镍基非对称中空纤维膜用于乙醇自热重整制氢

采用纺丝-烧结技术制备了具有内表面致密皮层的外支撑式金属镍非对称中空纤维膜，并用于乙醇自热重整（EATR）制氢，研究了温度、进料流速、吹扫气流速、水醇比（S/C）以及氧醇比（O₂/C）等操作条件对膜制氢性能的影响。结果表明，金属镍非对称中空纤维膜既具有优异的EATR催化活性，又有良好的透氢性能。在500～1000℃、S/C=4、O₂/C=0.8的条件下乙醇可完全转化，H₂产率和H₂渗透通量可分别达到81.59%和13.99 mmol/（m²·s），增加进料中氧气含量可显著抑制膜表面积炭，但同时也会降低氢气产率和一氧化碳选择性。

Hydrogen production by ethanol autothermal reforming using nickel-based asymmetric hollow fiber membranes

Metallic nickel asymmetric hollow fiber membranes with an inner dense skin on the outer porous layer were fabricated by spinning-phase inversion technique. The membrane was used to produce hydrogen via autothermal reforming of ethanol. The operating conditions including temperature, feeding flow rate, sweeping rate, steam-to-carbon molar ratio (S/C) and oxygen-to-carbon ratio (O₂/C) were investigated and optimized. The results have shown that the asymmetric nickel hollow fibers have excellent catalytic activity to EATR and high hydrogen permeation performance as well. Operated at 500—1000℃ with a steam-to-carbon ratio of 4 and an oxygen-to-carbon molar ratio of 0.8, the ethanol was completely consumed with 81.59% hydrogen yield, and the hydrogen permeation rate reached up to 13.99 mmol/(m²·s). With the increase of oxygen concentration in feed, the carbon deposition on the membrane surface was remarkably inhibited, while the hydrogen yield and CO selectivity were decreased.