Oscillations of methane combustion over alumina-supported palladium catalysts under oxygen-deficient conditions

被引：46

作者：

Deng, YQ ^{[1
]}

Nevell, TG

机构：

[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab OSSO, Lanzhou 730000, Peoples R China

[2] Univ Portsmouth, Div Chem, Portsmouth PO1 2DT, Hants, England

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1999年 / 142卷 / 01期

关键词：

oscillations; methane combustion/oxidation; palladium catalyst;

D O I：

10.1016/S1381-1169(98)00286-6

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：

The oxidation of methane over Pd/Al2O3 catalysts in flow systems has been investigated at temperatures in the range 250-600 degrees C and with O-2/CH4 ratios between 0.5 and 10.0. Oscillatory behaviour in the evolution of heat of reaction was observed for mixtures close to the stoichiometric composition. The frequency of oscillation increased with rising temperature. The amplitude also depended on both temperature and feed gas composition, and was greatest under conditions such that the consumption of oxygen was almost complete. The oscillatory behaviour may be attributed to the periodic or aperiodic changes in a Pd-PdOx active phase, modulated by the specific reaction environment at elevated temperature. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：51 / 60

页数：10

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