Upgrading methane purity in biogas plant gamping by using carbon-based molecular sieve

Biogas is considered as a promising renewable energy. Therefore, in order to achieve a high quality of energy, biogas upgrading steps at the upstream of its final utilization is required. One of the most important steps is CO2 removal which has a significant impact on improving the biogas properties for energy applications. In this study, separation of CO2 from biogas (consisting of CO2/CH4: 63/37 vol) in a packed-bed of Palm Kernel Shell (PKS)-based porous carbon was performed. The separation-regeneration cycle was carried out at atmospheric pressure, isothermal conditions (30 °C), and different feed flow rates (25, 50, and 100 mL.min-1 ). The study showed that CO2 was successfully separated from biogas which produced CH4 with high purity (>98 vol). On the other hand, the separation behavior of gases on porous carbon was influenced by feed flowrate where the high separation capacity was achieved at low feed flowrate. © 2021 Trans Tech Publications Ltd, Switzerland.