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

Author:
Carneiro, Joana T., Yang, Chieh-Chao, Moulijn, Jacob A., Mul, Guido
Source:
Journal of catalysis 2011 v.277 no.2 pp. 129-133
ISSN:
0021-9517
Subject:
Fourier transform infrared spectroscopy, air flow, cyclohexanes, desorption, oxidation, photocatalysis, photocatalyst, surface area, titanium dioxide, water, water vapor
Abstract:
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.
Agid:
1002357