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Title: Differences in the vapour phase photocatalytic degradation of ammonia and ethanol in the presence of water as a function of TiO2 characteristics and the presence of O2
Authors: Sola, A. C.
Garzón Sousa, D. 
Araña, J. 
González Díaz, O. 
Doña Rodríguez, J. M. 
Ramírez De La Piscina, P.
Homs, N.
UNESCO Clasification: 2210 Química física
221001 Catálisis
Keywords: TiO2
CO adsorption
NH3 and ethanol photodegradation
Aerobic/anaerobic photocatalysis
Issue Date: 2016
Journal: Catalysis Today 
Conference: 3rd Latin-American Congress of Photocatalysis, Photochemistry and Photobiology (LACP)
Abstract: Differences in the gas-phase photocatalytic degradation of NH3 and ethanol in the presence of water over two commercial TiO2 materials with different structural characteristics (Evonik's P25 (P25) and Sigma Aldrich's anatase (SA)) were established here using FTIR. The materials were characterized using different techniques including BET, XRD, UV–vis DRS and XPS. The interaction of CO probe molecule with the oxides was evaluated via calorimetry and by in-situ DRIFTS coupled to on-line mass spectrometry. This allowed us to determine differences in the surface properties of the two TiO2 materials. NOx− surface species became evident during the photodegradation of adsorbed NH3 over both SA and P25. However, while surface bidentate nitrate species remained strongly bound to P25, the surface species were fully eliminated from SA. Differences in the photocatalytic degradation of ethanol over P25 and SA were also determined. Ethanol adsorption and its evolution were largely independent of the presence of oxygen for SA, but oxygen affected these processes for P25.
ISSN: 0920-5861
DOI: 10.1016/j.cattod.2015.08.008
Source: Catalysis Today [ISSN 0920-5861], v. 266, p. 53-61
Appears in Collections:Actas de congresos
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