Effect of yttrium addition on water-gas shift reaction over CuO/CeO2 catalysts
来源期刊：Journal of Rare Earths2009年第3期
论文作者：佘育生 李雷 詹瑛瑛 林性贻 郑起 魏可镁
文章页码：411 - 417
摘 要：This paper presented a study on the role of yttrium addition to CuO/CeO2 catalyst for water-gas shift reaction. A single-step co-precipitation method was used for preparation of a series of yttrium doped CuO/CeO2 catalysts with yttrium content in the range of 0-5wt.%. Properties of the obtained samples were characterized and analyzed by X-ray diffraction（XRD） ,Raman spectroscopy,H2-TPR,cyclic voltammetry（CV） and the BET method. The results revealed that catalytic activity was increased with the yttrium content at first,but then decreased with the further increase of yttrium content. Herein,CuO/CeO2 catalyst doped with 2wt.% of yttrium showed the highest catalytic activity（CO conversion reaches 93.4% at 250 °C） and thermal stability for WGS reaction. The catalytic activity was correlated with the surface area,the area of peak γ of H2-TPR profile（i.e.,the reduction of surface copper oxide（crystalline forms） interacted with surface oxygen vacancies on ceria） ,and the area of peak C2 and A1（Cu0Cu2+ in cyclic voltammetry process） ,respectively. Besides,Raman spectra provided evidences for a synergistic Cu-Ovacancy interaction,and it was indicated that doping yttrium may facilitate the formation of oxygen vacancies on ceria.
佘育生，李雷，詹瑛瑛，林性贻，郑起，魏可镁
摘 要：This paper presented a study on the role of yttrium addition to CuO/CeO2 catalyst for water-gas shift reaction. A single-step co-precipitation method was used for preparation of a series of yttrium doped CuO/CeO2 catalysts with yttrium content in the range of 0-5wt.%. Properties of the obtained samples were characterized and analyzed by X-ray diffraction（XRD） ,Raman spectroscopy,H2-TPR,cyclic voltammetry（CV） and the BET method. The results revealed that catalytic activity was increased with the yttrium content at first,but then decreased with the further increase of yttrium content. Herein,CuO/CeO2 catalyst doped with 2wt.% of yttrium showed the highest catalytic activity（CO conversion reaches 93.4% at 250 °C） and thermal stability for WGS reaction. The catalytic activity was correlated with the surface area,the area of peak γ of H2-TPR profile（i.e.,the reduction of surface copper oxide（crystalline forms） interacted with surface oxygen vacancies on ceria） ,and the area of peak C2 and A1（Cu0Cu2+ in cyclic voltammetry process） ,respectively. Besides,Raman spectra provided evidences for a synergistic Cu-Ovacancy interaction,and it was indicated that doping yttrium may facilitate the formation of oxygen vacancies on ceria.
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