Palladium-vanadium interaction in binary supported catalysts

C. NEYERTZ; M. A. VOLPE; C. GIGOLA

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Elsevier Science B.V.

Lugar: Amsterdam; Año: 2000 vol. 57 p. 255 - 260

0920-5861

We have studied the activity and selectivity of Pd/g-Al2O3, VOx/g-Al2O3 and Pd-VOx/g-Al2O3 catalysts for the decomposition of NO and the reduction of NO with CO. Pd-VOx/g-Al2O3 catalysts were prepared by anchoring Pd(AcAc)2 on VOx/g-Al2O3. Characterization of the binary samples by hydrogen chemisorption and TPR measurements indicated that the reduction of VOx 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 N2 increase when vanadium is in contact with palladium.