Characterization and catalytic properties of nanosized cobaltate particles prepared by in situ synthesis inside mesoporous molecular sieves

被引：32

作者：

Makshina, E. V.

Sirotin, S. V.

van den Berg, M. W. E.

Klementiev, K. V.

Yushchenko, V. V.

Maz, G. N.

Gruenert, W.

Romanovsky, B. V.

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia

[2] Ruhr Univ Bochum, Lab Ind Chem, D-44801 Bochum, Germany

来源：

APPLIED CATALYSIS A-GENERAL | 2006年 / 312卷

基金：

俄罗斯基础研究基金会;

关键词：

LaCoO3 mixed oxide; mesoporous molecular sieve MCM-41 type; methanol oxidation;

D O I：

10.1016/j.apcata.2006.06.021

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：

Bulk lanthanum cobaltate (LaCoO3) with perovskite-like structure and LaCoOx supported onto the mesoporous MCM-41 molecular sieve were synthesized by the conventional citrate method. The prepared samples were characterized by XRD, nitrogen BET measurements, H-2-temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), XAFS and SEM-energy-dispersive X-ray (EDX) techniques. The turnover frequency of the supported cobaltate in methanol oxidation is two orders of magnitude larger than that of the bulk perovskite material. Based on the characterization results, it is concluded that the supported cobaltate does not form species of LaCoO3 short-range order in MCM-41. The high activity is related to a highly disordered, oxygen-deficient Co oxide phase, which is probably stabilized by the La ions,present. (C) 2006 Elsevier B.V. All rights reserved.

引用

页码：59 / 66

页数：8

共 27 条

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