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Molecular sieves isomorphously substituted by group 5 metals- synthesis, modification and surface properties

Anna Wojtaszek-Gurdak

Abstract

Isomorphous substitution of metals at +5 oxidation degree gives materials of unique properties. Many methods have been proposed for the introduction of metals into the zeolite structure, e.g. by the synthesis in hydrothermal conditions and post-synthesis modification. The aim of the doctoral dissertation was to develop methods for the synthesis of new catalysts containing group 5 metals isomorphically substituted into the zeolite Y structure and to establish their texture/structure, surface properties and catalytic performance in gas and liquid phase reactions. The proposed methods of syntheses were optimised to ensure the most effective introduction of the transition metal into the zeolite skeleton. Also a comparative analysis was made of the effectiveness of vanadium, niobium and tantalum introduction into zeolites and the surface and catalytic properties of the systems obtained. Another objective of the study was to check the effects of post-synthesis modification of niobium or tantalum containing zeolites with gold. The experimental results are supported with those of theoretical calculations. The methods of syntheses of group 5 metal containing zeolites and their characterisation also by DFT calculations make the element of novelty brought by the studies performed. The most important novelty of the study is proving the possibility of generation of basic properties in zeolites by introduction of niobium and tantalum.
Record ID
UAM23a070df71cc46c5890225757dba575a
Diploma type
Doctor of Philosophy
Author
Anna Wojtaszek-Gurdak (DoHC) Anna Wojtaszek-Gurdak,,
Title in Polish
Sita molekularne izomorficznie podstawione metalami grupy 5 – synteza, modyfikacja i właściwości powierzchniowe
Title in English
Molecular sieves isomorphously substituted by group 5 metals- synthesis, modification and surface properties
Language
pl Polish
Certifying Unit
Faculty of Chemistry (SNŚ/WC/FoC)
Discipline
chemistry / (chemical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.5 chemical sciences
Defense Date
21-06-2012
Title date
21-06-2012
Supervisor
URL
http://hdl.handle.net/10593/2812 opening in a new tab
Keywords in English
niobium, tantalum, zeolite Y, hydrothermal synthesis
Abstract in English
Isomorphous substitution of metals at +5 oxidation degree gives materials of unique properties. Many methods have been proposed for the introduction of metals into the zeolite structure, e.g. by the synthesis in hydrothermal conditions and post-synthesis modification. The aim of the doctoral dissertation was to develop methods for the synthesis of new catalysts containing group 5 metals isomorphically substituted into the zeolite Y structure and to establish their texture/structure, surface properties and catalytic performance in gas and liquid phase reactions. The proposed methods of syntheses were optimised to ensure the most effective introduction of the transition metal into the zeolite skeleton. Also a comparative analysis was made of the effectiveness of vanadium, niobium and tantalum introduction into zeolites and the surface and catalytic properties of the systems obtained. Another objective of the study was to check the effects of post-synthesis modification of niobium or tantalum containing zeolites with gold. The experimental results are supported with those of theoretical calculations. The methods of syntheses of group 5 metal containing zeolites and their characterisation also by DFT calculations make the element of novelty brought by the studies performed. The most important novelty of the study is proving the possibility of generation of basic properties in zeolites by introduction of niobium and tantalum.

Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM23a070df71cc46c5890225757dba575a/

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