Effect of magnesium on preferential oxidation of carbon monoxide on platinum catalyst in hydrogen-rich stream

被引：35

作者：

Cho, Sung-Ho

Park, Jong-Soo

Choi, Seung-Hoon

Kim, Sung-Hyun

机构：

[1] Korea Univ, Dept Chem & Biol Engn, Sungbuk Ku, Seoul 136701, South Korea

[2] Korea Inst Energy Res, Convers Proc Res Ctr, Yusong Ku, Taejon 305600, South Korea

[3] Seonam Univ, Dept Environm & Chem Engn, Jeonbuk 590711, South Korea

来源：

JOURNAL OF POWER SOURCES | 2006年 / 156卷 / 02期

关键词：

preferential oxidation; carbon monoxide; water vapour; basicity; platinum-magnesium catalyst; fuel cell;

D O I：

10.1016/j.jpowsour.2005.06.019

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：

The effects of magnesium on platinum catalyst used for the preferential oxidation of carbon monoxide for polymer electrolyte membrane fuel cell applications are investigated. The CO conversion and selectivity on Pt-Mg/Al2O3 for a H-2-rich stream are 93.1 and 62.0%, respectively, but only 70.2 and 46.89% on Pt/Al2O3. The superior activity of Pt-Mg/Al2O3 for the preferential oxidation of CO is due to an increase in the hydroxyl groups that results from an increase in basicity with the addition of Mg, as well as to an increase in the electron density on the surface of the Pt catalyst. Moreover, the content of hydroxyl groups on the Pt catalysts is promoted by water vapour. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：260 / 266

页数：7

共 28 条

[1] Heterogeneous basic catalysts as alternatives to homogeneous catalysts:: reactivity of Mg/Al mixed oxides in the alkylation of m-cresol with methanol [J].