MICROSTRUCTURAL AND SPECTROSCOPIC INVESTIGATIONS OF THE SUPPORTED COPPER ALUMINA OXIDE SYSTEM - NATURE OF AGING IN OXIDIZING REACTION MEDIA

被引：64

作者：

TIKHOV, SF ^{[1
]}

SADYKOV, VA ^{[1
]}

KRYUKOVA, GN ^{[1
]}

PAUKSHTIS, EA ^{[1
]}

POPOVSKII, VV ^{[1
]}

STAROSTINA, TG ^{[1
]}

KHARLAMOV, GV ^{[1
]}

ANUFRIENKO, VF ^{[1
]}

POLUBOYAROV, VF ^{[1
]}

RAZDOBAROV, VA ^{[1
]}

BULGAKOV, NN ^{[1
]}

KALINKIN, AV ^{[1
]}

机构：

[1] ACAD SCI USSR,INST CATALYSIS,PROSPEKT LAVRENTIEVA 5,NOVOSIBIRSK 630090,USSR

来源：

JOURNAL OF CATALYSIS | 1992年 / 134卷 / 02期

关键词：

D O I：

10.1016/0021-9517(92)90338-I

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：

By means of electron microscopy, infrared spectroscopy of adsorbed CO, XPS, and ESR the state of the copper oxide component of the CuAlO system (CuO/γ-Al2O3 and bulk CuAl2O4 catalysts) has been investigated. Several types of copperAloxygen entities were detected on the catalyst surfaces: isolated ions, weak magnetic associates, two- and three-dimensional clusters, defect CuO phase. The dependence of their distribution on composition, preparation, and pretreatment conditions and their reducibility by carbon monoxide have been analyzed. The enthalpy of oxygen adsorption on copper atoms in various structures has been calculated by a semiempirical, interacting-bond method. The most reactive species are three-dimensional clusters reducing to Cu0 by CO even at 163 K. Prolonged treatment in reaction media (CH3OH, CH2O, O2 at 673-873 K) annealed extended defects in CuO particles and destroyed the clusters, forming perfect CuO particles and bulk aluminate. © 1992.

引用

页码：506 / 524

页数：19

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