Abstract
Pd and Pt catalysts supported on alumina, tin(IV) oxide and tin(IV) oxide grafted on alumina were prepared, characterised and tested with respect to the low-temperature combustion of methane after reduction in H2 and ageing under reactants at 600°C. In the case of Pd, the use of SnO2 or SnO2-based supports led to catalysts slightly less active than Pd/Al2O3. In contrast, SnO2 was found to strongly promote the oxidation of methane over Pt catalysts with respect to Pt/Al2O3, even after ageing under reactants. When Pt was supported on SnO2 grafted on Al2O3, the activity was found at most similar to or, after ageing, lower than Pt/Al2O3. This negative effect was discussed, being partly related to the sintering of SnO2 under reactants observed by FTIR and XRD.
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