Oxidation of Carbon Monoxide Over Ceria and Alumina Supported Palladium Catalysts
Palladium catalysts on both Al2O3 and CeO2, supports were studied for efficacy in low temperature carbon monoxide oxidation. Calcination temperatures were varied between 500-900°C for alumina supported catalysts and shown to have no significant difference in activity. X-Ray Photoelectron Spectroscopy studies revealed structural changes associated with palladium states and reacted catalysts and displayed a change from palladium oxide (PdO) to native palladium oxide (PdOx) and elemental palladium (Pd). Activity studies were conducted on all catalysts synthesized and indicated that Pd/Al2O3 achieved 100% CO conversion at 150°C when calcined at 500°C and pretreated with reduction process. Pd/CeO2 showed higher activity and achieved 100% CO conversion at 80°C. Stochiometric mixtures of CO and O2 as well as excess oxygen resulted in higher conversion CO.
Palladium Catalysts, Al2O3, CeO2, Efficacy, Palladium Oxide, PdO, Chemistry, Inorganic Chemistry
Networked Digital Library of Theses and Dissertations