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Cleaning catalyst for tail gas of automobile, and preparation method

A technology for purifying catalysts and automobile exhaust, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of being unable to resist the influence of high-concentration sulfides and reducing the activity of precious metals The number of centers, the reduction of catalyst characteristics, etc., to achieve good catalytic conversion performance, improve exhaust gas purification efficiency, and reduce the effects of poisoning

Active Publication Date: 2006-12-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the precious metals on the surface of alumina are easy to migrate and aggregate at high temperature, and the sintering of precious metal particles occurs, which will greatly reduce the number of active centers of the precious metals, and reduce the characteristics of the catalyst, such as light-off characteristics, air-fuel ratio and durability, etc.
[0007] These existing anti-sulfur catalysts are aimed at the influence of low-concentration and short-term exhaust gas sulfide, but cannot resist the influence of high-concentration sulfide

Method used

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  • Cleaning catalyst for tail gas of automobile, and preparation method

Examples

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example 2

[0039] This example illustrates the preparation of the automobile exhaust gas purification catalyst provided by the invention.

[0040] Prepare composite alumina support by the method of comparative example 1, in this support, Al 2 o 3 The content is 67.8% by weight, La 2 o 3 Content is 6.8 wt%, CeO 2 The content is 15.8% by weight, ZrO 2 The content is 9.6% by weight.

[0041] Prepare the catalyst by the method of Comparative Example 1, the difference is that 3.11g zirconium oxychloride (ZrOCl 2 ·8H 2 O) solution is fully mixed with 50ml containing Pt (1.56%), 2.03ml containing Rh (4.79%) precious metal chloride solution (mass ratio of Zr and precious metal is about 1: 1), impregnated into the prepared 25.3g composite On the alumina support, after drying at 110-130°C and roasting at 450-650°C, wet grinding into a slurry, and coating on the support, the catalyst A is prepared 2 . A 2 The base coat is composed of 92.44 wt% composite alumina support and 7.56 wt% active...

example 3

[0043] This example illustrates the preparation of the automobile exhaust gas purification catalyst provided by the invention.

[0044] Prepare composite alumina support by the method of comparative example 1, in this support, Al 2 o 3 The content is 72.8% by weight, La 2 o 3 Content is 7.5% by weight, CeO 2 The content is 14.6% by weight, ZrO 2 The content is 5.1% by weight.

[0045] Prepare catalyst by the method for comparative example 1, difference is that 11.66g lanthanum chloride solution and 50ml contain Pt (1.56%), 2.03ml contain Rh (4.79%) noble metal chloride solution and fully mix (the quality of La and noble metal The ratio is about 2:1), impregnated onto the prepared 25.3g composite alumina support, dried at 110-130°C and calcined at 450-650°C, wet ground into a slurry, and coated on the support to obtain Catalyst A 3 . A 3 The base coat is composed of 83.50 wt% composite alumina support and 16.50 wt% active components, i.e. 13.60 wt% La 2 o 3 , 2.90% by...

example 5

[0051] This example illustrates the preparation of the automobile exhaust gas purification catalyst provided by the invention.

[0052] Prepare composite alumina support by the method of comparative example 1, in this support, Al 2 o 3 The content is 83.5% by weight, La 2 o 3 Content is 4.3 wt%, CeO 2 The content is 9.1% by weight, ZrO 2 The content is 3.1% by weight.

[0053] Prepare the catalyst by the method of comparative example 4, the difference is that 12.44g zirconium oxychloride (ZrOCl 2 ·8H 2 (2) solution and 48.5ml containing Pd (1.82%) noble metal chloride solution are fully mixed (the mass ratio of Zr and noble metal is about 4: 1), impregnated on the prepared 25.3g composite alumina support, through 110 ~ Drying at 130°C and calcining at 450-650°C, wet grinding into slurry, and coating on the carrier to obtain catalyst A 5 . A 5 The base coat is composed of 81.77% by weight of composite alumina support and 18.23% by weight of active components, that is,...

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Abstract

A catalyst for cleaning the tail gas of car by decreasing the sulfide is composed of the carrier (67-95 Wt%) consisting of alumina and the oxide of the metal chosen from La, Ce, Pr, Nd, Zr, Mg, Cr, Mn, Fe, Co and Ni, and the active component consisting of the oxide of the metal chosen from Co, Mo, Ni, W, Zr, Ti, La, Ce, Pr and Nd and the oxide of noble metal chosen from Pt, Pd and Rh. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to an automobile tail gas purification catalyst and a preparation method thereof. Background technique [0002] In recent years, with the gradual strictness of environmental protection regulations, the quality of gasoline has seriously affected the treatment of vehicle exhaust and the control of pollutant emissions. Due to the small proportion of catalytic cracking gasoline in foreign countries, mainly hydrogenated and isomerized gasoline, even if the crude oil with high sulfur content in the Middle East is processed, the sulfur content in the finished gasoline will not be too high, so in foreign countries, especially in developed countries such as Europe and the United States In China, the sulfur content in gasoline will not have a great impact on the use of automobile exhaust purification catalysts, and there are few reports on the development of anti-sulfur poisoning automobile exhaust purification catalysts; The sulfur conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/40B01J23/89B01D53/94
Inventor 王志光达志坚贺振富邵潜李阳
Owner CHINA PETROLEUM & CHEM CORP
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