Electronic Structure of the [Cu3 (μ-O) 3]2+ Cluster in Mordenite Zeolite and Its Effects on the Methane to Methanol Oxidation

Vogiatzis, Konstantinos D.; Li, Guanna; Hensen, Emiel J.  M.; Gagliardi, Laura; Pidko, Evgeny A.

doi:10.1021/acs.jpcc.7b08714

Title: Electronic Structure of the [Cu₃ (μ-O) ₃]²⁺ Cluster in Mordenite Zeolite and Its Effects on the Methane to Methanol Oxidation

Journal Article · Thu Sep 28 00:00:00 EDT 2017 · Journal of Physical Chemistry. C

DOI: https://doi.org/10.1021/acs.jpcc.7b08714 · OSTI ID:1421787

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Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry; University of Tennessee
Eindhoven Univ. of Technology (Netherlands); Delft Univ. of Technology (Netherlands)
Eindhoven Univ. of Technology (Netherlands)
Univ. of Minnesota, Minneapolis, MN (United States)
Eindhoven Univ. of Technology (Netherlands); ITMO Univ., St. Petersburg (Russia)

Identifying Cu-exchanged zeolites able to activate C–H bonds and selectively convert methane to methanol is a challenge in the field of biomimetic heterogeneous catalysis. Recent experiments point to the importance of trinuclear [Cu₃(μ-O)₃]²⁺ complexes inside the micropores of mordenite (MOR) zeolite for selective oxo-functionalization of methane. The electronic structures of these species, namely, the oxidation state of Cu ions and the reactive character of the oxygen centers, are not yet fully understood. In this study, we performed a detailed analysis of the electronic structure of the [Cu₃(μ-O)₃]²⁺ site using multiconfigurational wave-function-based methods and density functional theory. The calculations reveal that all Cu sites in the cluster are predominantly present in the Cu(II) formal oxidation state with a minor contribution from Cu(III), whereas two out of three oxygen anions possess a radical character. These electronic properties, along with the high accessibility of the out-of-plane oxygen center, make this oxygen the preferred site for the homolytic C–H activation of methane by [Cu₃(μ-O)₃]²⁺. These new insights aid in the construction of a theoretical framework for the design of novel catalysts for oxyfunctionalization of natural gas and suggest further spectroscopic examination.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research Center for Inorganometallic Catalyst Design (ICDC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012702

OSTI ID:: 1421787

Journal Information:: Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 40 Vol. 121; ISSN 1932-7447

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Rationally designing mixed Cu–(μ-O)–M (M = Cu, Ag, Zn, Au) centers over zeolite materials with high catalytic activity towards methane activation Wang, Guiru; Huang, Ling; Chen, Wei Physical Chemistry Chemical Physics, Vol. 20, Issue 41 https://doi.org/10.1039/c8cp04872j	journal	January 2018
DFT exploration of active site motifs in methane hydroxylation by Ni-ZSM-5 zeolite Mahyuddin, Muhammad Haris; Yoshizawa, Kazunari Catalysis Science & Technology, Vol. 8, Issue 22 https://doi.org/10.1039/c8cy01441h	journal	January 2018
Methane selective oxidation to methanol by metal-exchanged zeolites: a review of active sites and their reactivity Mahyuddin, Muhammad Haris; Shiota, Yoshihito; Yoshizawa, Kazunari Catalysis Science & Technology, Vol. 9, Issue 8 https://doi.org/10.1039/c8cy02414f	journal	January 2019

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Title: Electronic Structure of the [Cu₃ (μ-O) ₃]²⁺ Cluster in Mordenite Zeolite and Its Effects on the Methane to Methanol Oxidation