Production of Cyclohexene and Reactive Sulfur Species in Vapor-Phase Catalytic Oxidative Dehydrogenation of Cyclohexane with Carbonyl Sulfide

Article abstract of DOI:10.1246/bcsj.59.2577

The vapor-phase catalytic oxidative dehydrogenation of cyclohexane with COS over SiO2 and Al2O3 catalysts (e.g., C6H12+COS->C6H10+CO+H2S) has been investigated with respect to the production of cyclohexene and cyclohexadiene as well as the mechanism of the dehydrogenation reaction.The representative value of the combined yield of cyclohexene+cyclohexadiene is 8.0percent and the combined selectivity to these two products at this yield obtained is 34.0percent.These values are comparable to the values 8.0 and 30.8percent reported in a recent Japanese patent.The comparison of the catalytic performance between two types of flow fixed-bed reactors demonstrates that the role of solid catalysts is to decompose COS into CO and sulfur which then dehydrogenates hydrocarbons through a homogeneous mechanism.The results of the kinetic analysis of these reactions, together with the stimulation of the overall catalytic reaction system, suggest a contribution of atomic sulfur to the oxidative dehydrogenation of cyclohexane in a conventional flow fixed-bed reactor.