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学科主题: 物理化学
题名: The reactivity of Pt-Ni bimetellic catalysts modulated by alternating H2-O2 program
作者: Mu RT(慕仁涛) ;  Fu Q(傅强) ;  Guo XG(郭晓光) ;  Tan DL(谭大力) ;  Bao XH(包信和)
会议文集: Abstract Book
会议名称: International Conference on Clean Energy Science 2011
会议日期: 2011-4-10
出版日期: 2011
会议地点: 大连
通讯作者: XinheBao
出版者: 待补充
出版地: 待补充
合作性质: 墙报
部门归属: 502组
主办者: 大连化物所
摘要: Over Ni/Pt (111) model catalysts, the reversible changes of surface structures are observed under the alternating reductive and oxidative (redox) atmospheres at 800 K, where the Pt-skin surface and NiOX over-layers on Pt (111) surface forming in the redox program. Undergoing low temperature reduction (LTR), NiOX over-layers can be reduced to surface metallic Ni. Three configurable surfaces, Pt-skin surface with subsurface Ni (Pt/Ni/Pt(111)), NiOX over-layers on Pt (111) surface (NiOX/Pt(111)) and surface metallic Ni (Ni/Pt(111)) are modulated via high temperature reduction (HTR), high temperature oxidation (HTO) and LTR. This provides a potential way to prepare specific structure of supported Pt-Ni nanoparticles (NPs). The similar oscillation of surface and bulk structures of Pt0.5Ni0.5 NPs is confirmed by means of combined XPS, in-situ XRD and XAFS techniques during alternating redox program. Furthermore, CO oxidation reactivity of supported Pt0.5Ni0.5 catalysts is examined after the treatment of alternating redox program. Pt@NiO core-shell NPs formed after oxidation, performing low CO oxidation reactivity. While in the reductive treatment, Pt rich surface with the subsurface Ni was the thermodynamically stable structure, which had better catalytic reactivity and provided the opportunity to reversible fabricate Pt rich surface and Pt@NiO core-shell NPs during redox program. Consistent with the model systems, surface active Ni species on Pt NPs was produced at lower reductive temperature, which showing best reactivity.
英文摘要: Over Ni/Pt (111) model catalysts, the reversible changes of surface structures are observed under the alternating reductive and oxidative (redox) atmospheres at 800 K, where the Pt-skin surface and NiOX over-layers on Pt (111) surface forming in the redox program. Undergoing low temperature reduction (LTR), NiOX over-layers can be reduced to surface metallic Ni. Three configurable surfaces, Pt-skin surface with subsurface Ni (Pt/Ni/Pt(111)), NiOX over-layers on Pt (111) surface (NiOX/Pt(111)) and surface metallic Ni (Ni/Pt(111)) are modulated via high temperature reduction (HTR), high temperature oxidation (HTO) and LTR. This provides a potential way to prepare specific structure of supported Pt-Ni nanoparticles (NPs). The similar oscillation of surface and bulk structures of Pt0.5Ni0.5 NPs is confirmed by means of combined XPS, in-situ XRD and XAFS techniques during alternating redox program. Furthermore, CO oxidation reactivity of supported Pt0.5Ni0.5 catalysts is examined after the treatment of alternating redox program. Pt@NiO core-shell NPs formed after oxidation, performing low CO oxidation reactivity. While in the reductive treatment, Pt rich surface with the subsurface Ni was the thermodynamically stable structure, which had better catalytic reactivity and provided the opportunity to reversible fabricate Pt rich surface and Pt@NiO core-shell NPs during redox program. Consistent with the model systems, surface active Ni species on Pt NPs was produced at lower reductive temperature, which showing best reactivity.
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/116122
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:
Mu RT,Fu Q,Guo XG,et al. The reactivity of Pt-Ni bimetellic catalysts modulated by alternating H2-O2 program[C]. 见:International Conference on Clean Energy Science 2011. 大连. 2011-4-10.
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