Physical-chemical properties of VPO-catalysts surface modified by ions of transition metals

Authors

  • E. V. Kiziun Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine
  • V. A. Zazhigalov Institute for Sorption and Problems of Endoecology of National Academy of Sciences of Ukraine

Keywords:

vanadium phosphate catalysts, modification with ions of transition metal, surface acid sites

Abstract

An influence of the modification with the transition metal ions (Me= Ti, Fe, Zr, Мо, La, W, Ag, Ni ) on physical-chemical properties of VPO-composition surface was studied. VPMeO-samples were investigated by the X-ray phase analysis, X-ray photoelectron spectroscopy, differential thermal analysis and scanning electron microscopy methods. Types of acidic centers were defined by dimethylpyridine and 2,6-dimethylpyridine adsorption. It has been found established that the introduction of the additives and the variation of their concentration (Ме/V=0.05–0.4) in the VPO-matrix do not influences on its composition most has, with the exception of additives Mo, La and Ti. It has been shown that VPO-composition promoted with transitional metal ions modifies its morphology, O1S-electrons binding energy, atomic ratio P/V and the quantity of acidic sites on its surface. It has been found that the change of surface acidic properties of VPMeO-samples by means of additives introduction is characterized by Lewis acidity essentially.

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Kiziun, E. V.; Zazhigalov, V. A. Physical-Chemical Properties of VPO-Catalysts Surface Modified by Ions of Transition Metals. Him. Fiz. Tehnol. Poverhni 2014, 5, 30-41.

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Vol. 5 No. 1 (2014): Chemistry, Physics and Technology of Surface / Himia, Fizika ta Tehnologia Poverhni

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