Formation of highly concentrated hydrogen through methane decomposition over Pd-based alloy catalysts

被引：84

作者：

Ogihara, H

Takenaka, S

Yamanaka, I

Tanabe, E

Genseki, A

Otsuka, K

机构：

[1] Tokyo Inst Technol, Dept Appl Chem, Grad Sch Sci & Engn, Meguro Ku, Tokyo 1528552, Japan

[2] Western Hiroshima Prefecture Ind Inst, Hiroshima 7390046, Japan

[3] Tokyo Inst Technol, Ctr Adv Mat Anal, Meguro Ku, Tokyo 1528552, Japan

来源：

JOURNAL OF CATALYSIS | 2006年 / 238卷 / 02期

关键词：

Pd-based alloy catalysts; pure hydrogen; carbon nanofibers; Pd-Co alloys;

D O I：

10.1016/j.jcat.2005.12.024

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：

Highly concentrated hydrogen and carbon nanofibers were produced through methane decomposition in a temperature range of 973-1123 K. Pd-based alloys containing Ni, Co, Rh, or Fe showed high catalytic activity and tong life for methane decomposition at 973 K. In particular, Pd-Co/Al2O3 and Pd-Ni/Al2O3 showed the highest hydrogen yield at reaction temperatures above 973 K among all the catalysts tested. Highly concentrated hydrogen (> 94 vol%) was formed by methane decomposition over Pd-Co/Al2O3 at 1123 K. SEM images of catalysts [M/Al2O3 (M = Fe, Co, Ni, and Pd) and Pd-M/Al2O3 (M = Fe, Co, Ni, Cu, Ag, and Rh)] after methane decomposition showed the formation of carbons with fibrous structure. In addition, TEM images of Pd-Co/Al2O3 at the initial stage of reaction showed that Pd-Co alloy particles formed carbons from several facets, whereas Co or Pd metal particles formed carbon nanofibers from one facet. This would be one reason why Pd-Co alloy catalysts showed high activity and long life for methane decomposition at high temperatures. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：353 / 360

页数：8

共 24 条

[1] On the structural characteristics of γ-alumina-supported Pd-Cu bimetallic catalysts [J].