GRANULAR AND PELLETIZED ACTIVATED CARBON BASED ON OLIVE STONES FOR METHANE STORAGE | Journal of ...

At ambient temperature (298 K) and a low pressure of around 10 bars, the behaviour of an activated carbon based on olive stones as an adsorbent for pure methane was examined. Chemical activation with phosphoric acid yielded two types of activated carbons (granular and pelletized). Methane storage was accomplished through the use of two distinct measurement methodologies (gravimetric and volumetric). A cyclic operation of 5 charge-discharge cycles was performed for volumetric measurements utilising the two kinds of adsorbent granular activated carbon CAGOC and pelletized one CAGOC-Pas. CAGOC storage reaches 40 mg/g at 10 bars, with a release of around 30 mg/g at atmospheric pressure. CAGOC-Pas without binder, on the other hand, achieves a huge amount of adsorbed methane of about 68 mg/g under 10 bars with a discharge of around 50 mg/g at atmospheric pressure. Under 50 pressures, there was a significant increase in adsorbed quantity from granular to pelletized activated carbon, from 72 mg/g to 105 mg/g. The differences in adsorption capabilities and cyclic behaviour are most likely due to the best textural qualities and surface morphologies of CAGOC-Pas. Temperature-dependent methane isotherms demonstrate that the isosteric heat of adsorption approaches 20 kJ/mol for all loading methane stages.

Please see the link :- https://www.ikprress.org/index.php/JACSI/article/view/2955