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Regeneration of S-poisoned Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts for the combustion of methane |
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| Authors: | Arosio F. Colussi S. Groppi G. Trovarelli A. |
| Affiliation: | (1) Dipartimento di Chimica, Materiali e ingegneria chimica “G. Natta”, Politecnico di Milano, P.zza Leonardo da Vinci, 32, 20133 Milano, Italy;(2) Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Udine, Via Cotonificio, 108, 33100 Udine, Italy |
| Abstract: | This work investigates the regeneration of S-poisoned Pd/Al2O3 and Pd/CeO2/Al2O3 catalysts under different CH4 containing atmospheres. Under lean combustion conditions in the presence of excess O2, 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/CH4-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. |
| Keywords: | Pd-catalysts CH4 combustion sulphur poisoning catalyst regeneration |
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