Palladium–vanadium interaction in binary supported catalysts

• Published in: Catalysis today 2000-04, Vol.57 (3), p.255-260
• Main Authors: Neyertz, C., Volpe, M.A., Gigola, C.
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts: preparations and properties; Chemistry; Exact sciences and technology; General and physical chemistry; NO decomposition; NO reduction; Pd–VO x/γ-Al 2O 3 catalysts; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/S0920-5861(99)00334-X

We have studied the activity and selectivity of Pd/γ-Al 2O 3, VO x /γ-Al 2O 3 and Pd–VO x /γ-Al 2O 3 catalysts for the decomposition of NO and the reduction of NO with CO. Pd–VO x /γ-Al 2O 3 catalysts were prepared by anchoring Pd(AcAc) 2 on VO x /γ-Al 2O 3. Characterization of the binary samples by hydrogen chemisorption and TPR measurements indicated that the reduction of VO x is enhanced by a close contact with palladium and that partially reduced vanadia decorate noble metal particles. This palladium–vanadium interaction alters the catalytic properties of palladium: the activity for NO decomposition is higher for the binary sample and, for the NO–CO reaction, both the activity and the selectivity to N 2 increase when vanadium is in contact with palladium.