OBSERVATION OF THE STRUCTURAL-CHANGE IN THE NB SITES DURING ETHANOL DEHYDRATION ON A SIO2-ATTACHED NB DIMER CATALYST BY EXAFS

被引：12

作者：

ICHIKUNI, N ^{[1
]}

IWASAWA, Y ^{[1
]}

机构：

[1] UNIV TOKYO,GRAD SCH SCI,DEPT CHEM,BUNKYO KU,TOKYO 113,JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1994年 / 98卷 / 44期

关键词：

D O I：

10.1021/j100095a045

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：

The Nb dimers attached on SiO2 were prepared by using the dimeric complex [Nb(eta(5)-C5H5)H-mu-(eta(5),eta(1)- C5H4)](2) as precursor. The surface Nb structure was characterized by EXAFS and XANES to possess the monomer-pair structure without Nb-Nb bonding. It was suggested that the catalytic ethanol dehydration on the monomer-pair catalyst proceeds in conjunction with the structure change of the Nb sites involving a formation-break cycle of Nb-Nb bonds, that is, a reversible monomer-dimer transformation. The catalytic performance is compared with that of the Nb dimers on SiO2 previously reported.

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页码：11576 / 11581

页数：6

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