Water-selective zeolite membranes The yield of many gas-phase industrial reactions is limited by the formation of water as a by-product. Li et al. harnessed the water-sieving properties of NaA zeolite crystals by forming them into continuous defect-free membranes within tube reactors (see the Perspective by Carreon). These membranes can let water pass but reject gases such as hydrogen, carbon monoxide, and carbon dioxide (CO2). When these membranes were used in CO2 hydrogenation to form methanol with water as a by-product, substantial increases were observed in both the CO2 conversion and methanol yield. Science, this issue p. 667; see also p. 624 Water-selective membranes made from NaA zeolite crystals impede other gas molecules and boost CO2 hydrogenation to methanol. Robust, gas-impeding water-conduction nanochannels that can sieve water from small gas molecules such as hydrogen (H2), particularly at high temperature and pressure, are desirable for boosting many important reactions severely restricted by water (the major by-product) both thermodynamically and kinetically. Identifying and constructing such nanochannels into large-area separation membranes without introducing extra defects is challenging. We found that sodium ion (Na+)–gated water-conduction nanochannels could be created by assembling NaA zeolite crystals into a continuous, defect-free separation membrane through a rationally designed method. Highly efficient in situ water removal through water-conduction nanochannels led to a substantial increase in carbon dioxide (CO2) conversion and methanol yield in CO2 hydrogenation for methanol production.

中文翻译：

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用于促进二氧化碳转化为液体燃料的 Na+ 门控水传导纳米通道

水选择性沸石膜 许多气相工业反应的产率受到水作为副产物的形成的限制。李等人。通过在管式反应器内将 NaA 沸石晶体形成连续的无缺陷膜，利用了 NaA 沸石晶体的水筛分特性（参见 Carreon 的观点）。这些膜可以让水通过，但会排斥氢气、一氧化碳和二氧化碳 (CO2) 等气体。当这些膜用于 CO2 加氢以形成副产物为水的甲醇时，观察到 CO2 转化率和甲醇产率均显着增加。科学，这个问题 p。667; 另见第 624 由 NaA 沸石晶体制成的水选择性膜会阻碍其他气体分子并促进 CO2 氢化成甲醇。强壮的，气体阻隔水传导纳米通道可以从氢气 (H2) 等小气体分子中筛出水，特别是在高温和高压下，对于促进许多受水（主要副产品）严重限制的重要反应在热力学和动力学上。在不引入额外缺陷的情况下识别此类纳米通道并将其构建到大面积分离膜中具有挑战性。我们发现通过合理设计的方法将 NaA 沸石晶体组装成连续的、无缺陷的分离膜，可以产生钠离子 (Na+) 门控水传导纳米通道。通过水传导纳米通道高效原位除水导致二氧化碳 (CO2) 转化率和用于甲醇生产的 CO2 加氢过程中的甲醇产率显着增加。