Oscillatory behaviour of catalytic properties, structure and temperature during the catalytic partial oxidation of methane on Pd/Al2O3

B. Kimmerle, A. Baiker, Jan-Dierk Grunwaldt

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Pd/Al2O3 catalysts showed an oscillatory behaviour during the catalytic partial oxidation (CPO) of methane, which was investigated simultaneously by IR-thermography, X-ray absorption spectroscopy, and online mass-spectrometry to correlate the temperature, state of the catalyst and catalytic performance. The following stages were observed: (i) build-up of a temperature maximum in the first half of the catalyst bed, (ii) reduction of palladium in the end zone of the catalyst bed with a front moving toward the entrance zone, (iii) strong hot spot formation accompanied by reduction of palladium due to self-reduction leading to extinction of the process. The latter was the key driver for the oscillations and thus gave additional insight into the mechanism of partial methane oxidation.
Original languageEnglish
JournalPhysical Chemistry Chemical Physics
Volume12
Issue number10
Pages (from-to)2288-2291
ISSN1463-9076
DOIs
Publication statusPublished - 2010

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