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N.V. Gelfond

N.V. Gelfond
"Physicochemical regularities of the formation of nanostructurized metal and oxide layers in the processes of chemical deposition from vapors of metal compounds with organic ligands"

The seminar will be held on May 21, Friday, 10:00,

Dr. Nikolai Vasilievich Gelfond (Nikolaev Institute of Inorganic Chemistry SB RAS). Discussion of the Dr. Sci. Thesis in Chemistry; specialization 02.00.04, physical chemistry

Referees:
1. Prof. Z.R Ismagilov
2. Prof. S.V. Korenev (the Nikolaev Institute of Inorganic Chemistry SB RAS)


M.N. Timofeeva

M.N. Timofeeva
"Acidity and catalytic properties of homogeneous and heterogeneous systems based on heteropoly compounds "

The seminar will be held on June 16, 2010, 15:00, Conference Hall

Dr.Sci. Thesis in chemistry
specialization 02.00.15, catalysis

Scientific consultant: Prof. V.A. Likholobov, Corresponding Member of the Russian Ac.Sci.
Referees: Prof. K.Yu. Koltunov, Prof. V.N. Panfilov

Abstract

Relevance of the work

For many years, numerous researchers pay attention to heteropoly compounds and heteropoly acids (HPA) with unique physicochemical properties as the objects for investigation of fundamental and applied aspects of catalysis. While more than 100 HPA with different structures and compositions are known from literature, the Keggin-structure HPA are only characterized in sufficient detail regarding their acidic and acid catalytic properties. The progress in the field of catalysis with other structure HPA has made it necessary to acquire quantitative data on their acidity and to identify principal factors affecting their activity. An additional problem in applying HPA for catalysis is the one of HPA separation from the reaction products followed by their regeneration. The insufficient and contradictory data on the acidity and surface state of bulk and, in particular, supported HPA hinder the progress in the field of heterogeneous catalysis with HPA. It is of extreme importance for fine synthesis to resolve these problems.

Purpose

The work was mainly aimed at developing scientific basis of acidic catalysis by heteropoly compounds and heteropoly acids of different structures and compositions in liquid-phase homogeneous and heterogeneous processes. The studies were focused on (a) acidic and acid-catalytic properties of bulk and supported heteropoly acids, and (b) main factors affecting the HPA activity to liquid-phase homogeneous and heterogeneous processes.

Objects under study

The studies were focused on the relations between (a) composition, structure and acidity of HPA of five structural types to identify main factors affecting their catalytic activity to homogeneous acid catalysis; (b) the nature of surface functional groups of the support, quantity and strength of surface acidic sites of HPA, and catalytic activity of the supported HPA to heterogeneous acid catalysis; (c) synthetic procedures of micro- and mesoporous aluminosilicate systems based on Al- and Al,Fe-polyoxocations of the Keggin structure, composition, acid and catalytic properties of these materials in acid and oxidative catalysis.

Main Sections:

  • Results of studies of acid properties of five structure types HPA (Keggin structure (H3PW12O40, H4SiW12O40, H5PW11XO40, where X =Ti4+ and Zr4+), Dawson structure (α-H6P2W18O62), H6P2W21O71, H6As2W21O69 and H21B3W39O132) in aqueous and organic media and relations between HPA composition and structure, acidity and catalytic properties;
  • Results obtained by studying acid and acid-catalytic properties of HPA/support systems (where support is SiO2, Sibunit, F-Sibunit, CFC and N-CFC) and established relations between the support nature, quantity and strength of the surface acid centers and catalytic properties;
  • Development of methods for synthesis of microporous systems using the Keggin+ structure Al polyoxocation and layered montmorillonite structure aluminosilicate; Results obtained by studying relations between the nature of surface acid and base centers and catalytic activity of the aluminosilicate systems to condensation of acetone and addition of methanol to propylene oxide;
  • Development of methods for synthesis of microporous and mesoporous systems using the Keggin structure Al,Fe polyoxocation; Results obtained by studying relations between the nature of surface acid and base centers and catalytic activity of the aluminosilicate systems to oxidation of phenol and azo dye Acid Chrome Dark Blue with hydrogen peroxide.

Conclusions

The work contributes to wider application of heteropoly compounds of different structure types owing to understanding of certain regularities of the nature of their activities both to acid and base catalysis.

Personal contribution of the author
All the results presented are obtained by the author either b y herself or under her guidance. The author formulated the problem and aims of the work.

Publications:
One review paper, 34 papers, 22 abstracts of presentations on the subject of the Thesis.

Acknowledgements
The author is grateful to the scientific consultant and to all the co-authors.



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