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Information × Registration Number 0220U000175, 0117U000022 , R & D reports Title Working out fundamental base for process of nanoporous adsorbents preparation from alkali activated coals of different rank popup.stage_title Head Kucherenko Volodymyr, Registration Date 21-01-2020 Organization LM.Litvinenko Institute of Physical Organic and Coal Chemistry popup.description2 Methods of X-ray diffraction, IR spectroscopy and low-temperature nitrogen adsorption have established regularities of structural changes in the transformation of different rank coals into activated carbon (AC) at temperatures up to 800°C under conditions of thermoprogrammed alkaline activation. The main changes in the molecular structure are resulted in the heterolysis of C-O and C-C bonds, the formation of volatile products and potassium humates - the precursors of the secondary porous framework. The supramolecular structure changes at 400-650°C due to the disordering of the polyrenes and their "crosslinking" of the Car-Car bonds into the polyarylene framework. The coal rank growth was found to increase the AC yield from 49.9% to 82.8% and to decrease the specific surface area from 1580 m2/g to 320 m2/g and to change pore size distributions. Increasing temperature promotes the subnanopores formation being limited by the KOH diffusion, and their subsequent transformations form the AC final nanoporous structure. Product Description popup.authors Єфімова Ірина Владиславівна Абакумов Олександр Олександрович Волкова Лариса Костянтинівна Кравченко Віктор Васильович Кравченко Галина Григорівна Сабєрова Вікторія Олександрівна Смоляр Олена Федорівна Тамаркіна Юлія Володимирівна Фролова Ірина Борисівна Чернишова Марина Іванівна Шендрік Тетяна Георгіївна popup.nrat_date 2020-04-02 Close