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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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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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container_start_page	129
container_title	Journal of catalysis
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creator	Carneiro, Joana T Yang, Chieh-Chao Moulijn, Jacob A Mul, Guido
description	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.
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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
title	effect of water on the performance of TiO₂ in photocatalytic selective alkane oxidation
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