Accession Number : AD0670164

Title :   A STUDY OF METHYLCYCLOHEXANE DEHYDROGENATION OVER A PLATINUM-ON-ALUMINA CATALYST AT 602F.

Descriptive Note : Technical rept. Aug 66-Dec 67,

Corporate Author : AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Zengel,Alan E.

Report Date : APR 1968

Pagination or Media Count : 63

Abstract : A laboratory reactor was set up and operated as a differential catalytic reactor for a study of the dehydrogenation of methylcyclohexane over an 0.8 weight percent platinum on alumina catalyst. The reactor was operated as a differential reactor; i.e., with only small conversions, in order to reduce the effect of the large endothermic heat of reaction associated with the dehydrogenation of methylcyclohexane. The main tasks were to set up and successfully operate a reactor that could be used in laboratory kinetics studies. It was also necessary to determine the conditions for a study of the chemical reaction rate of methylcyclohexane dehydrogenation that was unencumbered by physical rate-limiting processes. Reactions were run at 76 psia and 602F. The effect of diffusion within the catalyst particle was minimized by using particles that were crushed and screened through a 50 mesh Tyler screen and retained on a 70 mesh Tyler screen. The surface reaction was found to be first order with respect to methylcyclohexane partial pressure under the conditions studied. Although the data are too limited to determine the rate limiting step, a discussion of the rate data along with results reported in the literature for similar rate studies suggests that the conversion of methylcyclohexane to toluene and hydrogen is limited by a single site-surface reaction. (Author)

Descriptors :   (*JET ENGINE FUELS, HEAT SINKS), (*CYCLOHEXANES, DEHYDROGENATION), (*TOLUENES, SYNTHESIS(CHEMISTRY)), CATALYSIS, CATALYSTS, PLATINUM, REACTION KINETICS, THERMOCHEMISTRY, MASS TRANSFER, CHEMICAL EQUILIBRIUM, AERODYNAMIC HEATING

Subject Categories : Industrial Chemistry and Chemical Processing
      Physical Chemistry
      Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE