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学科主题: 物理化学
题名: The reactivity of PtNi bimetallic catalyst: from model systems to supported catalysts
作者: Mu RT(慕仁涛) ;  Fu Q(傅强) ;  Zhang H(张辉) ;  Wang CF(王传付) ;  Xu H(徐红) ;  Zhai RS(翟润生) ;  Tan DL(谭大力) ;  Bao XH(包信和)
会议名称: 18th International Vacuum Congress
会议日期: 2010-8-23
出版日期: 2010-08-23
会议地点: 中国
通讯作者: 包信和
部门归属: 五室
主办者: 中国真空学会
摘要: Various Ni-Pt(111) model surfaces were constructed in a well-defined way by using molecular beam epitaxy (MBE), which include metallic Ni on Pt(111) - Ni/Pt(111), Ni oxide nanoislands on Pt(111) - NiO1-x/Pt (111), Pt-skin surface with subsurface Ni - Pt/Ni/Pt(111), and sandwich-like NiO1-x/Pt/Ni/Pt (111) surface consisting of surface Ni oxide nanoislands and subsurface Ni at Pt(111). In-situ ultraviolet photoelectron spectroscopy (UPS) investigations show that the sandwich-like NiO1-x/Pt/Ni/Pt (111) surface presents the highest reactivity to CO oxidation, in which surface Ni oxide nanoislands activate O2 dissociative adsorption and subsurface Ni species promote CO oxidation with O. The similar sandwich-like surface structure was obtained in Pt-Ni nanoparticles supported on carbon black (CB) and highly orientated pyrolyitc graphite (HOPG) surfaces. By reducing the Pt-Ni catalysts at intermediate temperature, such as 523 K, part of Ni diffuses into the subsurface region and the left remains on the surface, which transforms to the sandwich-like Pt-Ni nanoparticles, NiO1-x/Pt/Ni/Pt, in the oxidative atmosphere. The catalytic test for CO oxidation in O2 shows that the performance of this catalyst is better than those reduced at lower or higher temperatures. The structure-activity relationship found in the real catalyst systems is consistent with the surface science data using the model systems.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/114308
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,Zhang H,et al. The reactivity of PtNi bimetallic catalyst: from model systems to supported catalysts[C]. 见:18th International Vacuum Congress. 中国. 2010-8-23.
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