The effect of water presence on the photocatalytic oxidation of benzene, toluene, ethylbenzene and m-xylene in the gas-phase

Korologos, CA; Philippopoulos, CJ; Poulopoulos, SG

dc.contributor.author	Korologos, CA	en
dc.contributor.author	Philippopoulos, CJ	en
dc.contributor.author	Poulopoulos, SG	en
dc.date.accessioned	2014-03-01T01:37:19Z
dc.date.available	2014-03-01T01:37:19Z
dc.date.issued	2011	en
dc.identifier.issn	13522310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21494
dc.subject	BTEX	en
dc.subject	Langmuir-Hinshelwood kinetics	en
dc.subject	Titanium dioxide	en
dc.subject.other	Active site	en
dc.subject.other	Annular reactors	en
dc.subject.other	BTEX	en
dc.subject.other	Continuous stirred tank reactor	en
dc.subject.other	Detection limits	en
dc.subject.other	Effect of water	en
dc.subject.other	Experimental conditions	en
dc.subject.other	Experimental data	en
dc.subject.other	Gas-solid	en
dc.subject.other	Gasphase	en
dc.subject.other	Kinetic data	en
dc.subject.other	Kinetic models	en
dc.subject.other	Langmuir-Hinshelwood kinetics	en
dc.subject.other	m-Xylene	en
dc.subject.other	Parts per millions	en
dc.subject.other	Photocatalytic oxidations	en
dc.subject.other	Photocatalytic process	en
dc.subject.other	Photocatalytic reactions	en
dc.subject.other	Residence time	en
dc.subject.other	Water concentrations	en
dc.subject.other	Water vapour	en
dc.subject.other	Benzene	en
dc.subject.other	Carbon dioxide	en
dc.subject.other	Ethylbenzene	en
dc.subject.other	Isomers	en
dc.subject.other	Kinetic theory	en
dc.subject.other	Kinetics	en
dc.subject.other	Oxidation	en
dc.subject.other	Ternary systems	en
dc.subject.other	Titanium	en
dc.subject.other	Titanium dioxide	en
dc.subject.other	Toluene	en
dc.subject.other	Xylene	en
dc.subject.other	benzene	en
dc.subject.other	ethylbenzene	en
dc.subject.other	titanium dioxide	en
dc.subject.other	toluene	en
dc.subject.other	xylene	en
dc.subject.other	adsorption	en
dc.subject.other	BTEX	en
dc.subject.other	carbon dioxide	en
dc.subject.other	catalysis	en
dc.subject.other	concentration (composition)	en
dc.subject.other	experimental study	en
dc.subject.other	gas phase reaction	en
dc.subject.other	heterogeneity	en
dc.subject.other	numerical model	en
dc.subject.other	oxidation	en
dc.subject.other	oxide	en
dc.subject.other	photodegradation	en
dc.subject.other	radiation balance	en
dc.subject.other	reaction kinetics	en
dc.subject.other	ultraviolet radiation	en
dc.subject.other	water vapor	en
dc.subject.other	article	en
dc.subject.other	gas chromatography	en
dc.subject.other	mass spectrometry	en
dc.subject.other	oxidation	en
dc.subject.other	photocatalysis	en
dc.subject.other	photolysis	en
dc.subject.other	priority journal	en
dc.subject.other	ultraviolet irradiation	en
dc.subject.other	water vapor	en
dc.title	The effect of water presence on the photocatalytic oxidation of benzene, toluene, ethylbenzene and m-xylene in the gas-phase	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.atmosenv.2011.09.038	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.atmosenv.2011.09.038	en
heal.publicationDate	2011	en
heal.abstract	In the present work, the gas-solid heterogeneous photocatalytic oxidation of benzene, toluene, ethylbenzene and m-xylene (BTEX) over UV-irradiated titanium dioxide was studied in an annular reactor operated in the CSTR (continuous stirred-tank reactor) mode. GC-FID and GC-MS were used for analysing reactor inlet and outlet streams. Initial BTEX concentrations were in the low parts per million (ppmv) range, whereas the water concentration was in the range of 0-35,230 ppmv and the residence time varied from 50 to 210 s. The effect of water addition on the photocatalytic process showed strong dependence on the type of the BTEX and the water vapour concentration. The increase in residence time resulted in a considerable increase in the conversion achieved for all compounds and experimental conditions. There was a clear interaction between residence time and water presence regarding the effect on conversions achieved. It was established that conversions over 95% could be achieved by adjusting appropriately the experimental conditions and especially the water concentration in the reactor. In all cases, no by-products were detected above the detection limit and carbon dioxide was the only compound detected. Finally, various Langmuir-Hinshelwood kinetic models have been tested in the analysis of the experimental data obtained. The kinetic data obtained confirmed that water had an active participation in the photocatalytic reactions of benzene, toluene, ethylbenzene and m-xylene since the model involving reaction of BTEX and water adsorbed on different active sites yielded the most successful fitting to the experimental results for the first three compounds, whereas the kinetic model based on the assumption that reaction between VOC and water dissociatively adsorbed on the photocatalyst takes place was the most appropriate in the case of m-xylene. © 2011 Elsevier Ltd.	en
heal.journalName	Atmospheric Environment	en
dc.identifier.doi	10.1016/j.atmosenv.2011.09.038	en
dc.identifier.volume	45	en
dc.identifier.issue	39	en
dc.identifier.spage	7089	en
dc.identifier.epage	7095	en