Effect of Silver Doping on the TiO2 for Photocatalytic Reduction of CO2

0345255 - ÚCHP 2011 SK eng C - Conference Paper (international conference)
Kočí, K. - Matějů, K. - Obalová, L. - Krejčíková, Simona - Lacný, Z. - Plachá, D. - Čapek, L. - Hospodková, Alice - Šolcová, Olga
Effect of Silver Doping on the TiO2 for Photocatalytic Reduction of CO2.
Proceedings. Bratislava: Slovak University of Technology, 2010 - (Markoš, J.), s. 204. ISBN 978-80-227-3290-1.
[International Conference of Slovak Society of Chemical Engineering /37./. Tatranské Matliare (SK), 24.05.2010-28.05.2010]
R&D Projects: GA ČR GD203/08/H032; GA AV ČR KAN400720701
Institutional research plan: CEZ:AV0Z40720504; CEZ:AV0Z10100521
Keywords : Ag doping * TiO2 * CO2 reduction
Subject RIV: CF - Physical ; Theoretical Chemistry

Pure TiO2 and various silver-enriched TiO2 powders were prepared by the sol-gel process controlled in the reverse micellar environment. The catalysts were tested in CO2 photocatalytic reduction and characterized by X-ray diffraction (XRD), nitrogen adsorption measurement and UV–Vis. Methane and methanol were the main reduction products. The yield of methane and methanol increase when modifying the TiO2 by silver incorporation is caused by two mechanisms: up to 5% of Ag in TiO2 the Ag impurity band inside the TiO2 bandgap decreases the absorption edge and increases so the electron-hole pair generation, above 5% of Ag in TiO2 Ag metallic clusters are formed in TiO2 crystals with Shottky barrier at the metal–semiconductor interface, which spatially separates electron and holes and increases their lifetime (decreases probability of their recombination).
Permanent Link: http://hdl.handle.net/11104/0186571