Collect. Czech. Chem. Commun. 1985, 50, 1259-1267

Adsorption of nitrogen oxide on a V2O5/Al2O3 catalyst

Zdeněk Sobalíka, Vladimír Poura, Ludmila A. Sokolovab, Olga V. Nevskayab and Nina M. Popovab

a Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6, Czechoslovakia
b Institute of Organic Catalysis and Electrochemistry, Academy of Sciences of the Kazakh. SSR, Alma Ata, U.S.S.R.


The adsorption and desorption of nitrogen oxide on oxidized and reduced V2O5/Al2O3 catalysts (14.7% (m/m) V2O5) were studied by gravimetry, infrared spectroscopy, and temperature programmed desorption measurements. On the reduced catalyst, NO is adsorbed giving rise to mono- and dinitrosyls which exhibit infrared bands at 1 690, 1 760, 1 820, and 1 895 cm-1. A band also appears at 1 220 cm-1 corresponding to nitrite structures. The ratio between the nitrosyl and nitrite structures is approximately 4 : 1. Desorption at elevated temperatures is associated with the evolution of NO and N2O in a volume ratio of 10 : 1. On the oxidized catalyst the adsorption occurs to an extent at least two order of magnitude lower and no nitrosyls are formed.