Efficient Transfer Hydrodehalogenation of Halophenols Catalyzed by Pd Supported on Ceria

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2022-12-19
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Naik, Pranjali
Kunal, Pranaw
Liu, Da-Jiang
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Iowa State University Digital Repository, Ames IA (United States)
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ChemistryAmes National LaboratoryPhysics and AstronomyMathematics
Abstract
The transfer hydrodehalogenation (THD) of halophenols is efficiently catalyzed by palladium supported on high surface ceria (Pd/CeO2) under mild conditions (65 °C) using isopropanol (iPrOH) as hydrogen source. The reactivity of 4-halophenols (4-X-PhOH) varies in the order 4-F-PhOH > 4-Cl-PhOH > 4-Br-PhOH >> 4-I-PhOH and appears to be controlled by the desorption of halides from the catalyst surface. Kinetic analysis of the reactions and temperature programmed surface reaction (TPSR) experiments indicate that oxidative addition of C-X bonds and H-abstraction from isopropoxide compete for the same active sites on Pd. The catalyst was able to conduct the THD of various hazardous pollutants and emerging contaminants (DDT, pentachlorophenol, pentafluorophenol and triclosan).
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This is a manuscript of an article published as Naik, Pranjali J., Pranaw Kunal, Da-Jiang Liu, James W. Evans, and Igor I. Slowing. "Efficient transfer hydrodehalogenation of halophenols catalyzed by Pd supported on ceria." Applied Catalysis A: General 650 (2023): 119007. DOI: 10.1016/j.apcata.2022.119007. Copyright 2022 Elsevier B.V. Posted with permission. DOE Contract Number(s): AC02-07CH11358
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