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dc.contributor.authorYuan, YZ
dc.contributor.author袁友珠
dc.contributor.authorAsakura, K
dc.contributor.authorWan, HL
dc.contributor.author万惠霖
dc.contributor.authorTsai, KR
dc.contributor.author蔡启瑞
dc.contributor.authorIwasawa, Y
dc.date.accessioned2012-08-14T01:13:22Z
dc.date.available2012-08-14T01:13:22Z
dc.date.issued1998-03-20
dc.identifier.citationJOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,1997,122(2-3):147-157zh_CN
dc.identifier.issn1381-1169
dc.identifier.urihttp://dx.doi.org/10.1016/S1381-1169(97)00004-6
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/13485
dc.description.abstractStructures and catalytic properties of a SiO2-supported [Au6Pt] cluster, [(AuPPh3)(6)Pt(PPh3)](NO3)(2) (1), were characterized by FT-IR, in-situ EXAFS, and TPR, and also by the reactions such as H-2-D-2 equilibration, ethene hydrogenation, and CO oxidation to get insight into the key issues of metal catalysis. The cluster 1 was supported on SiO2 without fragmentation of the cluster framework at room temperature under Ar atmosphere. The cluster framework of 1/SiO2 was stable up to 400 K under vacuum. EXAFS analysis revealed that after heat-treatment of 1/SiO2 at 473 K under vacuum the coordination numbers of Pt-Au and Au-Au(Pt) decreased compared to those for the original clusters due to cluster deformation and after treatment of 1/SiO2 at 773 K the Au particles and Pt-P-# species (P-#: phosphine species) were produced. The combination of TPR and EXAFS showed that the reduction at 603 K caused complete cleavage of Pt-Au and Au-P-# bonds accompanied with the formation of Au particles, while Pt-P-# bonds remained at 773 K. The incipient 1/SiO2 showed catalytic activity in H-2-D-2 and ethene hydrogenation at 303 K without change of the cluster framework. The catalysis of 1/SiO2 was suggested to be referred to the platinum atom which was embedded in the six gold cluster by the results of CO-adsorption, EXAFS, and pulse reaction analysis. This is contrasted to the fact that both Pt(PPh3)(4)/SiO2 and [Au-9(PPh3)(8)](NO3)(3)/SiO2 showed no catalytic activity for these reactions.zh_CN
dc.language.isoenzh_CN
dc.publisherELSEVIER SCIENCE BVzh_CN
dc.subjectsupported bimetallic [Au6Pt] clusterzh_CN
dc.subjectH-2-D-2 equilibration characterization by FT-IRzh_CN
dc.subjectin-situ EXAFS and TPRzh_CN
dc.titleCharacterization and catalysis of a SiO2-supported [Au6Pt] cluster [(AuPPh3)(6)Pt(PPh3)](2+)/SiO2zh_CN
dc.typeArticlezh_CN


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