Hydrogen has emerged as a clean energy carrier and a pillar of the carbon-negative economy, and its production and delivery may need various purification steps, such as H2/CO2 separation in the pre-combustion carbon capture process and H2/CH4 separation in its co-delivery with natural gas. Membranes with versatile molecular size sieving abilities are of great importance to enable the economically viable and environmentally friendly use of H2. Carbon molecular sieves (CMS) membranes prepared by carbonization of polymers contain ultramicropores with strong molecular-sieving ability. In this talk, I will discuss the impact of the precursors, such as polymers, dopants, and metal-organic frameworks (MOFs), on the structure and gas separation properties. Their relationship will be elucidated, and long-term stability with simulated gas mixtures will be examined. The synergistic doping or blending and carbonization render a facile and effective way to manipulate pore sizes to achieve desirable molecular sieving ability.

Energy-efficient molecular sieving membranes to enable hydrogen economy

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