Synergistic Effect of a Carbon Black Supported PtAg Non-Alloy Bimetal Nanocatalyst for CO Preferential Oxidation in Excess Hydrogen

被引：15

作者：

Chen, Limin ^{[1
,2
]}

Ma, Ding ^{[2
,3
]}

Zhang, Zhen ^{[2
]}

Guo, Yuanyuan ^{[1
]}

Ye, Daiqi ^{[1
]}

Huang, Bichun ^{[1
]}

机构：

[1] S China Univ Technol, Coll Environm Sci & Engn, Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Guangdong, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[3] Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China

来源：

CHEMCATCHEM | 2012年 / 4卷 / 12期

基金：

国家教育部博士点专项基金资助;

关键词：

heterogeneous catalysis; hydrogen; platinum; silver; supported catalysts; SELECTIVE OXIDATION; CATALYTIC-OXIDATION; OXYGEN REDUCTION; SILVER CATALYSTS; AG NANOPARTICLES; RICH STREAM; FUEL-CELL; SURFACE; SILICA; PLATINUM;

D O I：

10.1002/cctc.201200365

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carbon black (CB) supported PtAg non-alloy bimetal catalysts were prepared by incipient wetness impregnation and evaluated for CO preferential oxidation in excess H2 (PROX). PtAg/CB catalysts exhibited an evident synergistic effect. The catalyst support selection is crucial to the synergistic effect. X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning TEM energy dispersive X-ray analysis (STEM-EDX) characterization indicates no alloy was formed over the PtAg/CB catalyst after activation in H2 at 500 degrees C for 2 h. However, temperature-programmed reduction (TPR) and XRD data evidenced strong interactions between platinum and silver, as a result of their simultaneous reduction and high temperature activation. The Pt?Ag interactions result in high catalytic performance and the synergistic effects. This is another example of model catalyst research translating to real world catalysis. PtAg non-alloy catalysts may also be effective in eliminating or alleviating catalyst poisoning by CO-like intermediates in direct liquid fuel cells.

引用

页码：1960 / 1967

页数：8

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