Promotion of Pt/γ-Al2O3 by new pretreatment for low-temperature preferential oxidation of CO in H2 for PEM fuel cells

被引：118

作者：

Son, IH

Shamsuzzoha, M

Lane, AM ^{[1
]}

机构：

[1] Univ Alabama, Dept Chem Engn, Tuscaloosa, AL 35487 USA

[2] Univ Alabama, Sch Mines & Energy Dev, Tuscaloosa, AL 35487 USA

[3] Univ Alabama, Dept Met & Mat Engn, Tuscaloosa, AL 35487 USA

来源：

JOURNAL OF CATALYSIS | 2002年 / 210卷 / 02期

关键词：

pretreatment; CO; selectivity; low temperature; preferential oxidation; Pt; gamma-Al2O3; fuel cells; small Pt particles; deactivation;

D O I：

10.1006/jcat.2002.3707

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 hydrogen-rich reformate used as a feed to polymer electrolyte fuel cells (PEFC) must contain less than 10 ppm CO since it poisons the Pt anode. The concentration of CO leaving the water-gas shift reactor is typically around 1 mol%, which is set by thermodynamic equilibrium. One method to remove the CO is by preferential oxidation (PROX) using O-2 over a (typically) Pt catalyst while minimizing the amount of H-2 oxidized. The activity and selectivity of this reaction were improved by a new pretreatment method for a 5 wt% Pt/gamma-Al2O3 catalyst. The pretreatment involved saturating the reduced catalyst with water and allowing it to vaporize during reduction. The improvement is attributed to a reduction in size of the metallic Pt particles as measured by XRD and TEM. (C) 2002 Elsevier Science (USA).

引用

页码：460 / 465

页数：6

共 13 条

[11] Activity and N2 selectivity of sol-gel prepared Pt/alumina catalysts for selective NOx reduction [J].