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Catalyst for controlling exhaust gas emission and method for manufacturing the same

A waste gas emission and catalyst technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems that transition metals do not show catalytic activity and do not realize the reduction of precious metals, etc.

Inactive Publication Date: 2007-07-04
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, transition metals alone have not been shown to have sufficient catalytic activity, and even if catalytic activity was improved by any conventional means, no reduction in the amount of noble metal used has been achieved.

Method used

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  • Catalyst for controlling exhaust gas emission and method for manufacturing the same
  • Catalyst for controlling exhaust gas emission and method for manufacturing the same
  • Catalyst for controlling exhaust gas emission and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The first step involves Pt(0.3wt.%)-Co(5.0wt.%)-Ce(8.8wt.%)-Al 2 O 3 Preparation of powder. Using cerium acetate aqueous solution will have a specific surface area of ​​200m 2 / g of alumina was soaked and impregnated, dried at 120°C overnight, and calcined at 600°C for 3 hours to obtain powder. At this time, a powder supporting 8.8 wt.% Ce when converted to oxide was obtained. The powder is immersed and impregnated with a mixed aqueous solution of dinitrodiammine platinum and cobalt nitrate so that when converted to metal, it becomes 0.3 wt.% Pt and 5.0 wt.% Co. After that, it was dried overnight at 120°C, and calcined at 400°C for 1 hour, so as to obtain a catalyst powder.

[0067] The second step involves the coating of the honeycomb body. Place 50 grams of the catalyst powder obtained in the first step above, 5 grams of boehmite, and 157 grams of an aqueous solution containing 10% nitric acid in a ceramic pot (grinding pot) made of alumina and shake with alumina balls, A...

Embodiment 2

[0069] Using barium acetate instead of cerium acetate in Example 1, the same process as in Example 1 was performed to obtain alumina with a Ba loading amount of 7.8 wt.% when converted to oxide. Thereafter, the honeycomb body was coated in the same manner as in Example 1 to obtain a sample of Example 2.

Embodiment 3

[0071] Using praseodymium acetate instead of cerium acetate in Example 1, the same process as in Example 1 was performed to obtain alumina having a Pr loading amount of 8.8 wt.% when converted to oxide. After that, the honeycomb body was coated in the same manner as in Example 1 to obtain a sample of Example 3.

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Abstract

A catalyst (1) for use in exhaust emission control that improves catalytic activity and reduces the amount of noble metal used and method for making such a catalyst (1). The catalyst (1) includes a noble metal first constituent (2); a transition metal compound second constituent (3), part or all of which forms a complex with the noble metal; a third constituent element (4) that is in contact with the complex and has an electronegativity of 1.5 or less; and a porous carrier (5) that supports the noble metal, the transition metal compound and the third constituent element (4), and that is such that part or all of which forms a complex oxide with the third constituent element (4).

Description

Technical field [0001] The present invention relates to a catalyst for exhaust emission control and a method of manufacturing such a catalyst, and more particularly to a catalyst for exhaust emission control for controlling exhaust emissions from internal combustion engines. Background technique [0002] Automobile exhaust emission control has been extended to the world. One form of emission control is to utilize so-called catalytic combustion or converter devices incorporated into the exhaust system of motor vehicles driven by internal combustion engines. The catalyst is typically made of alumina (Al 2 O 3 Pt (platinum), Pd (palladium), Rh (rhodium) and other noble metal particles supported by porous supports made of) or other oxides. The carrier is usually coated on a substrate such as a honeycomb made of cordierite. In order to adapt to stricter exhaust emission control, the amount of precious metals used in each car is increasing, resulting in an increase in the cost of each ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/00B01J37/02B01J23/89B01J23/40B01J23/48B01J23/54B01D53/94
CPCB01J23/6562B01D2255/2042B01J37/0248B01J23/8946B01J37/0205B01D2255/2092B01D2255/1021B01D53/945B01J23/89B01J23/54Y02T10/22B01D53/9445B01J35/002B01J23/66B01D2255/206B01J37/0207B01D2255/20746B01J23/894B01D2255/1023B01J23/8913Y02T10/12
Inventor 若松广宪安田博文白鸟一幸中村雅纪菅克雄关场彻
Owner NISSAN MOTOR CO LTD