produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/40B01J21/16B01D53/94B01D53/56
Inventor 刘武略欧玲丁大勇王胜杰
Owner BYD CO LTD
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