In-situ polarization-dependent total-reflection fluorescence XAFS studies on the structure transformation of Pt clusters on alpha-Al2O3(0001)

被引:41
作者
Asakura, K
Chun, WJ
Shirai, M
Tomishige, K
Iwasawa, Y
机构
[1] UNIV TOKYO,GRAD SCH ENGN,DEPT APPL CHEM,BUNKYO KU,TOKYO 113,JAPAN
[2] TOHOKU UNIV,INST CHEM REACT SCI,SENDAI,MIYAGI 98077,JAPAN
[3] UNIV TOKYO,GRAD SCH ENGN,DEPT CHEM,BUNKYO KU,TOKYO 113,JAPAN
[4] UNIV TOKYO,FAC SCI,RES CTR SPECTROCHEM,BUNKYO KU,TOKYO 113,JAPAN
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 28期
关键词
D O I
10.1021/jp970394p
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Structures of Pt species derived from Pt-4(mu-CH3COO)(8) on an alpha-Al2O3(0001) single-crystal surface were studied by means of in-situ polarization-dependent total reflection fluorescence XAFS (EXAFS and XANES) techniques. The Pt-4 cluster framework was destroyed upon the deposition of Pt-4(mu-CH3COO)(8) by the reaction on the alpha-Al2O3 surface at room temperature. The isolated Pt species were converted to one-atomic layer thick Pt rafts with the Pt-Pt distance of 0.273 nm when the cluster was treated with H-2 at 373 K. The raftlike Pt clusters were stabilized by the formation of direct Pt-O-Al bonding with the alpha-Al2O3 surface. The raftlike Pt clusters were redispersed to isolated oxidized Pt species by the reaction with NO. They were also transferred to three-dimensional Pt particles by reduction with H-2 at 773 K.
引用
收藏
页码:5549 / 5556
页数:8
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