6533b7d4fe1ef96bd1262884
RESEARCH PRODUCT
Pd and PdAu on mesoporous silica for methane oxidation: Effect of SO2
Giuseppe PantaleoAnna Maria VeneziaR. MuraniaGiulio Deganellosubject
inorganic chemicalsChemistryInorganic chemistrychemistry.chemical_elementMesoporous silicaHeterogeneous catalysisCatalysisCatalysisTransition metalAnaerobic oxidation of methaneThermal stabilityPhysical and Theoretical ChemistryIncipient wetness impregnationPalladiumdescription
Abstract Palladium and gold–palladium catalysts supported on mesoporous silica were prepared by incipient wetness impregnation. They were characterized by XPS, XRD, BET, and FTIR acidity measurements. The activity was tested in the oxidation of methane under lean conditions. The effect of adding SO 2 to the reactant mixture was investigated. Test reactions were consecutively performed to evaluate the thermal stability and poisoning reversibility. The palladium catalyst performed quite well in terms of the light-off temperature ( T 50 300 °C) and SO 2 tolerance. Moreover, the activity, which decreased after a night treatment in SO 2 at 350 °C, was completely recovered in subsequent cycles. The presence of gold decreased the activity slightly without altering the SO 2 tolerance. Evidence of a dynamic reduction–oxidation process occurring at the palladium surface was obtained from the gold-promoted sample in which the reduction of palladium on SO 2 treatment was ascertained.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-10-01 | Journal of Catalysis |