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Nanosized Pt-Co catalysts for the preferential CO oxidation

被引：21
作者：
Ko, Eun-Yong
Park, Eun Duck
Seo, Kyung Won
Lee, Hyun Chul
Lee, Doohwan
Kim, Soonho
机构：
[1] Ajou Univ, Dept Chem Engn, Div Chem Engn & Mat Engn, Suwon 443749, South Korea
[2] Samsung Adv Inst Technol, Energy Lab, Suwon 440600, South Korea
来源：
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY | 2006年 / 6卷 / 11期
关键词：
CO oxidation; PROX; Pt/gamma-Al2O3; Pt-Co; fuel cell; HYDROGEN-RICH GAS; CARBON-MONOXIDE; SELECTIVE OXIDATION; LOW-TEMPERATURE; BIMETALLIC CATALYSTS; FUEL-CELLS; PLATINUM; H-2; PT/GAMMA-AL2O3; PROMOTION;
D O I：
10.1166/jnn.2006.058
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The preferential CO oxidation in the presence of excess hydrogen was studied over Pt-Co/gamma-Al2O3. CO chemisorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectrometer (EDX) and temperature programmed reduction (TPR) were conducted to characterize active catalysts. The catalytic activity for CO oxidation and methanation at low temperatures increased with the amounts of cobalt in Pt-Co/gamma-Al2O3. This accompanied the TPR peak shift to lower temperatures. The optimum molar ratio between Co and Pt was determined to be 10. The co-impregnated Pt-Co/gamma-Al2O3 appeared to be superior to Pt/Co/gamma-Al2O3 and Co/Pt/gamma-Al2O3. The reductive pretreatment at high temperature such as 773 K increased the CO2 selectivity over a wide reaction temperature. The bimetallic phase of Pt-Co seems to give rise to high catalytic activity in selective oxidation of CO in H-2-rich stream.
引用
收藏
页码：3567 / 3571
页数：5
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