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dc.contributor.authorChen, Y
dc.contributor.authorZhang, Y
dc.contributor.authorZou, H
dc.contributor.authorLi, M
dc.contributor.authorWang, G
dc.contributor.authorPeng, M
dc.contributor.authorZhang, J
dc.contributor.authorTang, Z
dc.date.accessioned2021-06-08T05:14:14Z
dc.date.available2021-06-08T05:14:14Z
dc.date.issued2021
dc.identifier.issn1385-8947
dc.identifier.doi10.1016/j.cej.2021.130226
dc.identifier.urihttp://hdl.handle.net/10072/404997
dc.description.abstractDifficult handling the solid catalysts remains one of the pain points in the continuous flow photochemistry. In this work, the gas–liquid-solid segmented flow was employed in the photocatalytic production of azo- compounds (azoxybenzene and azobenzene) from nitrobenzene using graphitic carbon nitride (g-C3N4) as solid catalyst. Compared with the batch reactor, the photocatalytic reaction rate was greatly improved in the microreactor, and the reaction time was shortened from 180 min of the batch to 7.5 min for near-full conversion of nitrobenzene. The effects of various reaction parameters (temperature, light source power, catalyst content) in the continuous system were examined, and the reaction kinetic was found in first order. The photocatalytic reaction performance was very sensitive to the gas–liquid-solid segmented flow conditions, which needed to be carefully tuned. With the help of high-speed camera and micro particle image velocimetry (µ-PIV) techniques, it was identified that the increasing inert gas fraction resulted in more stable segmented flow with shorter liquid segments, favoring the reaction rate. With a high gas fraction, the intensity of recirculation in the liquid segments was strengthened by the increasing total flow rate, enhancing the local mass transfer, thereby benefiting the photocatalytic reaction. Overall, the continuous microreactor reached 5.6 times higher productivity per volume (26.1 mmol/h*L) of azo- compounds than the batch reactor under the same conditions. The successful photosynthesis of azo- compounds demonstrated the great potential of the presented gas–liquid-solid segmented flow, and the findings of this work provide useful guidance on its future application in other heterogeneously catalyzed reactions.
dc.description.peerreviewedYes
dc.languageen
dc.publisherElsevier BV
dc.relation.ispartofpagefrom130226
dc.relation.ispartofjournalChemical Engineering Journal
dc.relation.ispartofvolume423
dc.subject.fieldofresearchChemical engineering
dc.subject.fieldofresearchCivil engineering
dc.subject.fieldofresearchEnvironmental engineering
dc.subject.fieldofresearchcode4004
dc.subject.fieldofresearchcode4005
dc.subject.fieldofresearchcode4011
dc.titleTuning the gas-liquid-solid segmented flow for enhanced heterogeneous photosynthesis of Azo- compounds
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationChen, Y; Zhang, Y; Zou, H; Li, M; Wang, G; Peng, M; Zhang, J; Tang, Z, Tuning the gas-liquid-solid segmented flow for enhanced heterogeneous photosynthesis of Azo- compounds, Chemical Engineering Journal, 2021, 423, pp. 130226
dc.date.updated2021-06-08T02:00:47Z
gro.hasfulltextNo Full Text
gro.griffith.authorTang, Zhiyong


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