In light of tighter restrictions on vehicle emissions and the existence of abundant resources, natural gas represents a highly attractive transportation fuel. Worldwide, there are currently more than 976,000 natural gas-vehicles, most of which are located in Europe and South America.1 At present, Compressed Natural Gas (CNG) is the technology most widely used, which stores gaseous fuel at very high pressures (about 3,000 psig). However, short driving ranges and questions of safety and cost have limited the penetration of Natural Gas Vehicles (NGV) into the transportation market in the U. S. This is in spite of the relatively lower price of natural gas compared with other fuels on an energy basis. A new technology called Adsorbed Natural Gas (ANG) is being developed, which contains the gaseous fuel in a dense form at a moderate pressure (500 psig). The lower pressure utilized by ANG allows the usage of conformable tanks which overcomes the short driving range of CNG. Nonetheless, the hope for ANG vehicles depends on further development in the areas of heat management and gas conditioning, in order to preserve the gas tank capacity.

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