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Author: search.filters.author.Khalameida, SvitlanaSubject: search.filters.subject.porous structure

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    Synthesis, porous structure and catalytic properties of mixed vanadium-titanium phosphates in aldol condensation reaction of acetic acid with formaldehyde
    (Lviv Polytechnic Publishing House, 2016) Nebesnyi, Roman; Shpyrka, Iryna; Sydorchuk, Volodymyr; Khalameida, Svitlana; Khalameida, Svitlana; Ivasiv, Volodymyr; Orobchuk, Oksana; Zavalii, Kateryna; Lapychak, Nazariy; Lviv Polytechnic National University; Institute for Sorption and Problems of Endoecology of NAS of Ukraine
    Mixed vanadium-titanium phosphates as well as individual vanadium and titanium phosphates were prepared via precipitation from sulfate aqueous solutions. Co-precipitated phosphates were modified through mechanochemical treatment (MChT) and characterized using the adsorption-structural methods. The aldol condensation of acetic acid with formaldehyde to acrylic acid has been used as a test reaction. Reduction of optimum reaction temperature from 623 K to 573 K on the treated catalysts is observed.
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    Catalysts of aldol condensation of acetic acid with formaldehyde
    (Видавництво Львівської політехніки, 2017-12-23) Shpyrka, Iryna; Nebesnyi, Roman; Sydorchuk, Volodymyr; Khalameida, Svitlana; Ivasiv, Volodymyr; Zavalii, Kateryna; Lviv Polytechnic National University; Institute for Sorption and Problems of Endoecology of NAS of Ukraine
    It had been demonstrated that mechanochemical and hydrothermal treatment of support allows increasing activity and selectivity of the catalyst in the studied process. Hydrothermal treatment (HTT) of silica increases mechanical strength of silica gel granules subjected to hydrothermal treatment, also reduction of coke formation takes place, as well as prolongation of the catalysts life. Similarly, the same approaches allow to optimize the pore structure of titanium phosphates.