Catalysis Letters, Vol.64, No.2-4, 125-128, 2000
SnO2-supported palladium catalysts: activity in deNOx at low temperature
High surface area tin dioxide (174 m(2)/g) has been synthetised and characterised by XRD, TEM and UV-visible DRS. DRS gives evidence for the formation of oxygen vacancies (donor levels) under reducing conditions. CO adsorption gives rise to terminal carbonyl species linked to Sn4+ and Sn2+. Palladium-tin oxide catalysts have been prepared from various precursors (Pd(acac)(2) and Pd(NO3)(2) ) and by different preparation methods (grafting, photodeposition); they are active in deNOx reactions at low temperature (180 C-degrees) in the presence of stoichiometric CO-NO-O-2 mixtures. A mechanism involving palladium and oxygen vacancies is proposed.