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学科主题物理化学
IrFeOx/SiO2 — A highly active catalyst for preferential CO oxidation in H2
张万生; 王爱琴; 刘阔; 王晓东; 张涛
会议名称2008 International Hydrogen Forum
会议日期2008-8-3
2008-08-03
会议地点China
页码54/1
部门归属十五室
主办者Tsinghua University
摘要A novel bifunctional catalyst IrFeOx/SiO2, which is very active and selective for preferential oxidation of CO under H2-rich atmosphere, has been developed in this study. The CO conversion and CO2 selectivity of IrFeOx/SiO2 were much higher than Iridium singly supported on silicon dioxide in a wide temperature range (80~140℃). The IrFeOx/SiO2 and Ir/SiO2 samples were characterized by XRD, H2-TPR, Chemisorption and In-situ DRIFTS. The results of XRD characterization indicated that both FeOx and Ir species were highly dispersed on SiO2 support. The reduction of Ir species on Fe/SiO2 became easier than that on SiO2, together with the partial reduction of Fe2O3, testified by the characterization result of H2-TPR. Chemisorption analysis demonstrated that the saturation uptake of CO or H2 adsorption on the IrFeOx/SiO2 catalyst became fewer than on the Ir/SiO2. The addition of Fe caused the great enhancement of the saturation uptake of O2 adsorption on the IrFeOx/SiO2 catalyst. It was demonstrated that the structure of IrFeOx/SiO2 catalyst improved the O2 adsorption and activation on the FeOx species, while did not interfere with metallic Ir sites moderately exposed on the surface and accessible for CO adsorption. Thus, a non-competitive adsorption catalytic mechanism has been proposed where CO adsorbed on Ir sites and O2 adsorbed on FeOx sites; the reaction may take place at the interface of Ir and FeOx or via a spill-over process. In addition, the effect of CO2 on the catalytic activity of IrFeOx/SiO2 was also investigated in order to evaluate the steady performance of IrFeOx/SiO2 catalyst.
语种中文
文献类型会议论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/112972
专题中国科学院大连化学物理研究所
通讯作者张涛
推荐引用方式
GB/T 7714
张万生,王爱琴,刘阔,等. IrFeOx/SiO2 — A highly active catalyst for preferential CO oxidation in H2[C],2008:54/1.
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