Abstract The metallic nickel hollow fiber membranes (NHFMs) consisting of a dense skin layer integrated on porous nickel substrate were fabricated in a single extrusion step by using a 90 wt% NMP-H2O solution and water as the respective internal and external coagulants during the spinning process. The resultant asymmetric Ni hollow fibers by sintering were directly applied to hydrogen production from methane steam reforming (MSR), where the porous internal surface functioned as a catalyst bed for MSR reactions, and the external dense skin layer served as the membrane for hydrogen extraction from the reaction products. The effects of the feed composition in terms of steam-to-methane ratio (H2O/CH4) and methane concentration; the operational parameters including temperature, space velocity, and the sweep gas flow rate on the performance of the hollow fibers were investigated. The results reveal that the reaction operational temperature should be above 800 °C and the H2O/CH4 ratio controlled around 3 so as to achieve both high methane conversion and high H2 production rate. When operated at 1000 °C and 25,937 h−1 methane space velocity, the maximum H2 production rate reached 50.84 mmol m−2 s−1 while the methane conversion reached at 98.58%. In order to produce pure hydrogen, steam may be used as the sweep fluid instead of inert gases such as nitrogen to prevent the dilution of the permeated gaseous hydrogen. The prepared asymmetric NHFMs also demonstrate high chemical stability in the reformate gases and high resistance to carbon deposition at above 800 °C, and thus may be a promising way of cost-effective hydrogen production by MSR at high temperatures.

中文翻译：

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使用金属镍中空纤维膜通过甲烷蒸汽重整制氢

摘要 在纺丝过程中，使用 90 wt% NMP-H2O 溶液和水作为各自的内部和外部凝结剂，在单个挤压步骤中制造了由集成在多孔镍基材上的致密表层组成的金属镍中空纤维膜 (NHFM)。过程。通过烧结得到的不对称 Ni 中空纤维直接应用于甲烷蒸汽重整 (MSR) 制氢，其中多孔内表面充当 MSR 反应的催化剂床，外部致密表层充当从甲烷蒸汽重整 (MSR) 中提取氢的膜。反应产物。进料成分对蒸汽与甲烷比（H2O/CH4）和甲烷浓度的影响；操作参数包括温度、空间速度、并研究了吹扫气体流速对中空纤维性能的影响。结果表明，反应操作温度应在 800 °C 以上，H2O/CH4 比控制在 3 左右，以实现高甲烷转化率和高 H2 产率。当在 1000 °C 和 25,937 h-1 甲烷空速下运行时，最大 H2 产率达到 50.84 mmol m-2 s-1，而甲烷转化率达到 98.58%。为了生产纯氢气，可以使用蒸汽代替惰性气体如氮气作为吹扫流体，以防止渗透的气态氢气被稀释。制备的不对称 NHFM 在重整气中也表现出高化学稳定性和在 800°C 以上的高抗积碳能力，