High Temperature Reaction of Hydrocarbon in the Presence of CO₂ on Calcium Oxide

Abstract

The reactions of hydrocarbons (n-hexane, cyclohexane and benzene) in the presence of CO₂ on calcium oxide were studied in a flow system under atmospheric pressure and mainly at 900°C.
Catalytic CO₂ reaction on calcium oxide proceeded in parallel with thermal cracking.The production of CO in the n-hexane-CO₂ reaction required reaction temperature above 850°C. It is due to the formation of calcium carbonate which is inactive for this reaction below this temperature.
The catalytic activity corresponded to the reactivity of carbon with CO₂ deposited in the absence of CO₂ rather than that of carbon deposited during the hydrocarbon-CO₂ reaction.The results suggested that the hydrocarbon-CO₂ reaction proceeded via highly reactive carbon deposited on the catalyst, as an intermediate.