Vaporizing and Endothermic Fuels for Advanced Engine Application. Part III. Studies of Thermal and Catalytic Reactions, Thermal Stabilities, and Combustion Properties of Hydrocarbon Fuels
Technical rept. Jun 1968-Sep 1969
SHELL DEVELOPMENT CO EMERYVILLE CA
Pagination or Media Count:
The investigation of the feasibility of utilizing the endothermic and enthalpic capacity of hydrocarbons to fuel and cool high speed aircraft is continued. Calculation of the cooling requirement for a Mach 8 supersonic combustion ramjet engine under standard conditions indicate that this would be about 1900 Btu per pound of fuel. The possibility of utilizing the dehydrogenation of bridged-ring naphthenes for providing additional heat sink has been studied but no suitable catalysts have been found for this reaction. Studies on methods accelerating the thermal cracking of paraffins by means of additives has shown some promise. In the dehydrogenation of naphthenes over supported platinum catalysts the stability of the catalyst was found to be inversely proportional to the pore size of the support, and is also affected by the composition of the support. Efforts to induce the dehydrogenation of methylcyclohexane using dispersed catalysts has met with some success. Also quite marked variations in the rate and type of reaction have been observed depending on the type and source of the metal used for the reactor tube. A large number of additional granular catalysts have been tested for their activity in dehydrogenation of MCH.
- Agronomy, Horticulture and Aquiculture