State-of-art designs and synthesis of zeolite membranes for CO2 capture
Xingyuan Gao, Zhigang Wang, Tianjia Chen, Lifen Hu, Shiting Yang, Sibudjing Kawi
Abstract
Effective capture of CO2 benefits the environmental protection and energy utilization. Zeolite membranes are featured with their ordered pore structures, CO2 affinity and chemical stability. This comprehensive review is mainly focused on the state-of-art designs and synthesis of zeolite membranes for CO2 capture, including the transport mechanisms (Knudsen, surface and gas translation diffusion), structural and surface properties (orientations, defects, thickness, hydrophobicity), synthesis methods (organic structure-directing agent (OSDA)-assisted processes, mild removal of template, gel/OSDA-free approaches), synthesis conditions (temperatures, synthesis time, pH values, seeding, chemical ratios), operation parameters (temperatures, pressures, flow rates, feed compositions, humidity, impurities) and modification strategies (composite zeolite structures, inorganic additives, supports). The synthesis‒structure‒operation‒performance relationships are discussed critically and in depth. Finally, conclusive remarks and future predictions are also provided.