Auto-reduction of Cu(II) species supported on Al2O3 to Cu(I) by thermovacuum treatment

被引：36

作者：

Amano, F ^{[1
]}

Tanaka, T ^{[1
]}

Funabiki, T ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Engn, Dept Mol Engn, Kyoto 6158510, Japan

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2004年 / 221卷 / 1-2期

关键词：

autoreduction; thermal self-reduction; CuO/Al2O3; Cu-ZSM-5; phosphorescence emission;

D O I：

10.1016/j.molcata.2004.06.014

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 investigated the reduction behavior of Cu2+ species supported on gamma-Al2O3 in vacuo at high temperature by combined use of electron paramagnetic resonance (EPR) detecting highly dispersed Cu2+ species and photoluminescence spectroscopy monitoring isolated Cu+ ions. In the case of low loaded alumina-supported copper catalysts (Cu2+/Al2O3), there are isolated Cu2+ species centered in tetragonal distorted octahedra. It was found that the isolated Cu2+ species are easily reduced to Cu+ ions by thermovacuum treatment for Al2O3-supported catalyst, which are different from the past report for copper exchanged zeolites. On the other hand, the less dispersed Cu2+ species cannot be fully reduced to Cu+ ions in vacuo at 973 K on the alumina surface. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：89 / 95

页数：7

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