Abstract:
Adsorption isotherms data of methane and carbon dioxide gases on the activated carbons were measured
experimentally using a volumetric method with pressure and temperatures ranging from 0 to 3.5 MPa and
27 to 65°C, respectively. Two types of activated carbons, namely, (1) Kalimantan Timur type activated carbon,
which is lab-produced from Indonesian low-grade coal and (2) a commercial (Carbotech) activated carbon
were used. The adsorption isotherms obtained were found to belong to type 1 of the International Union
of Pure and Applied Chemistry classification. The adsorption uptakes for both carbon dioxide and methane
on commercial activated carbon are higher than for the Kalimantan Timur activated carbon. This is due to
higher Brunauer–Emmet–Teller surface area and pore volume of the former. Langmuir and Tóth isotherm
models are correlated to predict the experimental data with acceptable accuracy.
