Investigation of polymeric adsorbents in hydrogen adsorption

Highly demand for fossil fuels on one hand, and environmental negative impacts of such fuels on the other hand, makes attractive and economic finding a new source ofenergy. Hydrogen with high heating value and production of no air pollutant and no greenhouse gases is suggested as analternative fuel. The main issue in using hydrogen as fuel is the storage of the gas. A capacity of 45 g H2 per L of storage system was the US Department of Energy 2010 target. Thereare several methods to store and use hydrogen, such as cryogenic and/or compressed gas, physisorption on polymericor organometallic materials. However, liquefaction of hydrogen needs very low temperature, compressing of the gasneeds special tanks and high pressure. To store hydrogen in anadsorption process various porous materials such as activated carbon, zeolite, metal organic frame works and polymers areused. Metal hydrides as sorbent are effective frame work for the storage, but having high weight and requiring too muchenergy to be consumed to release the adsorbed hydrogen limits their use. In this study, therefore, we demonstrate comparison betweendifferent adsorbents capability, namely activated carbon, metal organic frame work, zeolite and polymeric adsorbent, in hydrogen storage as a function of pressure