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Characterization and catalysis of a SiO2-supported [Au6Pt] cluster [(AuPPh3)(6)Pt(PPh3)](2+)/SiO2

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Characterization and catalysis of a SiO2-supported [Au6Pt] cluster [(AuPPh3)(6)Pt(PPh3)](2+)SiO2.htm (413bytes)
Date
1998-03-20
Author
Yuan, YZ
袁友珠
Asakura, K
Wan, HL
万惠霖
Tsai, KR
蔡启瑞
Iwasawa, Y
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  • 化学化工-已发表论文 [14235]
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Abstract
Structures 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.
Citation
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,1997,122(2-3):147-157
URI
http://dx.doi.org/10.1016/S1381-1169(97)00004-6
https://dspace.xmu.edu.cn/handle/2288/13485

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