Oriented Titanium‐MOF Membrane for Hydrogen Purification
Sixing Chen, Mohammad Wahiduzzaman, Taotao Ji, Yi Liu, Yi Liu, Yang Li, Sujing Wang, Yanwei Sun, Gaohong He, Guillaume Maurin, Sujing Wang, Yi Liu, Yi Liu
Abstract
Abstract Precise hydrogen sorting from purge gas (H 2 /N 2 ) and coke gas (H 2 /CH 4 ), commonly carried out by cryogenic distillation, still suffers from low separation efficiency, high energy consumption, and considerable capital cost. Though still in its infancy, membrane technology offers a potential to achieve more efficient hydrogen purification. In this study, an optimum separation of hydrogen towards both methane and nitrogen via a kinetically‐driven mechanism is realized through preferred orientation control of a MOF membrane. Relying on the 0.3 nm‐sized window aligned vertical to the substrate, b ‐oriented Ti‐MOF membrane exhibits ultra‐high hydrogen selectivity, surpassing the upper bound limit of separating H 2 /N 2 and H 2 /CH 4 gas pairs attained so far by inorganic membranes. This spectacular selectivity is combined with a high H 2 permeability owing to the synergistic effect of the 1 nm‐sized MOF channel.