ICCT Mikulov 2016 PHOTOCATALYTIC REDUCTION OF CO2

ICCT Mikulov 2016
PHOTOCATALYTIC REDUCTION OF CO2 OVER Ce/TiO2 PHOTOCATALYSTS
Kočí, K. 1,2,3, Matějová, L. 1, Ambrožová N. 1,2, Šihor M. 1,2, Troppová I. 1, Čapek L.4, Kotarba A.5, Kustrowski P.5,
Obalová L.1,2
1
Institute of Environmental Technology , 2Faculty of Metallurgy and Materials Engineering, VŠB – Technical
University of Ostrava 17. listopadu 15, 708 33 Ostrava, Czech Republic
[email protected]
1
Institute of Environmental Technology, 2Faculty of Metallurgy and Material Engineering, 3Energy Units for
Utilization of non Traditional Energy Sources, VŠB - Technical University of Ostrava, 17. listopadu 15/2172, 708
33 Ostrava – Poruba, Czech Republic, 4Department of Physical Chemistry, Faculty of Chemical Technology,
University of Pardubice, Studentská 95, 532 10 Pardubice, Czech Republic, 5Jagiellonian University, Ingardena 3,
30-060 Krakow, Poland
[email protected]
The cerium doped TiO2 photocatalysts (0 – 0.8 mol.% Ce) were prepared by using a sol-gel method. Textural,
structural, optical and electronic properties of Ce/TiO 2 photocatalysts were characterized in detail by using
nitrogen physisorption, powder X-ray diffraction, diffuse reflectance UV-Vis spectroscopy and contact potential
difference measurements. It was proved that increasing amount of cerium ions in TiO 2 (i) decreased the
anatase crystallite size, which corresponded to the increase of specific surface area of the photocatalysts and
(ii) decreased the absorption edge (shifting the spectral response towards the visible light region). The
prepared photocatalysts were tested for CO2 photocatalytic reduction in a stirred batch annular reactor,
methane was a main product. It was found out that the energies of electrons and holes played the key role in
both photocatalytic reactions and can be markedly affected by doping of TiO 2 by cerium.
Acknowledgment
The presented work was financially supported by Grant Agency of the Czech Republic (project no. 14-35327J and
14-23274S), by Ministry of Education, Youth and Sports of the Czech Republic in the “National Feasibility
Program I”, the projects LO1208 „TEWEP” and by the project of specific research SP2016/62, VSB - TU Ostrava.