IN-SITU X-RAY-ABSORPTION SPECTROSCOPIC STUDY OF A HIGHLY DISPERSED PTSN/AL2O3 CATALYST

被引：27

作者：

CABALLERO, A

DEXPERT, H

DIDILLON, B

LEPELTIER, F

CLAUSE, O

LYNCH, J

机构：

[1] UNSE, CSIC, INST CIENCIA MAT SEVILLA, E-41080 SEVILLE, SPAIN

[2] LAB UTILISAT RAYONNEMENT ELECTROMAGNET, F-91405 ORSAY, FRANCE

[3] INST FRANCAIS PETR, F-92506 RUEIL MALMAISON, FRANCE

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 43期

关键词：

D O I：

10.1021/j100145a028

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 state of platinum in a PtSn/Al2O3 catalyst prepared from organometallic precursors was studied in situ by EXAFS and XANES spectroscopies. While the XANES spectra show that the platinum is completely reduced after treatment in H-2 at 773 K, the results obtained by EXAFS indicate that, besides platinum and tin, oxygen atoms are present in the first coordination shell of platinum, but with a Pt-O distance longer than for platinum oxide (2.24 vs 2.02 angstrom). These findings can be rationalized assuming the formation of a highly dispersed bimetallic platinum-tin phase, which is stabilized on the alumina surface through Pt-O-Sn2+ bonds.

引用

页码：11283 / 11285

页数：3