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SULFUR POISONING, RECOVERY AND RELATED PHENOMENA OVER SUPPORTED PALLADIUM, RHODIUM AND IRIDIUM CATALYSTS FOR METHANE OXIDATION

被引：55
作者：
DENG, YQ
NEVELL, TG
EWEN, RJ
HONEYBOURNE, CL
JONES, MG
机构：
[1] UNIV PORTSMOUTH,DEPT CHEM,PORTSMOUTH PO1 2DT,ENGLAND
[2] UNIV W ENGLAND,DEPT SCI,BRISTOL BS16 1QY,ENGLAND
[3] CITY TECHNOL CTR,PORTSMOUTH PO6 1SZ,ENGLAND
来源：
APPLIED CATALYSIS A-GENERAL | 1993年 / 101卷 / 01期
关键词：
GAS SENSOR; METHANE OXIDATION; PELLISTOR; SUPPORTED NOBLE METAL CATALYSTS; SULFUR POISONING;
D O I：
10.1016/0926-860X(93)80137-F
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：
Sulfur inhibition and poisoning of supported palladium, rhodium and iridium catalysts for methane oxidation in air (350-600-degrees-C) have been investigated. All catalysts were affected substantially, but differed in both reduction of activity and subsequent recovery. Above 500-degrees-C, iridium showed reduced inhibition after being partially poisoned. At low temperatures, oxidation of H2S and accompanying oscillatory behaviour were observed. Sulphate (S6+) was detected by X-ray photoelectron spectroscopy on poisoned catalysts, and amounts decreased with increasing temperature. Observed charge transfer from palladium, rhodium and iridium is attributed to interactions with sulfate. The influence of adsorbed sulfate species on the catalysts' performance is considered.
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页码：51 / 62
页数：12
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