Measurement of hydrogen storage on single wall carbon nanotube (SWCNT) adsorbent and determination of model isotherm

hydrogen adsorption capacity of activated carbon and carbon nanotube was investigated with a single vessel volumetric apparatus at theree different temperature , i.e. 283,293and 303 K and at the pressure range of 0-75 bar. At all temperatures , hydrogen storage capacity was less than 0.5 wt% for both samples. by lowering adsorption temperature and increasing pressure hydrogen capacity of carbon materials increased the amount of hydrogen adsorbed on activated carbon was higher than on SWNT which could store a larger amount of hydrogen 0.3674wt% at 283 and 75 bar. the superior adsorption performance of activated carbon can be attributed to micropres available in its structure. isosteric heat of adsorption was evaluated from a set of isotherms using the thermodynamic based clausius -clapeyron equaiton which was 59 kj/mol for SWNT. the result obtained show that SWNT cannot store hydrogen for practical application at ordinary conditions.

کلیدواژه ها:

hydrogen ، SWNT ، adsorption ، storage