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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

Journal Article · · Journal of Physical Chemistry. C

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.

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)
Grant/Contract Number:
SC0012702
OSTI ID:
1421787
Alternate ID(s):
OSTI ID: 1507574
Journal Information:
Journal of Physical Chemistry. C, Vol. 121, Issue 40; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

References (75)

Postextraction Separation, On-Board Storage, and Catalytic Conversion of Methane in Natural Gas: A Review journal August 2016
Halogen-Mediated Conversion of Hydrocarbons to Commodities journal February 2017
Strategies for the Direct Catalytic Valorization of Methane Using Heterogeneous Catalysis: Challenges and Opportunities journal April 2016
The active site of low-temperature methane hydroxylation in iron-containing zeolites journal August 2016
Beyond Oil and Gas: The Methanol Economy journal April 2005
Recent advances in heterogeneous selective oxidation catalysis for sustainable chemistry journal January 2014
Copper Active Sites in Biology journal January 2014
Crystal structure of a bacterial non-haem iron hydroxylase that catalyses the biological oxidation of methane journal December 1993
Crystal structure of a membrane-bound metalloenzyme that catalyses the biological oxidation of methane journal January 2005
Oxidation of methane by a biological dicopper centre journal April 2010
One is Lonely and Three is a Crowd: Two Coppers Are for Methane Oxidation journal July 2010
Toward Delineating the Structure and Function of the Particulate Methane Monooxygenase from Methanotrophic Bacteria journal April 2004
Redox Potentiometry Studies of Particulate Methane Monooxygenase: Support for a Trinuclear Copper Cluster Active Site journal March 2007
Efficient Room-Temperature Oxidation of Hydrocarbons Mediated by Tricopper Cluster Complexes with Different Ligands journal November 2012
Cu based zeolites: A UV–vis study of the active site in the selective methane oxidation at low temperatures journal December 2005
Selective Oxidation of Methane by the Bis(μ-oxo)dicopper Core Stabilized on ZSM-5 and Mordenite Zeolites journal February 2005
Cu-ZSM-5: A biomimetic inorganic model for methane oxidation journal December 2011
Catalytic conversion of methane to methanol over Cu–mordenite journal January 2012
Determination of the electronic and geometric structure of Cu sites during methane conversion over Cu-MOR with X-ray absorption spectroscopy journal January 2013
Spectroscopy and Redox Chemistry of Copper in Mordenite journal January 2014
Single-site trinuclear copper oxygen clusters in mordenite for selective conversion of methane to methanol journal June 2015
Catalytic Oxidation of Methane into Methanol over Copper-Exchanged Zeolites with Oxygen at Low Temperature journal April 2016
Solid-State Ion-Exchanged Cu/Mordenite Catalysts for the Direct Conversion of Methane to Methanol journal January 2017
Direct Conversion of Methane to Methanol under Mild Conditions over Cu-Zeolites and beyond journal January 2017
Understanding trends in C–H bond activation in heterogeneous catalysis journal October 2016
Bis(μ-oxo)dicopper in Cu-ZSM-5 and Its Role in the Decomposition of NO:  A Combined in Situ XAFS, UV−Vis−Near-IR, and Kinetic Study
  • Groothaert, Marijke H.; van Bokhoven, Jeroen A.; Battiston, Andrea A.
  • Journal of the American Chemical Society, Vol. 125, Issue 25 https://doi.org/10.1021/ja029684w
journal June 2003
Identification of Cu(ii) coordination structures in Cu-ZSM-5, based on a DFT/ab initio assignment of the EPR spectra journal January 2003
Cu-ZSM-5 Zeolites for the Formation of Methanol from Methane and Oxygen: Probing the Active Sites and Spectator Species journal June 2010
Coordination chemistry and reactivity of copper in zeolites journal January 2013
Spectroscopic Definition of the Copper Active Sites in Mordenite: Selective Methane Oxidation journal May 2015
Possibility of Copper-Ion-Exchanged MFI-Type Zeolite as C–H Bond Activation Material for Propane and the Driving Force for Activation journal September 2015
Existence of dual species composed of Cu+ in CuMFI being bridged by C2H2 journal January 2010
Reaction Conditions of Methane-to-Methanol Conversion Affect the Structure of Active Copper Sites journal December 2013
Direct Catalytic Conversion of Methane to Methanol in an Aqueous Medium by using Copper-Promoted Fe-ZSM-5 journal April 2012
A [Cu 2 O] 2+ core in Cu-ZSM-5, the active site in the oxidation of methane to methanol journal October 2009
Formation of [Cu 2 O 2 ] 2+ and [Cu 2 O] 2+ toward C–H Bond Activation in Cu-SSZ-13 and Cu-SSZ-39 journal May 2017
Monocopper Active Site for Partial Methane Oxidation in Cu-Exchanged 8MR Zeolites journal September 2016
Roles of Zeolite Confinement and Cu–O–Cu Angle on the Direct Conversion of Methane to Methanol by [Cu 2 (μ-O)] 2+ -Exchanged AEI, CHA, AFX, and MFI Zeolites journal April 2017
Assessing the relative stability of copper oxide clusters as active sites of a CuMOR zeolite for methane to methanol conversion: size matters? journal January 2017
Synthesis of single-site copper catalysts for methane partial oxidation journal January 2016
Distinct activation of Cu-MOR for direct oxidation of methane to methanol journal January 2017
Facile O-atom insertion into CC and CH bonds by a trinuclear copper complex designed to harness a singlet oxene journal September 2007
Development of the Tricopper Cluster as a Catalyst for the Efficient Conversion of Methane into MeOH journal September 2013
Stability and reactivity of copper oxo-clusters in ZSM-5 zeolite for selective methane oxidation to methanol journal June 2016
High-level ab initio calculations on the energetics of low-lying spin states of biologically relevant transition metal complexes: a first progress report journal February 2003
A reinterpretation of the EPR spectra of Cu(II) in zeolites A, Y and ZK4, based on ab initio cluster model calculations journal January 2001
Computationally Exploring Confinement Effects in the Methane-to-Methanol Conversion Over Iron-Oxo Centers in Zeolites journal November 2016
Ab initio molecular dynamics for open-shell transition metals journal November 1993
Generalized Gradient Approximation Made Simple journal October 1996
Projector augmented-wave method journal December 1994
The monoclinic framework structure of zeolite H-ZSM-5. Comparison with the orthorhombic framework of as-synthesized ZSM-5 journal April 1990
Multinuclear gallium-oxide cations in high-silica zeolites journal January 2009
Structure−Reactivity Relationship for Catalytic Activity of Gallium Oxide and Sulfide Clusters in Zeolite journal February 2009
A climbing image nudged elastic band method for finding saddle points and minimum energy paths journal December 2000
Determinant based configuration interaction algorithms for complete and restricted configuration interaction spaces journal August 1988
The restricted active space self-consistent-field method, implemented with a split graph unitary group approach journal July 1990
Second‐order perturbation theory with a complete active space self‐consistent field reference function journal January 1992
The restricted active space followed by second-order perturbation theory method: Theory and application to the study of CuO2 and Cu2O2 systems journal May 2008
Main Group Atoms and Dimers Studied with a New Relativistic ANO Basis Set December 2003
New Relativistic ANO Basis Sets for Transition Metal Atoms journal July 2005
Quantum electrodynamical corrections to the fine structure of helium journal January 1974
Relativistic electronic-structure calculations employing a two-component no-pair formalism with external-field projection operators journal June 1986
A modified definition of the zeroth-order Hamiltonian in multiconfigurational perturbation theory (CASPT2) journal September 2004
Multiconfiguration perturbation theory with imaginary level shift journal August 1997
Unbiased auxiliary basis sets for accurate two-electron integral approximations journal September 2007
Molcas 8: New capabilities for multiconfigurational quantum chemical calculations across the periodic table : Molcas 8 journal November 2015
Density-functional exchange-energy approximation with correct asymptotic behavior journal September 1988
Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density journal January 1988
Is [FeO] 2+ the Active Center Also in Iron Containing Zeolites? A Density Functional Theory Study of Methane Hydroxylation Catalysis by Fe-ZSM-5 Zeolite journal April 2010
Ligand Field Effects and the High Spin–High Reactivity Correlation in the H Abstraction by Non-Heme Iron(IV)–Oxo Complexes: A DFT Frontier Orbital Perspective journal February 2015
Mechanism of Oxidation of Ethane to Ethanol at Iron(IV)–Oxo Sites in Magnesium-Diluted Fe 2 (dobdc) journal April 2015
Selective anaerobic oxidation of methane enables direct synthesis of methanol journal May 2017
Toward the Balance between the Reductionist and Systems Approaches in Computational Catalysis: Model versus Method Accuracy for the Description of Catalytic Systems journal May 2017
Carboxylate Binding in Copper Histidine Complexes in Solution and in Zeolite Y:  X- and W-band Pulsed EPR/ENDOR Combined with DFT Calculations journal August 2004
Study of propane oxidation on Cu-zeolite catalysts by in-situ EPR and IR spectroscopies journal May 2014

Cited By (13)

Copper-Exchanged Omega (MAZ) Zeolite: Copper-concentration Dependent Active Sites and its Unprecedented Methane to Methanol Conversion journal November 2018
Quantum Chemical Studies of Methane Oxidation to Methanol on a Biomimetic Tricopper Complex: Mechanistic Insights journal May 2018
Cu-Exchanged Ferrierite Zeolite for the Direct CH4 to CH3OH Conversion: Insights on Cu Speciation from X-Ray Absorption Spectroscopy journal March 2019
Rationally designing mixed Cu–(μ-O)–M (M = Cu, Ag, Zn, Au) centers over zeolite materials with high catalytic activity towards methane activation journal January 2018
Property–Activity Relations for Methane Activation by Dual‐Metal Cu–Oxo Trimers in ZSM‐5 Zeolite journal August 2018
Cation-exchanged zeolites for the selective oxidation of methane to methanol journal January 2018
On the Accuracy of Density Functional Theory in Zeolite Catalysis journal July 2019
Structural and bonding properties of Cu 3 O 3 and Cu 3 O 4 clusters: anion photoelectron spectroscopy and density functional calculations journal January 2018
Methane selective oxidation to methanol by metal-exchanged zeolites: a review of active sites and their reactivity journal January 2019
DFT exploration of active site motifs in methane hydroxylation by Ni-ZSM-5 zeolite journal January 2018
The Nature and Catalytic Function of Cation Sites in Zeolites: a Computational Perspective journal October 2018
Recent Progress in Direct Conversion of Methane to Methanol Over Copper-Exchanged Zeolites journal July 2019
Zeolites at the Molecular Level: What Can Be Learned from Molecular Modeling journal March 2021

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