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Title: Gas-phase ethanol photocatalytic degradation study with TiO2 doped with Fe, Pd and Cu
Authors: Araña, J. 
Doña-Rodríguez, J. M. 
González-Díaz, O. 
Tello Rendón, E. 
Herrera Melián, J. A. 
Colón, Gerardo
Navío, Jose Antonio
Pérez Peña, J. 
UNESCO Clasification: 330301 Tecnología de la catálisis
Keywords: Photocatalysis
Ti-O2 doped
Issue Date: 2004
Journal: Journal of Molecular Catalysis A: Chemical 
Abstract: Ethanol degradation by TiO2 and TiO2 doped with Fe, Pd and Cu has undergone FTIR spectroscopic study. Ethanol interaction with bare-TiO2 and Fe-TiO2 yields the formation of ethoxides on the catalyst surface that can readily be oxidised to acetates by radicals O2− and OH. Conversely, ethanol interaction with Pd-TiO2 and Cu-TiO2 generates an intermediate species between ethanol and ethyleneglycol. Acetate-producing oxidation of these latter species is inhibited because electrons that form radicals O2− are captured by the respective metallic oxides. In these catalysts a degradation mechanism based on ethanol reaction with photogenerated holes is proposed. Also, different surfacial OH distributions determine ethanol–catalyst interactions. Furthermore, ethanol degradation has been studied in a gaseous continuous flow system. Exhaust gases have been analysed by means of GC and FTIR. These experiments demonstrate that bare-TiO2 and Fe-TiO2 degrade ethanol to provide only acetaldehyde and their catalytic activity progressively decays over time. On the contrary, Pd-TiO2 and Cu-TiO2 have produced ethyleneglycol in addition to acetaldehyde. No deactivation of these catalysts was observed during the experimental time period (6 h). During the gas-phase ethanol photocatalytic degradation in a continuos flow system, bare-TiO2 and Fe-TiO2 are deactivated in opposition to what was observed for Pd-TiO2 and Cu-TiO2. Pd and Cu oxide deposits can be capturing the photogenerated electrons, thus avoiding the formation of O2− radicals that generate acetates.
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2004.01.020
Source: Journal of Molecular Catalysis A: Chemical [ISSN 1381-1169], v. 215 (1-2), p. 153-160
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