Hydrogen adsorption/desorption studies were performed for the samples microwave treated and activated carbon sample in the pressure ranges 0–4 MPa and at 303 K using a high-pressure Automated Sievert’s apparatus from Advanced Material Corporation, USA. The leakage test of the instrument has been carried out with high pure hydrogen (99.999%) at high pressure before starting the experiment. Initially all samples were evacuated at 10−3 mbar for 6 h at 423 K