IN-SITU ELLIPSOMETRIC STUDY OF A PALLADIUM CATALYST DURING THE OXIDATION OF METHANE

Citation
D. Koni et al., IN-SITU ELLIPSOMETRIC STUDY OF A PALLADIUM CATALYST DURING THE OXIDATION OF METHANE, Catalysis letters, 29(3-4), 1994, pp. 329-338
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
1011-372X
Volume
29
Issue
3-4
Year of publication
1994
Pages
329 - 338
Database
ISI
SICI code
1011-372X(1994)29:3-4<329:IESOAP>2.0.ZU;2-7
Abstract
Ellipsometry is used to follow the growth of a PdO layer on the surfac e of a thick Pd-film catalyst during methane oxidation at approximatel y 500-degrees-C. The oxide layer that develops under rich conditions ( excess CH4) is quite porous and roughnes with time. Little CO is forme d during this period, but the CO2 formation rate increases until spont aneous oscillations develop, which correlate with changes in the ellip sometric data. These changes indicate that the porous oxide rapidly co nverts to a metal-rich state, which has decreased catalytic activity, and then slowly reoxidizes.