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Title: Kinetics study on heterogeneous catalytic wet air oxidation of phenol using copper/activated carbon catalyst
Authors: Wu, Qiang
Hu, Xijun
Yue, Po-Lock
Keywords: Wet air oxidation
Heterogeneous catalysis
Issue Date: 2005
Citation: International Journal of chemical Reactor Engineering, 2005, v. 3, Article A29
Abstract: Heterogeneous kinetics of catalytic wet air oxidation (CWAO) of phenol was studied using copper supported on activated carbon as the catalyst and oxygen as the oxidant. Both mass transfer effect and deactivation of catalyst can affect the kinetics measurement. To eliminate the mass transfer barriers, the study was conducted in a stirred tank batch reactor using catalysts of very small particle size. In order to prevent the catalyst deactivation caused by copper leaching from the support, saturated pH buffer solution was added into the reaction system and the initial phenol and catalyst concentrations were reduced. A mathematic model was proposed following the Langmuir-Hinshelwood mechanism to simulate the reaction kinetics. It is believed through simulation that the dissolved oxygen is adsorbed by the catalyst in molecular form which subsequently starts to degrade phenol on the catalyst surface. Both reaction rate constant and activation energy were determined for a temperature range of 140 - 160 ℃ and an oxygen partial pressure range of 0.4 - 1.6 MPa. The proposed mechanism and kinetic model were found to be in good agreement with experimental results.
Rights: Copyright © 2005 by authors. It is posted here by permission of the authors and The Berkeley Electronic Press for non-commercial use. Not for redistribution.
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