Abstract
The design of synthetic inorganic catalysts mimicking the first coordination spheres of enzymatic cofactors often results in lower yields and selectivity than their biological counterparts. In this study, we exploit Kohn-Sham density functional methods to compare the reaction profiles of four single iron-based catalysts for the direct oxidation of methane to methanol: two biomimetic models based on two enzymes (cytochrome P450 and taurine dioxygenase [TauD]) and two synthetic reticular frameworks (iron-BEA zeolite and tri-iron oxo-center-based metal-organic framework). Both the biomimetic and inorganic catalysts show almost zero selectivity toward methanol for methane conversions >1% at ambient temperature. This study highlights that iron's first coordination shell can influence selectivity toward methanol but to a limited extent. In the absence of methanol protection strategies, high selectivity can be reached only by mimicking the reaction microenvironment of enzymes beyond the first coordination shell of iron.
Original language | English (US) |
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Article number | 101422 |
Journal | Cell Reports Physical Science |
Volume | 4 |
Issue number | 6 |
DOIs | |
State | Published - Jun 21 2023 |
Bibliographical note
Funding Information:This work was partially supported by the Inorganometallic Catalyst Design Center; an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences, under award no. DE-SC0012702; and by the Catalyst Design for Decarbonization Center, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences, under award no. DE-SC0023383. The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing computational resources. Conceptualization, J.G.V.; methodology, J.G.V.; investigation, J.G.V.; writing – original draft, J.G.V.; writing – review & editing, J.G.V. C.C.L. A.B. and L.G.; funding acquisition, L.G.; supervision, J.G.V. The authors declare no competing interests. We support inclusive, diverse, and equitable conduct of research.
Funding Information:
This work was partially supported by the Inorganometallic Catalyst Design Center ; an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences , under award no. DE-SC0012702 ; and by the Catalyst Design for Decarbonization Center , an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences , under award no. DE-SC0023383 . The authors acknowledge the Minnesota Supercomputing Institute (MSI) at the University of Minnesota for providing computational resources.
Publisher Copyright:
© 2023 The Author(s)
Keywords
- C–H bond activation
- MOFs
- P450
- TauD
- catalysis
- density functional theory
- enzymes
- methane-to-methanol
- selectivity
- zeolites