Preferential CO oxidation in hydrogen-rich stream over Pt catalysts modified with alkali metals - Part I. Catalytic performance

被引：48

作者：

Tanaka, Hisanori ^{[1
]}

Kuriyama, Masatoshi ^{[1
]}

Ishida, Yoichi ^{[1
]}

Ito, Shin-ichi ^{[1
]}

Tomishige, Kefichi ^{[1
]}

Kunimori, Kimio ^{[1
]}

机构：

[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

APPLIED CATALYSIS A-GENERAL | 2008年 / 343卷 / 1-2期

关键词：

preferential CO oxidation; platinum; alkali metal ions; potassium; presence of H-2;

D O I：

10.1016/j.apcata.2008.03.030

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：

In preferential CO oxidation in H-2-rich stream (PROX), the additive effect of potassium on Pt catalysts was more remarkable over Al2O3 than over SiO2, ZrO2, Nb2O5 and TiO2. The additive effect of potassium to Pt/Al2O3 was more effective than other alkali metals. Especially, the presence of H-2 drastically promoted CO oxidation over Pt/Al2O3 modified with potassium. On the other hand, the suppressing effect of steam on the PROX was more significant over K-Pt/Al2O3 than over Pt/Al2O3, although the PROX activity of K-Pt/Al2O3 was much higher than that of Pt/Al2O3 even under the presence of steam. The different effect of steam addition to the PROX over K-Pt/Al2O3 Suggests that the active site can be Pt surface modified with potassium ions. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：117 / 124

页数：8

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