Oxygen non-stoichiometry and reducibility of B-site substituted lanthanum manganites

被引：40

作者：

Patcas, F ^{[1
]}

Buciuman, FC ^{[1
]}

Zsako, J ^{[1
]}

机构：

[1] Univ Babes Bolyai, Dept Chem & Chem Engn, R-3400 Cluj Napoca, Romania

来源：

THERMOCHIMICA ACTA | 2000年 / 360卷 / 01期

关键词：

catalyst; lanthanum manganite; perovskite; non-stoichiometry; TPR;

D O I：

10.1016/S0040-6031(00)00532-3

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

LaMn0.8B'O-0.2(3+delta) (B'=Ni, Zn, Cu) and LaMn0.5Cu0.5O3+delta perovskites were studied by temperature programmed reduction (TPR). Oxygen non-stoichiometry of the perovskite samples calcined in air (Po-2=0.21 bar) at 750 degrees C decreased upon Zn2+ (delta=0.03), Cu2+ (delta=0.04) and Ni-3 (delta=0.08) substitution as compared to LaMnO3.16. LaMn0.5Cu0.5O3+delta had reductive non-stoichiometry and contained low amounts of La2CuO4 and CuO. The reducibility at low and mean temperatures (t<500 degrees C) increased in the sequence (Mn, Ni)approximate to(Mn, Zn)<Mn<(Mn, Cu). (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：71 / 76

页数：6

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