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Information × Registration Number 0223U001421, 0120U102317 , R & D reports Title Methane and Hydrogen cryoadsorption accumulators based on the principles of solid hydrate formation in hierarchically ordered composite systems popup.stage_title Head Turov Volodymyr V., Доктор хімічних наук Registration Date 28-01-2023 Organization Chuiko Institute of Surface Chemistry of NAS of Ukraine popup.description2  Adsorption of methane on the hydrated surface of hydrophobic silica AM-1, AM-1 impregnated with arginine and silica gel Si-100 was studied. It is shown that the amount of methane adsorption on the AM-1 surface depends on the hydration of the surface and sample preparation. The maximum adsorption (up to 80 mg/g) is observed for the sample hydrated after complete drying. It was established that adsorption is determined by the number of interphase water clusters of small radii. Based on the type of temperature dependence of adsorption on temperature, it was suggested that there is not only physical adsorption, but also the formation of quasi-solid methane hydrates. It was established that on the surface of the AM-1/arginine composite system, the amount of methane adsorbed under isobaric conditions increases tenfold (from 0.5 to 80 mg/g) in the presence of preadsorbed water on the surface. Probable mechanisms of methane adsorption are physical adsorption on the surface, condensation in slit-like gaps between nanosized (1-10 nm) water clusters and the surface, and formation of solid (clathrate) methane hydrates. Water adsorbed on the surface exists in the form of clusters in a wide range of hydration. It is strongly associated and has chemical shifts in the range of δН = 4-6 ppm. Hydrated structures of methane-water are quite stable and can exist even in the environment of chloroform. At the same time, part of the water goes into a weakly associated state and is observed at δН = 1.5-2 m.h. Product Description popup.authors Gunko V. M. Zrol Lina V. Krupska Tetyana V. Seduina Tetyana popup.nrat_date 2023-01-28 Close