The Role of Co-ZSM-5 Catalysts in Aerobic Oxidation of Ethylbenzene

Anyang Peng; Mayfair Kung; Matthew O. Ross; Brian M. Hoffman; Harold H. Kung

doi:10.1007/s11244-020-01305-z

The Role of Co-ZSM-5 Catalysts in Aerobic Oxidation of Ethylbenzene

Anyang Peng, Mayfair Kung^*, Matthew O. Ross, Brian M. Hoffman, Harold H. Kung^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Various forms of cobalt catalysts have been studied extensively for selective aerobic oxidation of hydrocarbons. However, it remains unclear whether cobalt can directly activate molecular oxygen under mild reaction conditions. Here we investigated the catalytic roles of cobalt in ethylbenzene oxidation with and without a hydroperoxide initiator. The contribution of different cobalt species was studied by varying the metal loading on Co-impregnated ZSM-5 samples. Quantitative EPR was used to determine the impact of cobalt catalysts on the free radical concentrations. This work provided strong evidence that cobalt, in several different forms, catalyzes hydrocarbon oxidation by facilitating peroxy bond cleavage, instead of direct oxygen activation.

Original language	English (US)
Pages (from-to)	1708-1716
Number of pages	9
Journal	Topics in Catalysis
Volume	63
Issue number	19-20
DOIs	https://doi.org/10.1007/s11244-020-01305-z
State	Published - Dec 2020

Funding

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DOE DE-FG02-03-ER15457. Collection and interpretation of EPR data was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Grant DE-SC0019342. This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DOE DE-FG02-03-ER15457. Collection and interpretation of EPR data was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Grant DE-SC0019342.

Keywords

Cobalt
Ethylbenzene
Hydroperoxide
Oxidation
ZSM-5

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1007/s11244-020-01305-z

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abstract = "Various forms of cobalt catalysts have been studied extensively for selective aerobic oxidation of hydrocarbons. However, it remains unclear whether cobalt can directly activate molecular oxygen under mild reaction conditions. Here we investigated the catalytic roles of cobalt in ethylbenzene oxidation with and without a hydroperoxide initiator. The contribution of different cobalt species was studied by varying the metal loading on Co-impregnated ZSM-5 samples. Quantitative EPR was used to determine the impact of cobalt catalysts on the free radical concentrations. This work provided strong evidence that cobalt, in several different forms, catalyzes hydrocarbon oxidation by facilitating peroxy bond cleavage, instead of direct oxygen activation.",

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AU - Ross, Matthew O.

AU - Hoffman, Brian M.

AU - Kung, Harold H.

PY - 2020/12

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N2 - Various forms of cobalt catalysts have been studied extensively for selective aerobic oxidation of hydrocarbons. However, it remains unclear whether cobalt can directly activate molecular oxygen under mild reaction conditions. Here we investigated the catalytic roles of cobalt in ethylbenzene oxidation with and without a hydroperoxide initiator. The contribution of different cobalt species was studied by varying the metal loading on Co-impregnated ZSM-5 samples. Quantitative EPR was used to determine the impact of cobalt catalysts on the free radical concentrations. This work provided strong evidence that cobalt, in several different forms, catalyzes hydrocarbon oxidation by facilitating peroxy bond cleavage, instead of direct oxygen activation.

AB - Various forms of cobalt catalysts have been studied extensively for selective aerobic oxidation of hydrocarbons. However, it remains unclear whether cobalt can directly activate molecular oxygen under mild reaction conditions. Here we investigated the catalytic roles of cobalt in ethylbenzene oxidation with and without a hydroperoxide initiator. The contribution of different cobalt species was studied by varying the metal loading on Co-impregnated ZSM-5 samples. Quantitative EPR was used to determine the impact of cobalt catalysts on the free radical concentrations. This work provided strong evidence that cobalt, in several different forms, catalyzes hydrocarbon oxidation by facilitating peroxy bond cleavage, instead of direct oxygen activation.

KW - Cobalt

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KW - Hydroperoxide

KW - Oxidation

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The Role of Co-ZSM-5 Catalysts in Aerobic Oxidation of Ethylbenzene

Abstract

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Keywords

ASJC Scopus subject areas

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