Adsorption of nitrogen oxide on a V2O5/Al2O3 catalyst

Sobalík, Zdeněk; Pour, Vladimír; Sokolova, Ludmila A.; Nevskaya, Olga V.; Popova, Nina M.

doi:10.1135/cccc19851259

CCCC > Archive > 1985, Volume 50 > Issue 6 > p. 1259

Adsorption of nitrogen oxide on a V₂O₅/Al₂O₃ catalyst

Zdeněk Sobalík^a, Vladimír Pour^a, Ludmila A. Sokolova^b, Olga V. Nevskaya^b and Nina M. Popova^b

^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.

Abstract

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.

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