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NOx storage-reduction catalyst for vehicle tail gas treatment and preparation method of catalyst

A technology of catalyst and compound, which is applied in the field of automobile exhaust purification catalyst and its preparation, can solve the problems of blocking surface diffusion and desorption-re-adsorption channels, loss of adsorption and storage functions, etc., to improve NOx storage performance, improve resistance to sulfur poisoning, Conducive to the effect of NOx removal

Inactive Publication Date: 2017-01-04
桐城市宇洁机动车尾气检测有限公司
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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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  • NOx storage-reduction catalyst for vehicle tail gas treatment and preparation method of catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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.

[0032] 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.

[0033] 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

[0035] 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.

[0036] The potassium-based bentonite was impregnated with a titanium trichloride solution by an equal-volume impregnation method to control the loading 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.

[0037] 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 to be 0....

Embodiment 3

[0039] 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.

[0040] 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.

[0041] 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 a vehicle tail gas purifying catalyst and a preparation method thereof, in particular to a vehicle tail gas purifying catalyst with the NOx storage-reduction function and a preparation method of the catalyst. The NOx storage-reduction catalyst comprises a bentonite carrier and noble metal active components loaded on the carrier and selected from at least one of groups composed of Pt, Pd and Rh. The content of the noble metal is 0.01-1.0% of the total weight of the catalyst. The catalyst can also contain transition metal serving as the auxiliary active component and selected from at least one of Ti, Mn, Fe, Co, Ni, Cu, Zn and Zr, and the content of the transition metal is 0-5% of the total weight of the catalyst. Bentonite can be modified with alkali metal and / or alkaline-earth metal compounds. The NOx storage-reduction catalyst can effectively improve the NOx storage-reduction capacity, sulfur poisoning resistance, thermal ageing resistance and other capacities, and preparation of the catalyst is easy.

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): B01J23/58B01J23/89B01D53/94B01D53/56
CPCB01D53/9422B01J23/002B01J23/58B01J23/8926B01J23/8946B01J37/0201B01J37/30B01J2523/00B01J35/19B01J2523/11B01J2523/12B01J2523/13B01J2523/17B01J2523/25B01J2523/47B01J2523/48B01J2523/828B01J2523/824B01J2523/842
Inventor 胡雪林
Owner 桐城市宇洁机动车尾气检测有限公司
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