This feasibility study of hydrogen as a fuel for future vehicle propulsion considers fuel availability, economics and the storage system. The compatibility of a hydrogen-air engine with possible future requirements is assessed. The rate of formation of nitric oxide, based on the rate kinetics in a hydrogen-air mixture, indicates a higher nitric-oxide concentration in the exhaust gas of a hydrogen engine than in the exhaust gas of an equivalent petrol engine. Methods of reducing the emission levels and the design changes are discussed.
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