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Goldcatalyst on ceria-containing support

A technology of gold catalyst and ceria, applied in the field of gold catalyst, can solve the problems of no performance, high activity, etc.

Inactive Publication Date: 2008-08-27
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] It was found that most gold / ceria catalysts do not show very high activity below 100 °C which is better for PROX reactions

Method used

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  • Goldcatalyst on ceria-containing support
  • Goldcatalyst on ceria-containing support
  • Goldcatalyst on ceria-containing support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0156] Using air through a 0.8mm diameter nozzle (5m 3 / h) 1200 g / h of a solution of cerium(III) 2-ethylhexanoate (49% by weight) in 2-ethylhexanoic acid (51% by weight) are atomized into the reaction chamber. Here, combustion consists of hydrogen (10m 3 / h) and primary air (10m 3 / h) composed of an oxyhydrogen flame in which the aerosol reacts. In addition, introduce 20m into the reaction chamber 3 / h of secondary air. A flow restrictor 150 mm long and 15 mm in diameter was installed below the flame in the reaction chamber through which the reaction mixture passed. After cooling, a filter is used to separate the ceria powder from the gaseous matter.

Embodiment 2-4

[0158] Embodiment 2-4 is implemented according to the same method as embodiment 1; dosage and other process parameters can be obtained from table 1. In Example 5, no flow restrictor was used and cerium (III) nitrate was used instead of cerium (III) 2-ethylhexanoate.

[0159] The physico-chemical data of the ceria powder obtained in Table 2 are given.

[0160] The names of the dispersions correspond to the relevant powders. Dispersion D1 corresponds to powder P1 of Example 1, D2 corresponds to P2 and so on.

[0161] Table 1: Preparation of ceria powder P starting from cerium(III) 2-ethylhexanoate n Process parameters in

[0162] According to the embodiment of the present invention

Example

1

2

3

4

Cerium content

Mass Flow

wt.%

g / h

12

1200

12

1200

12

1400

10

1200

gas volume flow

hydrogen

primary air

secondary air

...

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Abstract

Goldcatalyst comprising gold on a support of ceria or ceria-manganese oxide is used for the oxidation of CO in a H2 stream.

Description

technical field [0001] The subject of the present invention is a gold catalyst, a process for its preparation and its use. Background technique [0002] Gold with a large particle size has been considered to be a poorly active catalyst. [0003] Theoretical calculations have explained that the smooth surface of Au is important in the dissociation adsorption of hydrogen (Hammer and Norskov, 1995). [0004] However, when Au is deposited on metal oxide-like nanoparticles by co-precipitation and deposition precipitation techniques, it exhibits surprisingly high catalytic activity for CO oxidation at temperatures as low as 200 K (Haruta et al. 1989; Haruta and Daté , 2001). This discovery has inspired many scientists and engineers to study Au catalysis since 1990. [0005] Many excellent reviews have been reported (Bond and Thompson, 1999; 2000; Cosandey and Madey, 2001; Kozlov et al., 1999; Haruta, 1997a,b; Haruta and Date, 2001; Okumura, 1999). [0006] Selective removal of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/00B01J23/63C01B32/40
CPCB01J23/52B01D53/864B01D2255/106B01D2255/206B01D2255/2073B01D2257/502B01J23/63B01J23/688B01J35/0013B01J35/023B01J35/1014B01J35/1019B01J37/0205B01J37/0207B01J35/23B01J35/40B01J35/613B01J35/615B01J35/00
Inventor M·克勒尔S·卡图希奇M·克雷默钟智育陈郁文
Owner EVONIK DEGUSSA GMBH