Abstract
Results are presented for the pyrolysis of individual hydrocarbons (hexane and cyclohexane), a mixture of n-paraffins boiling in the 100 to 300/sup 0/ range, and straight-run gasoline fractions with indium oxide as a catalyst. It was found that optimum dilution of the petroleum fraction with steam occurred at a molar ratio of 1:1. The presence of the indium catalyst was found to increase the yield of low molecular weight olefins under the selected experimental conditions by about 20% when compared with the pyrolysis without an active component catalyst. Kinetic studies of the catalytic reaction indicated that under conditions of pyrolysis, indium oxide takes part in a redox type reaction; also, oxidation which requires the higher temperature is the limiting stage of redox conversions. X-ray studies confirmed the possibility of redox transformation of indium oxide under pyrolytic conditions and the consequent variations in catalytic behavior. Further, an isotope tracer method was used to study the reaction mechanism in the interaction of RH type hydrocarbons and water. (BLM)
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