OSCILLATIONS OF CO AND CO+H-2 OXIDATION IN AIR OVER SUPPORTED AND UNSUPPORTED PT CATALYSTS

被引：6

作者：

DENG, YQ

NEVELL, TG

JONES, MG

机构：

[1] UNIV PORTSMOUTH,DEPT CHEM,PORTSMOUTH PO1 2DT,HANTS,ENGLAND

[2] CITY TECHNOL LTD,PORTSMOUTH PO6 1SZ,HANTS,ENGLAND

来源：

CATALYSIS LETTERS | 1995年 / 34卷 / 3-4期

关键词：

OSCILLATION; CO + H-2 COOXIDATION; CHEMICAL SENSOR; PELLISTOR; PLATINUM; PLATINUM ALUMINA;

D O I：

10.1007/BF00806880

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：

Oscillation behaviour of the oxidation of CO (0.2-2.2%) in air over Pt wire coils and over Pt/Al2O3 catalysts deposited onto the coils (pellistors) has been investigated. The waveforms differ considerably between the two catalytic systems. Over unsupported Pt at 240-260 degrees C, regular oscillations were accompanied by slowly declining activity and by deposition of carbon. Over supported Pt at 110-180 degrees C, relatively complex but sustained oscillation occurred by a different mechanism. This oscillation was greatly enhanced by H-2 (0.25-1.0%), and may involve fluctuations in the concentrations of CO and H-2 around the supported catalyst.

引用

页码：313 / 320

页数：8

共 35 条

[1]

BOLDREVA NA, 1993, 10TH P INT C CAT BUD, P2621

[2] STUDIES ON SELF-SUSTAINED REACTION-RATE OSCILLATIONS .2. THE ROLE OF CARBON AND OXIDES IN THE OSCILLATORY OXIDATION OF CARBON-MONOXIDE ON PLATINUM [J].