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This work investigates the regeneration of S-poisoned Pd/Al 2 O 3 and Pd/CeO 2 /Al 2 O 3 catalysts under different CH 4 containing atmospheres. Under lean combustion conditions in the presence of excess O 2 , partial regeneration took place for both systems only above 750°C after decomposition of stable sulphate species adsorbed on the support. Under alternate lean combustion/CH 4 -reducing pulse regeneration is markedly anticipated down to 550-600°C. Experiments evidenced an effective role of ceria in preventing PdO from sulphation and in promoting regeneration via sulphates decomposition under reducing conditions.

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