Utilization of hydrogen produced from urea on board to improve performance of vehicles

Publication year: 2011
Source: International Journal of Hydrogen Energy, In Press, Corrected Proof, Available online 14 June 2011

C., Zamfirescu , I., Dincer

In this paper, we analyze the feasibility of using urea for onboard hydrogen production to improve the efficiency of vehicles. Here, hydrogen is used as an additive to the primary fuel (gasoline, diesel). Urea is generally obtained in large quantities by combining ammonia with carbon dioxide in industry. The reverse reaction of decomposing urea into ammonia and carbon dioxide is widely known and currently used for production of ammonia in diesel vehicles where it serves as a NOx reduction agent. In the present system, the vehicle is equipped with a tubular urea tank as placed in the vicinity of the…

 Highlights: ► Urea as source of hydrogen to enrich diesel and gasoline fuels. ► Heat rejected by the engine is recovered to generate hydrogen from urea. ► Fuel economy and overall power generation efficiency enhanced. ► Reduce driving cost with 45% and GHG emissions with 60%. ► The relative costs of urea, gasoline and diesel influence the system economics.