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
收藏
页码：117 / 124
页数：8
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