IrFeOx/SiO2—A highly active catalyst for preferential CO oxidation in H2
IrFeOx/SiO2—A highly active catalyst for preferential CO oxidation in H2
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DOI：
10.1016/j.ijhydene.2009.07.016
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发表时间：
2010-04
影响因子：
7.2
通讯作者：
Wansheng Zhang;Yanqiang Huang;Junhu Wang;Kuo Liu;Xiaodong Wang;Aiqin Wang;Tao Zhang
中科院分区：
文献类型：
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作者：
Wansheng Zhang;Yanqiang Huang;Junhu Wang;Kuo Liu;Xiaodong Wang;Aiqin Wang;Tao Zhang
本研究开发了一种新型的双功能催化剂IrFeOx/SiO2，该催化剂在富氢气氛下对CO的选择性氧化具有很高的活性。采用XRD、H2-TPR和化学吸附等方法对3种不同浸渍顺序制备的IrFeOx/SiO2催化剂进行了表征。结果表明，FeOx和Ir物种在SiO2载体上高度分散; Fe促进的Ir/SiO2催化剂中的Ir物种比Ir/SiO2催化剂中的Ir物种更容易被还原，同时Fe 2 O3部分被还原; O2的饱和吸附量大大提高。采用原位DRIFTS、XPS和穆斯堡尔谱技术对共浸渍法制备的Ir-FeOx/SiO2催化剂进行了结构表征。CO吸附在Ir位上，O2吸附在FeOx位上，反应可能发生在Ir和FeOx的界面上，属于非竞争吸附催化机理.
A novel bifunctional catalyst IrFeOx/SiO2, which was very active and selective for preferential oxidation of CO under H2-rich atmosphere, was developed in this study. XRD, H2-TPR, and chemisorption were applied to characterize three kinds of IrFeOx/SiO2catalysts prepared by different impregnation sequences. The results indicated that both FeOxand Ir species were highly dispersed on the SiO2support; the reduction of Ir species in the Fe-promoted Ir/SiO2catalyst became easier than those in the Ir/SiO2, together with the partial reduction of Fe2O3; the saturation uptake of O2adsorption was greatly enhanced. In-situ DRIFTS, XPS, and Mössbauer techniques were further applied to detect the structural information on the selected Ir-FeOx/SiO2catalyst prepared by co-impregnation method. A non-competitive adsorption catalytic mechanism was proposed where CO adsorbed on Ir sites and O2adsorbed on FeOxsites; the reaction probably took place at the interface of Ir and FeOxor via a spill-over process.