Effect of Alkali Metal Promoters on Water-Gas Shift Activity over Au-Pt/CeO2 Catalyst

被引：9

作者：

Yu Qiangqiang ^{[1
]}

Li Yang ^{[1
]}

Zou Xuhua ^{[1
]}

Zhuo Hongying ^{[1
]}

Yao Yuanyuan ^{[1
]}

Suo Zhanghuai ^{[1
]}

机构：

[1] Yantai Univ, Inst Appl Catalysis, Yantai 264005, Shandong, Peoples R China

来源：

CHINESE JOURNAL OF CATALYSIS | 2010年 / 31卷 / 06期

关键词：

ceria; platinum; gold; potassium; promoter; water-gas shift; PREFERENTIAL CO OXIDATION; GOLD CATALYSTS; REACTION-MECHANISM; HYDROGEN; CERIA; PERFORMANCE; POTASSIUM; PT/AL2O3; AU/CEO2; CARBON;

D O I：

10.3724/SP.J.1088.2010.91131

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Au-Pt/CeO2 catalyst samples modified with alkali metals M (M = Na, K, Rb, and Cs) were prepared and their catalytic activity for water-gas shift (WGS) was evaluated. The structure and surface properties of the Au-Pt/CeO2 catalyst promoted by potassium were investigated by X-ray powder diffraction, H-2 temperature-programmed reduction, ultraviolet-visible diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The higher activity obtained on the K-promoted Au-Pt/CeO2 sample was possibly due to the reduction of Au3+ species and the enrichment of Ce3+ on the catalyst surface, which generated more oxygen vacancies. The catalytic activity of Au-Pt/CeO2 was greatly influenced by the alkali metals. When the K content was 0.025%, the CO conversion achieved up to 95% at 250 degrees C.

引用

页码：671 / 676

页数：6

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