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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.