Pickering emulsion enhanced interfacial catalysis under Taylor flow in a microchannel reactor
Pickering emulsion enhanced interfacial catalysis under Taylor flow in a microchannel reactor
There are still technical challenges associated with surface fouling and clogging in microchannels when conducting multiphase catalytic reactions involving solid particles. In this study, a Pickering emulsion was employed to enhance the oxidation of benzyl alcohol (BNOH) catalyzed by Pd/SiO2 nanoparticles under Taylor flow in a microchannel reactor. The reaction characteristics of benzyl alcohol/water Pickering emulsion in a microchannel reactor were studied experimentally. The characteristic results showed that the O/W Picking emulsion system was superior to the W/O Picking emulsion system for the catalytic oxidation reaction. The influences of a wide range of operational variables were characterized on the conversion of reactants and the selectivity of the desired product. The optimized reaction conditions included: reaction temperature 403 K, CB 5 wt%, O2/BNOH (mol/mol) 0.76 and tube length 8 m. Under the optimal operating conditions, the conversion of BNOH and the selectivity of benzaldehyde were found to be 86.53% and 99.79%, respectively. In addition, the interfacial transport-reaction mechanism in Pickering emulsions under Taylor flow in microchannels was proposed from the perspective of multiphase mass transfer. This development provided significant insights and guiding for effectively performing multiphase catalytic reactions involving solid catalyst particles in microchannel reactors.
Mass transfer, Microchannel, Microreactor, Multiphase flow, Oxidation, Pickering emulsion
Li, Hongye
aec83710-7cd5-4547-9074-c033b7fb67be
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Wang, Qingqiang
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Jin, Nan
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Wei, Haisheng
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Zhao, Yuchao
0b5eafdf-0011-4a02-840f-e5b88b61a708
15 June 2023
Li, Hongye
aec83710-7cd5-4547-9074-c033b7fb67be
Zhang, Xunli
d7cf1181-3276-4da1-9150-e212b333abb1
Wang, Qingqiang
5f80e94c-3f20-4923-9f5b-aa532056083f
Jin, Nan
4c238610-7344-4b96-aeef-f039b663691c
Wei, Haisheng
3cc727a5-2182-4446-a4ab-1ce6951d2b11
Zhao, Yuchao
0b5eafdf-0011-4a02-840f-e5b88b61a708
Li, Hongye, Zhang, Xunli, Wang, Qingqiang, Jin, Nan, Wei, Haisheng and Zhao, Yuchao
(2023)
Pickering emulsion enhanced interfacial catalysis under Taylor flow in a microchannel reactor.
Chemical Engineering Journal, 466, [143258].
(doi:10.1016/j.cej.2023.143258).
Abstract
There are still technical challenges associated with surface fouling and clogging in microchannels when conducting multiphase catalytic reactions involving solid particles. In this study, a Pickering emulsion was employed to enhance the oxidation of benzyl alcohol (BNOH) catalyzed by Pd/SiO2 nanoparticles under Taylor flow in a microchannel reactor. The reaction characteristics of benzyl alcohol/water Pickering emulsion in a microchannel reactor were studied experimentally. The characteristic results showed that the O/W Picking emulsion system was superior to the W/O Picking emulsion system for the catalytic oxidation reaction. The influences of a wide range of operational variables were characterized on the conversion of reactants and the selectivity of the desired product. The optimized reaction conditions included: reaction temperature 403 K, CB 5 wt%, O2/BNOH (mol/mol) 0.76 and tube length 8 m. Under the optimal operating conditions, the conversion of BNOH and the selectivity of benzaldehyde were found to be 86.53% and 99.79%, respectively. In addition, the interfacial transport-reaction mechanism in Pickering emulsions under Taylor flow in microchannels was proposed from the perspective of multiphase mass transfer. This development provided significant insights and guiding for effectively performing multiphase catalytic reactions involving solid catalyst particles in microchannel reactors.
Text
CEJ-D-23-01388_Accepted
- Accepted Manuscript
More information
Accepted/In Press date: 27 April 2023
e-pub ahead of print date: 4 May 2023
Published date: 15 June 2023
Additional Information:
Funding Information:
We gratefully acknowledge the financial supports from National Natural Science Foundation of China (Nos. 21978250 , 22208278 ) and Natural Science Foundation of Shandong Province ( ZR2020KB013 , ZR2020QE211 , 2019KJC012 ).
Publisher Copyright:
© 2023 Elsevier B.V.
Keywords:
Mass transfer, Microchannel, Microreactor, Multiphase flow, Oxidation, Pickering emulsion
Identifiers
Local EPrints ID: 480739
URI: http://eprints.soton.ac.uk/id/eprint/480739
ISSN: 1385-8947
PURE UUID: a3ad1cb1-c995-46ad-b80a-2567068c6def
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Date deposited: 09 Aug 2023 16:50
Last modified: 27 Apr 2024 04:01
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Contributors
Author:
Hongye Li
Author:
Qingqiang Wang
Author:
Nan Jin
Author:
Haisheng Wei
Author:
Yuchao Zhao
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