Effects of Gamma-Activation and  Functionality Characteristics of Superdispersed  ZrO2 –Catalystes in Methanol Conversion

Ivan Fedorets V.N. Karazin Kharkiv National University, Kharkiv, Ukraine https://orcid.org/0000-0001-7221-3134
Nina Khlapova V.N. Karazin Kharkiv National University, Kharkiv, Ukraine https://orcid.org/0000-0002-2591-4904
Mykola Dikiy National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine https://orcid.org/0000-0002-1289-625X
Elena Medvedeva National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine https://orcid.org/0000-0001-9024-6327
Dmitrij Medvedev National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
Vyacheslav Uvarov National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine
D. Bakay National Science Center “Kharkov Institute of Physics and Technology”, Kharkiv, Ukraine

Keywords: nanopowder ZrO2, electron accelerator, gamma-activation, X-ray diffractometry, methanol conversion

Abstract

On the example of a model system the methanol conversion influence of effects of γ-activation of nano ZrO₂-catalystes is investigated on their functional characteristics in the processes of heterogeneous catalysis. Influence of γ-activation nanopowder ZrO₂on direction and reaction yield was controled up on the series of experiments at room temperature with nominally clean ZrO₂ and with ZrO₂ with addition of nano-Fe₂O (~3%) in their initial and the γ-activated state. Activating of samples was carried out by bremsstrahlung on high-current electronic accelerator in NSC KIPT at energy of electrons 22 MeV and a current 500 μA. The features of structural transformations in γ-activated ZrO₂ were researched the method of X-ray diffractometry. It was shown that in the structure of ZrO₂ no essential changes and γ-activated particles of oxide keep monophase state and crystallinity of the initial state. Catalytic activity of ZrO₂and ZrO₂/Fe₂O₃ before and after their γ-activated was estimated on the absorbency of products of convertion reaction of methanol on the spectrophotometer of SF-46. The found out the sharp increase of activity of ZrO₂-catalystеs after their γ-activated is ascribed to synergy of factors of ionizing radiation - big ionization losses of Auger electrons near a surface ZrO₂ nanoparticles from ⁸⁹Zr - and influences of high-reactionary formations of heterogeneous catalysis.

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