Affiliation:
1. National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China
2. University of Chinese Academy of Sciences Beijing 100049 China
Abstract
AbstractTranslating carbon molecular sieve (CMS) membranes into highly scalable hollow fiber geometry with ultra‐thin selective layer (<1 µm) for gas separation remains as great challenge. The porous support layer of precursor hollow fiber membranes is prone to collapse during pyrolysis, which induces thick skin layer (15–50 µm) of CMS hollow fiber membranes. Here, a novel strategy is present to obtain an ultra‐thin selective skin layer by carbonization of hollow fiber membranes with porous skin. P84‐based defect‐free CMS hollow fiber membranes with ultra‐thin selective skin layer (0.9 µm) for gas separation are prepared without any coating or complex chemical pretreatment. Compared with the carbon membranes derived from defect‐free fibers, the H2 permeance (93.9 GPU) of CMS membranes derived from the porous fibers increases ≈1353% with comparable selectivity of H2/CH4 (143) and higher H2/N2 (120). Furthermore, the porous fibers are pre‐aged near the Tg in N2 conditions before carbonization, and the H2 permeance of the derived CMS hollow fiber membranes reached 147 GPU (increased 2180%). It is a new facile way to prepare CMS hollow fiber membranes with ultra‐thin selective layer by porous fibers, demonstrating its versatile potential in gas separation or organic liquids separation.