Industrial membranes for hydrogen separation
Production of hydrogen, as an environmentally benign alternative for fossil fuels that mainly contribute to the growing pollutant emissions, has been considered specifically in the last decades. As a result of being associated with other gases, such as CO2, CO and other impurities, the produced hydrogen must be separated and purified before being utilized by various processes. For this purpose, adsorption-based and cryogenic processes are the most conventional methods which encounter some restrictions, related to the required energy and time that make these processes not economically lucrative in some circumstances. As a result, recently, the membrane technology as well as membrane reactors has emerged to deal with these limitations. Among the common types of membranes including organic and inorganic membranes and their subgroups, which offer high selectivity and permeability to hydrogen, the stable, energy-efficient and cost-effective ceramic membranes, which are unaffected by the existing poisonous gases in the gas mixtures, are the most promising candidates for hydrogen separation in an effective manner in near future.