Welcome to my
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Scientific degree: PhD
Address:
Reaction Kinetics and Surface Chemistry Research Group
6720,
Phone: +36-62-343586
Phone/Fax:
+36-62-420678
E-mail: sir@chem.u-szeged.hu
Research interest:
I have been working in the
Reaction Kinetics and Surface Chemistry Research Group from the university
years. The model-systems of different heterogeneous reactions catalyzed by
metals are investigated in the RKSCRG on single crystal metal and metal oxide surfaces
under Ultra High Vacuum (UHV) conditions. The UHV analytical tools I have been using
in these studies on the one hand belong to surface spectroscopic methods, which
allow elemental (Auger Electron Spectroscopy; AES, X-ray Photoelectron
Spectroscopy; XPS) and molecular (High Resolution Electron Energy Loss
Spectroscopy, Reflexion Absorption Infrared
Spectroscopy) identification of the surface intermediates and on the other hand
to mass spectroscopic ones (Pulsed Field Desorption Mass Spectrometry,
Secondary Ion Mass Spectroscopy, Thermal Desorption Spectroscopy), by which one
can analyze the composition and quantities of gaseous products. By means of
Field Emission Microscopy and Scanning Tunneling Microscopy one can get
information on the surface structure of substrate and adspecies
at atomic resolution at best.
The above-mentioned UHV
techniques have been used to study the elementary steps (adsorption,
decomposition, diffusion, reaction and desorption) of heterogeneous catalytic
processes. The investigated systems are the noble metal and Mo2C
catalyzed surface reactions of simple molecules (like C2N2,
H2O, NO, N2, CO, CO2, CnH2n-1I,
etc.). The motivation of these studies was to establish the energetic,
quantitative and kinetic parameters of heterogeneous catalytic reactions for
either eliminating harmful compounds or synthesize more valuable products from
small molecules. The effect of surface additives, like the electropositive
(electron-sending) potassium and electronegative (electron-withdrawing) oxygen
species was also studied.
To bridge the so-called
material and complexity gap between model and real heterogeneous catalysts, the
investigation of oxide-supported, nano-sized metal
particles is also of interest. Beside XPS and AES, the highly surface sensitive
Low Energy Ion Scattering is used to study the structural changes, wetting
properties, thermal stability, etc. of bimetallic systems, like TiO2+Mo+Au,
TiO2+Rh+Au, etc. The effect of atomically thin oxide layers, like TiOx and MoOx
on the structure and catalytic activity of platinum metal (mostly rhodium) particles
is being studied. The properties of metal-oxide-metal (MOM) structures are also
investigated in relation to solar energy conversion.