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Optimization of cerium doping of TiO2 for photocatalytic reduction of CO2 and photocatalytic decomposition of N2O
Authors: Koci Kamila | Matejova Lenka | Ambrozova Nela | Sihor Marcel | Troppova Ivana | Čapek Libor | Kotarba Andrzej | Kustrowski Piotr | Hospodkova Alice | Obalova Lucie
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Journal of Sol-Gel Science and Technology
Publisher name: Springer
Place: Heidelberg
Page from-to: 550-558
Titles:
Language Name Abstract Keywords
cze Optimalizace obsahu Ce v TiO2 pro fotokatalytickou redukci CO2 a fotokatalytický rozklad N2O Ce obsahující TiO2 fotokatalyzátory (0 - 0,8 mol.% Ce) byly připraveny sol-gel metodou. Textura, strukturní, optické a elektronické vlastnosti Ce/TiO2 fotokatalyzátorů byly stanoveny na základě fyzisorpce, XRD, DR-UV-VIS a měření rozdílu kontaktního potenciálu. Dále byla testována katalytická aktivita připravených katalyzátorů ve fotokatalytické redukci CO2 a rozkladu N2O. fotokatalýza; skleníkové plyny; TiO2; Ce; N2O; CO2
eng Optimization of cerium doping of TiO2 for photocatalytic reduction of CO2 and photocatalytic decomposition of N2O 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/TiO2 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 TiO2 (1) decreased the anatase crystallite size, which corresponded to the increase in specific surface area of the photocatalysts, and (2) decreased the absorption edge (shifting the spectral response toward the visible light region). The prepared photocatalysts were tested for CO2 photocatalytic reduction in a stirred batch annular reactor, and methane was a main product. The photocatalytic decomposition of nitrous oxide was carried out in batch reactor with circulation, and only oxygen and nitrogen were detected as reaction products. 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 TiO2 by cerium. Photocatalysis; Greenhouse gases; TiO2; Ce; N2O; CO2

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