effect of water on the performance of TiO₂ in photocatalytic selective alkane oxidation

Deactivation of TiO₂ is hampering practical implementation of photocatalytic alternatives for energetically intensive selective oxidation processes. In the present study, humidification of the air stream is demonstrated to be a solution to this problem for well-defined photocatalysts, such as Solaro...

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Bibliographic Details
Published in:Journal of catalysis 2011-01, Vol.277 (2), p.129-133
Main Authors: Carneiro, Joana T, Yang, Chieh-Chao, Moulijn, Jacob A, Mul, Guido
Format: Article
Language:English
Subjects:
air flow
Alkalinity
Catalysis
Chemistry
cyclohexanes
desorption
Exact sciences and technology
Fourier transform infrared spectroscopy
General and physical chemistry
Oxidation
Photocatalysis
photocatalyst
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
surface area
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
titanium dioxide
Water
water vapor
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Summary:Deactivation of TiO₂ is hampering practical implementation of photocatalytic alternatives for energetically intensive selective oxidation processes. In the present study, humidification of the air stream is demonstrated to be a solution to this problem for well-defined photocatalysts, such as Solaronix TiO₂, in selective oxidation of cyclohexane. Water establishes enhanced product desorption and stimulates decomposition of deactivating surface carboxylate species, as clearly demonstrated by ATR-FTIR spectroscopy. For high surface area TiO₂, such as Hombikat UV100, water molecules adsorb too strongly, and addition of water vapor to the air stream is detrimental to catalyst performance.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2010.10.019