Study of automotive storage of hydrogen using recyclable liquid chemical carriers. [Catalytic dehydrogenation of naphthenes]
The catalytic dehydrogenation of naphthenes to their corresponding aromatic compounds was evaluated as a specific non-cryogenic approach for the on-board recovery of hydrogen for use as an automotive fuel. The dehydrogenation of methylcyclohexane (MCH) to toluene was used in this study as representative of the contemplated storage system. Although not evaluated in detail, it was assumed that by-product toluene would be recycled to a central hydrogenation facility to regenerate the MCH. Thus, in principle, MCH would not be consumed, but would act as a hydrogen storage medium. It was concluded, based on literature information, thermodynamic and kinetic analyses, engineering considerations, and cost estimates that this method of hydrogen storage does not compare favorably with gasoline fueled automobiles. Approximately 16 times more volume of MCH than gasoline would be needed for the same mileage range, thus severely curtailing the range of an automobile with a reasonably sized MCH tank. In addition, an unreasonable amount of time (in excess of 20 minutes) would be needed to bring the dehydrogenation catalyst to operating temperature (589/sup 0/K) from a cold start. Other factors that make the system appear unfavorable when compared to present automobiles are excessive system weight, high cost, and general inflexibility. No detailed comparisons were made of the MCH/hydrogenstorage system with other automotive hydrogen storage systems or other automotive propulsion systems. (auth)
- Research Organization:
- Exxon Research and Engineering Co., Linden, N.J. (USA). Government Research Lab.
- OSTI ID:
- 5000657
- Report Number(s):
- TEC-75/003
- Country of Publication:
- United States
- Language:
- English
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33 ADVANCED PROPULSION SYSTEMS
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ALKANES
AUTOMOBILES
AUTOMOTIVE FUELS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
COST
CYCLOALKANES
DEHYDROGENATION
ENGINEERING
FEASIBILITY STUDIES
FUELS
GASOLINE
HYDROCARBONS
HYDROGEN FUELS
HYDROGEN STORAGE
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
STORAGE
SYNTHETIC FUELS
THERMODYNAMICS
VEHICLES