Photocatalytic degradation of C5-C7 alkanes in the gas-phase

Boulamanti, AK; Philippopoulos, CJ

dc.contributor.author	Boulamanti, AK	en
dc.contributor.author	Philippopoulos, CJ	en
dc.date.accessioned	2014-03-01T01:31:38Z
dc.date.available	2014-03-01T01:31:38Z
dc.date.issued	2009	en
dc.identifier.issn	1352-2310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19865
dc.subject	Alkanes	en
dc.subject	Humidity	en
dc.subject	Langmuir-Hinshelwood kinetics	en
dc.subject	Molecular structure	en
dc.subject	Stereochemical structure	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	Adsorption constants	en
dc.subject.other	Alkanes	en
dc.subject.other	Ambient temperatures	en
dc.subject.other	Branched structures	en
dc.subject.other	Carbon chains	en
dc.subject.other	Feed concentrations	en
dc.subject.other	Gas-phase	en
dc.subject.other	Humidity	en
dc.subject.other	Influence of waters	en
dc.subject.other	Inhibitory effects	en
dc.subject.other	Langmuir-Hinshelwood kinetics	en
dc.subject.other	Langmuir-Hinshelwood models	en
dc.subject.other	Methyl groups	en
dc.subject.other	Photo-catalytic degradations	en
dc.subject.other	Photo-catalytic oxidations	en
dc.subject.other	Presence of waters	en
dc.subject.other	Relative humidities	en
dc.subject.other	Residence time	en
dc.subject.other	Stereochemical structure	en
dc.subject.other	Tank reactors	en
dc.subject.other	Tertiary carbon atoms	en
dc.subject.other	Water adsorptions	en
dc.subject.other	Adsorption	en
dc.subject.other	Atmospheric humidity	en
dc.subject.other	Catalyst deactivation	en
dc.subject.other	Catalyst poisoning	en
dc.subject.other	Heptane	en
dc.subject.other	Hexane	en
dc.subject.other	Isomers	en
dc.subject.other	Moisture	en
dc.subject.other	Photocatalysis	en
dc.subject.other	Photodegradation	en
dc.subject.other	Rate constants	en
dc.subject.other	Titanium	en
dc.subject.other	Volatile organic compounds	en
dc.subject.other	Water vapor	en
dc.subject.other	Paraffins	en
dc.subject.other	alkane derivative	en
dc.subject.other	heptane	en
dc.subject.other	hexane	en
dc.subject.other	pentane	en
dc.subject.other	titanium dioxide	en
dc.subject.other	volatile organic compound	en
dc.subject.other	air temperature	en
dc.subject.other	alkane	en
dc.subject.other	catalysis	en
dc.subject.other	concentration (composition)	en
dc.subject.other	humidity	en
dc.subject.other	photodegradation	en
dc.subject.other	volatile organic compound	en
dc.subject.other	water vapor	en
dc.subject.other	article	en
dc.subject.other	catalysis	en
dc.subject.other	chemical structure	en
dc.subject.other	continuous stirred tank reactor	en
dc.subject.other	environmental temperature	en
dc.subject.other	humidity	en
dc.subject.other	oxidation	en
dc.subject.other	photocatalysis	en
dc.subject.other	priority journal	en
dc.subject.other	stereochemistry	en
dc.title	Photocatalytic degradation of C5-C7 alkanes in the gas-phase	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.atmosenv.2009.03.036	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.atmosenv.2009.03.036	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The gas-phase photocatalytic oxidation (PCO) of pentane, i-pentane, hexane, i-hexane and heptane over illuminated titanium at ambient temperatures was studied in a continuous stirring-tank reactor and for different values of VOC feed concentrations and relative humidity levels. Conversions achieved were over 90% for residence times from 50 to 85 s and the only products formed were CO2 and H2O, while no catalyst deactivation was observed. The obtained results indicate that the molecular and stereochemical structures of the compounds play an important role in the reaction, as the rate was increasing with higher molecular weight, and the presence of a tertiary carbon atom enhanced the reactivity. It was also observed that the increase of the carbon chain by a methyl group had the same influence in the reaction rate in the case of both pentane and i-pentane, while the ratio of the rates for the linear and branched structure was the same for both C-5 and C-6 isomers. The presence of water in the system had an inhibitory effect in all cases. The PCO kinetics was well fit by a Langmuir-Hinshelwood model, modified so as to take into consideration the influence of water vapour. The rate constants ranged from 1.87 x 10(-7) Mol m(-2) s(-1) for pentane to 3.03 x 10(-7) mol m(-2) s(-1) for heptane, and the VOC adsorption constants from 1.14 10(4) to 2.83 10(4) m(3) mol(-1), while the water adsorption constant was 11.2 m(3) mol(-1). (C) 2009 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Atmospheric Environment	en
dc.identifier.doi	10.1016/j.atmosenv.2009.03.036	en
dc.identifier.isi	ISI:000267117100002	en
dc.identifier.volume	43	en
dc.identifier.issue	20	en
dc.identifier.spage	3168	en
dc.identifier.epage	3174	en