Contribution information

Title Photocatalytic reduction of carbon dioxide in presence photocatalysts Fe2O3/CeO2
Status Not decided yet
Type Poster
Session Reaction engineering and catalysis
Authors K., Kočí1, M., Antes2, N., Ambrožová3, L., Čapek4, L., Chlebíková5, M., Valášková6
1 VŠB-Technical University of Ostrava, Institute of Environmental Technology, Ostrava - Poruba, Czechia
2 VŠB-Technical University of Ostrava, Ostrava - Poruba, Czechia
3 VŠB-Technical University of Ostrava, Institute of Environmental Technology, Ostrava - Poruba, Czechia
4 University of Pardubice, Faculty of Chemical Technology, Pardubice, Czechia
5 VŠB-Technical University of Ostrava, Nanotechnology Centre, Ostrava - Poruba, Czechia
6 VŠB-Technical University of Ostrava, Institute of Environmental Technology, Ostrava - Poruba, Czechia
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Brief content Carbon dioxide is among the greenhouse gases that contribute to the greenhouse effect. Heterogeneous photocatalysis is one of potential approaches for mitigation of carbon dioxide emission. Reducing CO2 with H2O through photocatalysis is important in the development of solar energy based on carbon neutral cycle. The αFe2O3/CeO2 photocatalysts were prepared by the precipitation procedure from the iron chloride hexahydrate (FeCl3∙6H2O) and cerium nitrate hexahydrate (Ce(NO3)3·6H2O) precursors and NH4OH precipitator. Crystalline nanoparticles mixture of α-Fe2O3 (hematite) and CeO2 (ceria) were obtained by calcination at 500 °C for 4 hours. Textural, structural, optical and electronic properties of αFe2O3/CeO2 photocatalysts were characterized in detail by using nitrogen physisorption, powder X-ray diffraction and diffuse reflectance UV-Vis spectroscopy. The photocatalytic reduction of the CO2 was carried out in a homemade stirred batch reactor at ambient temperature (Fig. 1). The gaseous products were analysed on a highly sensitive gas chromatograph with a barrier discharge ionization detector (BID). The effect of irradiation time on the formation of products in the photocatalytic reduction of CO2 was investigated over investigated photocatalysts. Methane, carbon monoxide and hydrogen were recognized as the gaseous products of reaction. The key role in the CO2 photocatalytic reduction played the separation of electrons and holes, which were markedly affected by the different ratio of αFe2O3/CeO2.
ID 246