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

Authors
DENG YQ NEVELL TG JONES MG
Citation
Yq. Deng et al., OSCILLATIONS OF CO AND CO-2 OXIDATION IN AIR OVER SUPPORTED AND UNSUPPORTED PT CATALYSTS(H), Catalysis letters, 34(3-4), 1995, pp. 313-320
Citations number
37
Categorie Soggetti
Chemistry Physical
Journal title
Catalysis letters → ACNP
ISSN journal
1011372X
Volume
34
Issue
3-4
Year of publication
1995
Pages
313 - 320
Database
ISI
SICI code
1011-372X(1995)34:3-4<313:OOCACO>2.0.ZU;2-1
Abstract
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 (pell istors) has been investigated. The waveforms differ considerably betwe en the two catalytic systems. Over unsupported Pt at 240-260 degrees C , regular oscillations were accompanied by slowly declining activity a nd by deposition of carbon. Over supported Pt at 110-180 degrees C, re latively complex but sustained oscillation occurred by a different mec hanism. 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 th e supported catalyst.