Miyamoto Manabu, Ono Shumpei, Kusukami Kodai, Oumi Yasunori, Uemiya Shigeyuki
Department of Chemistry and Biomolecular Science, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
Department of Materials Science and Technology, Gifu University, 1-1 Yanagido, Gifu, 501-1193, Japan.
ChemSusChem. 2018 Jun 11;11(11):1756-1760. doi: 10.1002/cssc.201800063. Epub 2018 May 18.
Dehumidification in CO adsorptive separation processes is an important issue, owing to its high energy consumption. However, available adsorbents such as low-silica zeolites show a significant decrease in CO adsorption capacity when water vapor is present. A core-shell-structured MFI-type zeolite with a hydrophilic ZSM-5 coated with a hydrophobic silicalite-1 shell layer was applied in CO adsorptive separation under wet conditions. This hybrid material demonstrated remarkably high water tolerance with stable CO adsorption performance without additional thermal treatment for regeneration, whereas a significant decrease in the CO adsorption amount because of water vapor was observed on the parent ZSM-5. The core-shell structure of zeolites with high pore volumes, such as LTA or CHA, could also be suitable candidates for high CO adsorption capacity and high water tolerance for practical applications.
在CO吸附分离过程中，除湿是一个重要问题，因为其能耗较高。然而，现有的吸附剂，如低硅沸石，在有水蒸气存在时，CO吸附容量会显著降低。一种核壳结构的MFI型沸石，其亲水的ZSM-5被疏水的硅沸石-1壳层包覆，被应用于潮湿条件下的CO吸附分离。这种混合材料表现出显著的高耐水性，具有稳定的CO吸附性能，无需额外的热处理进行再生，而在母体ZSM-5上观察到由于水蒸气导致的CO吸附量显著下降。具有高孔体积的沸石核壳结构，如LTA或CHA，也可能是适用于实际应用的高CO吸附容量和高耐水性的候选材料。
