Accession Number : AD0802108

Title :   VAPORIZING AND ENDOTHERMIC FUELS FOR ADVANCED ENGINE APPLICATION. PART III. FURTHER STUDIES OF THERMAL AND CATALYTIC REACTIONS, THERMAL STABILITIES AND COMBUSTION PROPERTIES OF HYDROCARBON FUELS.

Descriptive Note : Technical documentary rept. Jun 65-Jun 66,

Corporate Author : SHELL DEVELOPMENT CO EMERYVILLE CALIF

Personal Author(s) : Nixon,A. C. ; Ackerman,G. H. ; Hawthorn,R. D. ; Henderson,H. T. ; Ritchie,A. W.

Report Date : SEP 1966

Pagination or Media Count : 327

Abstract : Investigation of the feasibility of utilizing hydrocarbons as heat-sink fuels for hypersonic aircraft has continued. Both thermal and catalytic endothermic reactions have been considered, at temperatures up to 1400 F, pressures to 1000 psi, liquid hourly space velocities up to 260 and 150, respectively. Mono- and dicyclic naphthenes appear to be the most promising feeds to date. Utilizing dehydrogenation to the corresponding aromatics over a platinum on alumina catalyst, reaction heat sinks of about 1000 Btu/lb of feed should be achievable with the lower members of the series, such as cyclohexane, methylcyclohexane, dicyclohexyl, and decalin. Laboratory studies have been made on the dehydrogenation of a wide variety of naphthenes over Pt/Al2O3 catalysts to determine approximate reaction kinetics and selectivities. Rates of reaction generally increase with alkyl substitution. Activation energies show variable behavior. Selectivities for the corresponding aromatics are high. Some problems with catalyst life and consecutive reactions have been encountered; some solutions have been found.

Descriptors :   (*CYCLOHEXANES, HEAT SINKS), (*LIQUID ROCKET FUELS, CATALYSIS), (*DEHYDROGENATION, MONOCYCLIC COMPOUNDS), HIGH TEMPERATURE, REACTION KINETICS, SUBSTITUTION REACTIONS, THERMAL STABILITY, MOLECULAR WEIGHT, HEAT EXCHANGERS, HEAT TRANSFER COEFFICIENTS, HIGH PRESSURE, SHOCK TUBES, IGNITION LAG, MOLECULAR STRUCTURE, HYPERSONIC FLIGHT, COMBUSTION, OXYGEN, ARGON, PROPANE

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE