Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/106052
Author(s): Ricardo A. R. Monteiro
Sandra M. Miranda
Caio Rodrigues Silva
Joaquim L. Faria
Adrián M. T. Silva
Rui A. R. Boaventura
Vítor J. P. Vilar
Title: Gas phase oxidation of n-decane and PCE by photocatalysis using an annular photoreactor packed with a monolithic catalytic bed coated with P25 and PC500
Issue Date: 2015
Abstract: Perchloroethylene (PCE) and n-decane are persistently present in the indoor air of several industrial/corporate: facilities and households. The present paper reports studies on the photocatalytic oxidation (PCO) of n-decane and PCE using an annular photoreactor equipped with a compound parabolic collector (CPC) and packed with transparent cellulose acetate monolithic structures coated with two commercially, available TiO2, namely PC500 and P25, under simulated solar light. Such configuration allowed the illumination of the whole tubular reactor perimeter and catalytic bed, enhancing therefore the photonic efficiency and to take advantage of the low pressure drop and the high surface-area-to-volume ratio, typical of honeycomb reactors. The influence of the type of TiO2, feed flow rate, pollutant concentration, relative humidity, gas-phase molecular oxygen and irradiance on the pollutants PCO was assessed. PC500 film showed higher conversion of both pollutants in comparison with P25 despite the lower mass of catalyst used for film coating. n-Decane (C-dec,C-feed =71 ppm) and PCE (C-PCE,C-feed =1095 ppm) conversions close to 100% were obtained operating at Q(feed) = 150 cm(3) min(-1) (tau = 88 s), I = 38.4 W-UV m(-2) and RH = 40%. The mineralization's of PCE over both photocatalytic films were similar. However, n-decane was 100% and 69% mineralized respectively over PC500 and P25 films, under the same operating conditions. In addition, competitive adsorption between the pollutants and water molecules on the TiO2 film surface was observed above 20% of RH. Results obtained at low RH suggest that Cl-center dot radical chain propagation reactions may be included in the PCO mechanism of PCE. Finally, the absence of oxygen drastically impairs the photoreaction.
Subject: Tecnologia ambiental, Engenharia do ambiente
Environmental technology, Environmental engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia do ambiente
Engineering and technology::Environmental engineering
URI: https://hdl.handle.net/10216/106052
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/100554/2008/AIRPHOTOXI-DESTOXIFICAÇÃO SOLAR DE AR INTERIOR: BIOAEROSSÓIS E COVs/AIRPHOTOXI
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20
info:eu-repo/grantAgreement/Autoriadade de Gestão do Programa Operacional Regional do Norte/Programas Integrados de IC&DT/NORTE-07-0124-FEDER-000015/Catalysis and Materials/LSRE/LCM LA - RL2_P4
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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