期刊
CHEMICAL ENGINEERING SCIENCE
卷 245, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2021.116847
关键词
Benzyl alcohol; Oxidation; Membrane microchannel reactor; Mechanism; Kinetics; Cobalt porphyrins
资金
- National Key Research and Development Program of China [2020YFA0210900]
- National Natural Science Foundation of China [21938001, 21878344, 21961160741]
- National Natural Science Foundation of China-SINOPEC Joint Fund [U1663220]
- Guangdong Provincial Key RD Programme [2019B110206002]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01C102]
- Research and Innovation Team Construction Project of Guangdong University of Petrochemical Technology [2019rc049]
- Science and Technology Project of Huizhou [2017X0103003, 2017G0516063]
In a membrane microchannel reactor, the selective aerobic oxidation of benzyl alcohol to benzaldehyde catalyzed by cobalt porphyrin achieved high efficiency, with a conversion and benzaldehyde selectivity of 82% and 98% in 6.5 min. Kinetic studies revealed that the oxidation follows Michaelis-Menten kinetics, with a proposed mathematic kinetic model that fits well with experimental data and can predict reaction processes at various benzyl alcohol concentrations, aiding in process optimization and reactor design.
The highly efficient selective aerobic oxidation of benzyl alcohol to benzaldehyde catalyzed by cobalt porphyrin was achieved in a membrane microchannel reactor. The efficiency of benzyl alcohol oxidation was remarkably improved in the micro-structured chemical system, achieving a conversion and benzaldehyde selectivity of 82% and 98%, respectively, in 6.5 min. The classification and transfer of free radicals, as well as the oxygen-transfer mechanism, were determined by in situ EPR (electron paramagnetic resonance) and in situ UV-visible spectroscopy. Further kinetic studies revealed that the oxidation of benzyl alcohol follows the Michaelis-Menten kinetics, with K-m = 0.133 mol/L.A mathematic kinetic model was proposed, and the kinetic model fitted the experimental data well. The mathematical model can predict the reaction process at a wide range of benzyl alcohol concentrations, which is beneficial for the process optimization and reactor design. (C) 2021 Elsevier Ltd. All rights reserved.
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