期刊
APPLIED CATALYSIS A-GENERAL
卷 352, 期 1-2, 页码 214-222出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2008.10.008
关键词
Water gas shift; Pt catalyst; Pd catalyst; Perovskite oxide; Synergistic effect; Lattice oxygen
The water gas shift (WGS) reaction over Pt and Pd catalysts supported on various perovskite oxides has been investigated at 573 K without catalyst pretreatment. The Pt and Pd catalysts on LaCoO(3) support showed high catalytic activity. Interaction between Pt or Pd and the support is considered to promote the WGS reaction: Pt/LaCoO(3) had high initial activity but deactivated immediately: Pd/LaCoO(3) was less active than Pt/LaCoO(3), but had superior stability. Catalysts were characterized using XRD, STEM, XPS, and H(2)-temperature programmed reduction (TPR). Results of this study showed that reduction of the support decreased the CO conversion on Pt/LaCoO(3). On the other hand, Pd/LaCoO(3) showed stable activity for the WGS reaction. Therefore, Pd was added to Pt/LaCoO(3) for stabilizing the catalyst activity, and 0.5 wt.% Pd/1 wt.% Pt/LaCoO(3) catalyst showed higher activity and stability. (C) 2008 Elsevier B.V. All rights reserved.
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