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学科主题: 物理化学
题名: IrFeOx/SiO2 — A highly active catalyst for preferential CO oxidation in H2
作者: Zhang WS(张万生) ;  Wang AQ(王爱琴) ;  Liu K(刘阔) ;  Wang XD(王晓东) ;  Zhang T(张涛)
会议名称: 2008 International Hydrogen Forum
会议日期: 2008-8-3
出版日期: 2008-08-03
会议地点: China
通讯作者: 张涛
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
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/112972
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Zhang WS,Wang AQ,Liu K,et al. IrFeOx/SiO2 — A highly active catalyst for preferential CO oxidation in H2[C]. 见:2008 International Hydrogen Forum. China. 2008-8-3.
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