Structure and catalytic combustion activity of atomically dispersed Pt species at MgO surface

被引：97

作者：

Asakura, K

Nagahiro, H

Ichikuni, N

Iwasawa, Y ^{[1
]}

机构：

[1] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, Grad Sch Sci, Res Ctr Spectrochem, Bunkyo Ku, Tokyo 1130033, Japan

来源：

APPLIED CATALYSIS A-GENERAL | 1999年 / 188卷 / 1-2期

关键词：

magnesium oxide support; Pt species;

D O I：

10.1016/S0926-860X(99)00247-1

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：

We have investigated the structure of Pt(A)/MgO and PtMo6/MgO catalysts which were prepared from Pt(C5H7O2)(2) and [PtMo6O24](8-) followed by calcination, respectively, and their catalytic activities for the propane + O-2 reaction. The Pt(A)/MgO and PtMo6/MgO catalysts with atomically dispersed Pt ions were found to be as active as metallic Pt particles supported on MgO for propane combustion. A distorted spinel-like structure around Pt ion embedded at the MgO surface was proposed for the active Pt species by means of EXAFS. The atomically dispersed Pt structure was reduced with propane at 623 K to form Pt-6 clusters with Pt-O bonding to the MgO support. The Pt cluster chemically attached to the MgO surface was selective for the propane dehydrogenation. Restructuring of the Pt clusters to the atomically dispersed Pt structure was observed by oxidation with O-2 at 623 K. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：313 / 324

页数：12

共 30 条

[1] Synthesis and characterization of model MgO-supported catalysts with Pt-Mo interactions [J].