Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Institute of Industrial Catalysis, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310032, P.R. China.
Science. 2020 Feb 7;367(6478):667-671. doi: 10.1126/science.aaz6053.
Robust, gas-impeding water-conduction nanochannels that can sieve water from small gas molecules such as hydrogen (H), 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 (CO) conversion and methanol yield in CO hydrogenation for methanol production.
具有稳健、阻碍气体传输、能够对水进行筛分的纳米通道，使其能够将水与诸如氢气（H）等小分子气体分离，这种纳米通道在高温高压下尤为理想，因为它可以促进许多重要的反应，而这些反应受到水（主要副产物）的热力学和动力学的严重限制。识别并构建这种纳米通道成为大面积分离膜而不引入额外缺陷是具有挑战性的。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，可以形成钠离子（Na）门控水导纳米通道。通过水导纳米通道高效的原位除水，使得二氧化碳（CO）加氢制甲醇反应中 CO 的转化率和甲醇产率有了显著提高。
