Planar defect of the nano-structured zinc oxide as the site for stabilization of the copper active species in Cu/ZnO catalysts

被引：37

作者：

Khassin, AA ^{[1
]}

Pelipenko, VV ^{[1
]}

Minyukova, TP ^{[1
]}

Zaikovskii, VI ^{[1
]}

Kochubey, DI ^{[1
]}

Yurieva, TM ^{[1
]}

机构：

[1] Boreskov Inst Catalysis, Novosibirsk 630090, Russia

来源：

CATALYSIS TODAY | 2006年 / 112卷 / 1-4期

关键词：

Cu/ZnO catalyst; methanol synthesis; planar defect in oxides; high-resolution electron microscopy; EXAFS spectroscopy;

D O I：

10.1016/j.cattod.2005.11.047

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The catalytic activity of CuZn catalysts in the synthesis of methanol is related to those reduced Cu species, which originate from the CuxZn1-xO solid solution of wurtzite-like structure. Copper cations in the CuxZn1-xO solid solution are localized in the extended stacking faults of the ZnO lattice. Copper sites could be supposedly described as the product of introducing (OH)center dot center dot center dot Cu center dot center dot center dot(OH) to the planar defects of zinc oxide structure. Hydroxyl groups stabilize the planar defects of ZnO. The process of the samples reduction leads to the formation of flat Cu-0 particles over the surface of zinc oxide. The planar defects of ZnO structure are preserved in the reduced state. During the reoxidation, copper atoms return back to the extended stacking faults of ZnO as the tape-like clusters of flat-square coordinated copper cations. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：143 / 147

页数：5

共 11 条

[1]

Frantsevich I.I., 1963, High-Temperature Reduction of Metals and Alloys, P19

[2] In situ investigations of structural changes in Cu/ZnO catalysts [J].