DEVELOPMENT IN HIGH-PERFORMANCE MEMBRANES FOR EFFICIENT HYDROGEN PURIFICATION

摘要

Hydrogen has been extensively accepted as a clean energyrnsource to resolve the current energy shortage and environmentalrncrisis. Byproduct like CO_2 has to be removed to achieve high purityrnhydrogen for further usage in the produced process of hydrogen.rnMembrane-based gas separation technology for efficient hydrogenrnpurification has attracted considerable attention owing to the inherentrnadvantages over other conventional separation techniques. H_2-rnselective membrane (Fig. 1 a) and CO_2-selective membrane (Fig. 1 b)rnare two types to separate H_2-CO_2 system. Our group found that CO_2-rnselective membranes are more appropriate for high purityrnH2 acquisition and that H_2-selective membranes are morernadvantageous in terms of economic cost and H_2 recovery over arnrelatively low purity range.1 Currently, great efforts have beenrndevoted to CO_2-selective membrane which could avoid hydrogenrnrecompression and fit for high purity H_2 acquisition. However, mostrnmembranes have not been commercialized and applied in practicalrnprocesses due to the lack of materials possessing high separationrnperformance and stability which could meet the purity, recovery andrncost requirements of hydrogen supply. Therefore, it is necessary torndevelop advanced membrane materials and high-performancernmembranes to meet increasing demands for efficient hydrogenrnpurification.