Na ⁺ -gated water-conducting nanochannels for boosting CO ₂ conversion to liquid fuels

Abstract

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.

Novel Heterogeneous Catalysts for CO2 Hydrogenation to Liquid Fuels

“…For example, a membrane reactor can shift the equilibrium-limited CO 2 hydrogenation to liquid fuels by selective and continuous in situ removal of the byproduct water, leading to a substantial increase in CO 2 conversion as well as the yield of liquid fuels. 137 − 139 …”

Recent Development in Composite Membranes for Flow Batteries

“…This strategy requires ac ertain amounto fp recursor and properi nteractions between the substrate and precursor.F or instance, az eolitic imidazolate framework (ZIF)-based layer (that is, ZIF-8) could be grown on polyacrylonitrile (PAN) fibers, which were treated with the organic linker 2-methylimidazole in advance. [34b] Li et al [72] proposed the use of high-density zeolite crystal seeds bonded to the support layer via dehydration, obtaining robust and dense nuclei for further second growth. Some self-assembled-monolayer-modified substrates can direct nucleation and oriented growth for both MOFs and zeolites as well.…”

“…For instance, a zeolitic imidazolate framework (ZIF)‐based layer (that is, ZIF‐8) could be grown on polyacrylonitrile (PAN) fibers, which were treated with the organic linker 2‐methylimidazole in advance . Li et al . proposed the use of high‐density zeolite crystal seeds bonded to the support layer via dehydration, obtaining robust and dense nuclei for further second growth.…”

Applications of Zeolites to C1 Chemistry: Recent Advances, Challenges, and Opportunities

“…The difficulty of this challenge is attributed A-E) Reproduced with permission. [77] Copyright 2020, The American Association for the Advancement of Science.…”

“…In situ water removal by the water‐conduction membrane (WCM) afforded high CO 2 conversion and efficient production of methanol from CO 2 . [ 77 ] The hydrophilic zeolite A enabled the facile adsorption of generated water. After the CO 2 , H 2 , water, and methanol molecules entered the zeolite channels, compensating Na + ions facilitated the passage of small, polar water molecules but hindered the passage of molecules that were less polar or larger, such as H 2 and CO 2 , through the zeolitic microchannels (Figure 9B).…”