Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 3043 - 3058 (1988)
Update date:2022-08-11
Topics:
Al-Haidary, Yousif Kadim
Saleh, Jalal Mohammed
The interaction of dimethyl sulphide (Me2S) and dimethyl disulphide (Me2S2) has been studied with metal films of Fe, Pd, Ni, Al and Cu over the temperature ranges 193-500 K with Me2S and 223-600 K in the case of Me2S2.At 193 K mainly molecular chemisorption of Me2S occured on the films.With Me2S2, multilayer adsorption, involving both chemisorption and van der Waals adsorption took place on the films at 223 K.Dissociative chemisorption of Me2S or Me2S2 began above 300 K and was accompained by the evolution of gaesous products.The latter involved H2, CH4 and C2H6 gases with Me2S and H2, CH4, C2H6, MeSH and Me2S subsequent to the dissociation of Me2S2.Additional gaseous products throughout the decomposition on the oxidized films were CO, H2O and C2H4.The rate of Me2S or Me2S2 chemisorption depended on the pressure of the reacting gas, and the kinetic data indicated the operation of a compensation effect throughout the interaction of Me2S or Me2S2 with the films.On the basis of kinetic data it was possible to arrange the metal films in the order of decreasing activity toward Me2S or Me2S2 adsorption.The transition-metal films showed greater activity than Al and Cu, and among the former films Fe showed the greatest activity, for chemisorption of Me2S and Me2S2.All the metals have higher tendencies for Me2S adsorption than for Me2S2.
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