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RESEARCH PRODUCT
Combined CO/CH4 oxidation tests over Pd/Co3O4 monolitic catalyst: effects of high reaction temperature and SO2 exposure on the deactivation process
Giulio DeganelloLeonarda F. LiottaG. Di CarloGiuseppe PantaleoAnna Maria VeneziaM. PidriaE. Merlone Borlasubject
Process Chemistry and TechnologyInorganic chemistrySinteringHeterogeneous catalysisDecompositionCatalysisMethaneCatalysischemistry.chemical_compoundchemistryAnaerobic oxidation of methaneOxidizing agentGeneral Environmental ScienceCarbon monoxidedescription
Abstract CO and CH 4 combined oxidation tests were performed over a Pd (70 g/ft 3 )/Co 3 O 4 monolithic catalyst in conditions of GHSV = 100,000 h −1 and feed composition close to that of emission from bi-fuel vehicles. The effect of SO 2 (5 ppm) on CO and CH 4 oxidation activity under lean condition ( λ = 2) was investigated. The presence of sulphur strongly deactivated the catalyst towards methane oxidation, while the poisoning effect was less drastic in the oxidation of CO. Saturation of the Pd/Co 3 O 4 catalytic sites via chemisorbed SO 3 and/or sulphates occurred upon exposure to SO 2 . A treatment of regeneration to remove sulphate species was attempted by performing a heating/cooling cycle up to 900 °C in oxidizing atmosphere. Decomposition of PdO and Co 3 O 4 phases at high temperature, above 750 °C, was observed. Moreover, sintering of Pd 0 and PdO particles along with of CoO crystallites takes place.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-09-01 |