The effect of oxide dopants in ceria on n-butane oxidation

被引：51

作者：

Zhao, S ^{[1
]}

Gorte, RJ ^{[1
]}

机构：

[1] Univ Penn, Dept Chem Engn, Philadelphia, PA 19104 USA

来源：

APPLIED CATALYSIS A-GENERAL | 2003年 / 248卷 / 1-2期

关键词：

ceria; doped ceria; butane oxidation; ionic conductivity; samaria; gadolinia; lanthana; niobia; praeseodymia; tantala;

D O I：

10.1016/S0926-860X(03)00102-9

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：

Solid solutions of CeO2 with Yb2O3, Y2O3, Sm2O3, Gd2O3, La2O3, Nb2O5, Ta2O5, and Pr6O11 were prepared by sol-gel methods. All of the samples exhibited a single, cubic phase in X-ray diffraction and the lattice parameters were consistent with formation of the solid solutions. Surprisingly, all of the mixed oxides exhibited a much lower catalytic activity for n-butane oxidation than that of pure CeO2 at 650 K, with SM0.2CC0.8O1.9, Gd0.2Ce0.8O1.9, La0.2Ce0.8O1.9, Nb-0.1 Ce0.9O2.05, and Ta-0.1 Ce0.9O2.05 showing rates less than 10(-2) that of pure ceria. Lower dopant levels with Sm+3 and Gd+3 affected the rates proportionately less. The implications of these results for use of ceria as an oxidation catalyst are discussed. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：9 / 18

页数：10

共 41 条

[21]

Narula CK, 1998, MATER RES SOC SYMP P, V497, P15

[22] New ceria-based catalysts for pollution abatement [J].