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Adsorbed natural gas
Natural gas burns cleanly as a fuel, making it useful in many vehicles. It contains mostly methane and ethane. These light gases have very high vapor pressure at ambient temperatures, and their storage requires either high-pressure compression or an extreme reduction of temperature.
Recently, a process has been introduced to store natural gas called adsorbed natural gas, or ANG. In this process, natural gas adsorbs to a porous sorbent at relatively low pressure (500 to 600 psi) and ambient temperature, solving both the high-pressure and low-temperature problems. If a suitable sorbent is used, it is possible to store more gas in a sorbent-filled vessel than in an empty vessel at the same pressure. The amount of adsorbed gas depends on pressure, temperature and sorbent type. Since this adsorption process is exothermic, an increase of pressure or a decrease of temperature enhances the efficiency of the process. Changing the sorbent also affects efficiency. Activated carbon is a sorbent with high surface area that can be used in ANG storage tanks. Currently, researchers are developing new sorbents with higher adsorption ratio to optimize this process.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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