Selective CO oxidation in H2-rich gas over K2CO3-promoted Rh/SiO2 catalysts:: effects of preparation method

被引:38
作者
Ito, S [1 ]
Tanaka, H [1 ]
Minemura, Y [1 ]
Kameoka, S [1 ]
Tomishige, K [1 ]
Kunimori, K [1 ]
机构
[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
关键词
rhodium catalyst; potassium carbonate; selective oxidation; carbon monoxide oxidation; hydrogen;
D O I
10.1016/j.apcata.2004.06.047
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 selective CO oxidation in H-2-rich gas over K2CO3-promoted Rh/SiO2 (K2CO3-Rh/SiO2) catalysts was investigated, and the results were compared with those of Rh/SiO2 catalysts. K2CO3-Rh/SiO2 catalysts were able to realize almost complete removal of CO. The additive effect of K2CO3 was dependent on the preparation method and on the K2CO3 amounts. K2CO3-Rh/SiO2 catalyst prepared by the sequential impregnation method with molar ratio K/Rh = 3 exhibited high performance. According to the characterization results, the catalyst had highly dispersed Rh metal particles partially covered with K2CO3. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:295 / 302
页数:8
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