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Article: Toluene degradation over Mn-TiO2/CeO2 composite catalyst under vacuum ultraviolet (VUV) irradiation

TitleToluene degradation over Mn-TiO2/CeO2 composite catalyst under vacuum ultraviolet (VUV) irradiation
Authors
KeywordsMn-TiO2
Mesoporous CeO2
VUV irradiation
VOCs degradation
Catalytic ozonation
Issue Date2019
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ces
Citation
Chemical Engineering Science, 2019, v. 195, p. 985-994 How to Cite?
AbstractVolatile organic compounds (VOCs) are attracting more and more attention among all the air pollutants. Photocatalytic oxidation under vacuum ultraviolet (VUV) irradiation presents a novel and promising process for VOC degradation while also generating ozone as a byproduct. To improve the degradation efficiency of VOCs and remove the residual ozone Mn-TiO 2 /mesoporous CeO 2 composite catalysts were developed and used as a catalyst in a VUV-PCO system for toluene degradation. Characterizations including SEM, TEM, BET, XRD, XPS, Raman and H 2 -TPR, were conducted to examine the physical and chemical features of the synthetic samples. Results of a toluene degradation test showed that the Mn-TiO 2 /CeO 2 catalyst had superior activity in removing toluene and ozone to Mn-TiO 2 and pure CeO 2 . The toluene removal efficiencies of the catalysts with a different molar ratio of Ti/Ce were found to be in the order of Mn-TiO 2 /CeO 2 (1:1) > Mn-TiO 2 /CeO 2 (1:2) > Mn-TiO 2 /CeO 2 (2:1). The mineralization rate increased in the order of Mn-TiO 2 /CeO 2 (1:1) > Mn-TiO 2 /CeO 2 (2:1) ≈ Mn-TiO 2 > Mn-TiO 2 /CeO 2 (1:2) > CeO 2 > VUV photolysis. High ozone removal rates of over 99.9% were obtained for all the doped samples with Mn, resulting in a residual ozone lower than 0.12 ppm. With the use of the scavenger tert-butanol (TBA) and the electron spin resonance (ESR) test, hydroxyl radicals ( [rad] OH) were found to play a significant role in toluene oxidation in the VUV-PCO process and ozone is also involved in the formation of [rad] OH.
Persistent Identifierhttp://hdl.handle.net/10722/272262
ISSN
2017 Impact Factor: 3.306
2015 SCImago Journal Rankings: 1.073
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWu, M-
dc.contributor.authorLeung, DYC-
dc.contributor.authorZhang, Y-
dc.contributor.authorHuang, H-
dc.contributor.authorXie, R-
dc.contributor.authorSzeto, W-
dc.contributor.authorLi, F-
dc.date.accessioned2019-07-20T10:38:50Z-
dc.date.available2019-07-20T10:38:50Z-
dc.date.issued2019-
dc.identifier.citationChemical Engineering Science, 2019, v. 195, p. 985-994-
dc.identifier.issn0009-2509-
dc.identifier.urihttp://hdl.handle.net/10722/272262-
dc.description.abstractVolatile organic compounds (VOCs) are attracting more and more attention among all the air pollutants. Photocatalytic oxidation under vacuum ultraviolet (VUV) irradiation presents a novel and promising process for VOC degradation while also generating ozone as a byproduct. To improve the degradation efficiency of VOCs and remove the residual ozone Mn-TiO 2 /mesoporous CeO 2 composite catalysts were developed and used as a catalyst in a VUV-PCO system for toluene degradation. Characterizations including SEM, TEM, BET, XRD, XPS, Raman and H 2 -TPR, were conducted to examine the physical and chemical features of the synthetic samples. Results of a toluene degradation test showed that the Mn-TiO 2 /CeO 2 catalyst had superior activity in removing toluene and ozone to Mn-TiO 2 and pure CeO 2 . The toluene removal efficiencies of the catalysts with a different molar ratio of Ti/Ce were found to be in the order of Mn-TiO 2 /CeO 2 (1:1) > Mn-TiO 2 /CeO 2 (1:2) > Mn-TiO 2 /CeO 2 (2:1). The mineralization rate increased in the order of Mn-TiO 2 /CeO 2 (1:1) > Mn-TiO 2 /CeO 2 (2:1) ≈ Mn-TiO 2 > Mn-TiO 2 /CeO 2 (1:2) > CeO 2 > VUV photolysis. High ozone removal rates of over 99.9% were obtained for all the doped samples with Mn, resulting in a residual ozone lower than 0.12 ppm. With the use of the scavenger tert-butanol (TBA) and the electron spin resonance (ESR) test, hydroxyl radicals ( [rad] OH) were found to play a significant role in toluene oxidation in the VUV-PCO process and ozone is also involved in the formation of [rad] OH.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ces-
dc.relation.ispartofChemical Engineering Science-
dc.subjectMn-TiO2-
dc.subjectMesoporous CeO2-
dc.subjectVUV irradiation-
dc.subjectVOCs degradation-
dc.subjectCatalytic ozonation-
dc.titleToluene degradation over Mn-TiO2/CeO2 composite catalyst under vacuum ultraviolet (VUV) irradiation-
dc.typeArticle-
dc.identifier.emailLeung, DYC: ycleung@hku.hk-
dc.identifier.authorityLeung, DYC=rp00149-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ces.2018.10.044-
dc.identifier.scopuseid_2-s2.0-85055644797-
dc.identifier.hkuros299100-
dc.identifier.volume195-
dc.identifier.spage985-
dc.identifier.epage994-
dc.identifier.isiWOS:000454148500086-
dc.publisher.placeUnited Kingdom-

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