seminario Edyta Tabor
Daniela Pietrogiacomi è lieta di invitarvi al seminario di dipartimento:
New catalysts from old structures. Design of active sites in zeolites at the atomic level
di Edyta Tabor
Department of Structure and Dynamics in Catalysis - J. Heyrovský Institute of Physical Chemistry (Czech Republic)
Abstract
Zeolites represent the widest and most important group of heterogeneous catalysts applied in chemical industry. Theirs catalytic properties are directly linked with unique combination of their structure and composition. The well-defined crystalline structure of zeolites with regular 3D channel/cavity system can be regarded as a system of nanoreactors while isomorphous substitution of Si(IV) atoms by Al(III) in the silicate framework allows stabilization of extra-framework cationic species (protons, metal (oxo)ions) acting as Brønsted and Lewis acids, redox and base active sites. The organization of Al atoms in the zeolite framework controls concentration, speciation and location of active sites in zeolite catalysts thus represents, beside the zeolite topology, the most important parameter for tuning zeolite catalysts properties. The significant effect of Al organization in zeolites and impact of the distance of active sites on acid catalysed reaction will be demonstrated over propane oligomerization and ethanol dehydration. The influence of Al organization on the nature of redox active sites (Fe, Mn, Ni or Co metal ions) embedded in various zeolite matrices will be discussed for the abatement of greenhouse N2O and for splitting of O2 or N2O with subsequent selective oxidation of methane to valuable products.
Il seminario si terrà in aula V, piano T edificio V. Caglioti CU032, venerdì 10 dicembre alle ore 12.00.
Potrà essere seguito in presenza (il numero dei posti disponibili in aula V è 28) o da remoto su piattaforma Google Meet al link meet.google.com/vvo-nxye-srt.
Edyta Tabor
Tabor is Ph.D specialized in Synthesis of zeolites with controlled Al distribution and controlled formation of metal ion active species and description of the structure of local centers on atomic level and their catalytic properties using FTIR, Mössbauer, EPR and UV-VIS spectroscopy.
Main achievements:
- Determination of the influence of Al distribution in zeolites on the mechanism of acid-base catalyzed reactions;
- Establishment of Mössbauer parameters of Fe species in zeolites active in N2O decomposition and oxidation of hydrocarbons;
- Development of inorganic analogues of enzymes, which are able to split molecular oxygen and selectively oxidize methane at room temperature.