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Selective activation of methane C–H bond in the presence of methanol

Journal Article · · Journal of Catalysis

Direct methane to methanol (MTM) conversion over heterogeneous catalysts is a promising route for valorization of methane. The methane C-H bond activation is considered as the key step of the MTM and is the focus of considerable research activity. However, the formed methanol typically suffers from overoxidation largely due to the cleavage of a methanol C-H bond, whose bond dissociation energy is ca. 0.5 eV lower than that of the methane C-H bond, which usually translates to a transition state energy of the methanol C-H bond cleavage that is ca. 0.55 eV lower than that of methane whenever the reactions proceed through a radical mechanism. Furthermore, we propose a general approach for decreasing the transition state energy difference between the CH4 and CH3OH C-H bond dissociation. When a metal-oxide supported cationic transition metal atom and a neighboring oxygen on the oxide surface serve as the active site, the transition state energy difference through a surface-stabilized pathway can be noticeably narrowed as compared with that of a radical pathway. For Ir, Pt and Rh-doped anatase TiO2(101), the CH4 C-H bond activation can be preferred over that of CH3OH at significant methanol mole fraction. Also, for PdAu alloys containing adsorbed oxygen and positively charged Pd, calculations suggest in agreement with recent experiments (Science 367 (6474), 193-197) that the CH4 C-H bond can be selectively activated in the presence of CH3OH.

Research Organization:
University of South Carolina, Columbia, SC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0007167; AC02-05CH11231
OSTI ID:
3001233
Alternate ID(s):
OSTI ID: 1615176
OSTI ID: 1656892
Journal Information:
Journal of Catalysis, Journal Name: Journal of Catalysis Vol. 386; ISSN 0021-9517
Publisher:
Elsevier BVCopyright Statement
Country of Publication:
United States
Language:
English

References (36)

Optimal Water Coverage on Alumina: A Key to Generate Lewis Acid-Base Pairs that are Reactive Towards the CH Bond Activation of Methane journal February 2011
The Direct Catalytic Oxidation of Methane to Methanol-A Critical Assessment journal November 2017
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
A fast and robust algorithm for Bader decomposition of charge density journal June 2006
Stability and reactivity of copper oxo-clusters in ZSM-5 zeolite for selective methane oxidation to methanol journal June 2016
Modeling chemical reactions on surfaces: The roles of chemical bonding and van der Waals interactions journal December 2019
Density functional theory studies of the structure and electronic structure of pure and defective low index surfaces of ceria journal February 2005
Direct Conversion of Methane to Methanol under Mild Conditions over Cu-Zeolites and beyond journal January 2017
Theoretical Investigations of Pt 1 @CeO 2 Single-Atom Catalyst for CO Oxidation journal May 2017
Direct Methane to Methanol: The Selectivity–Conversion Limit and Design Strategies journal June 2018
Direct Oxidation of Methane to Methanol Enabled by Electronic Atomic Monolayer–Metal Support Interaction journal May 2019
Catalytic Oxidation of Methane into Methanol over Copper-Exchanged Zeolites with Oxygen at Low Temperature journal April 2016
Mild oxidation of methane to methanol or acetic acid on supported isolated rhodium catalysts journal November 2017
Creating single-atom Pt-ceria catalysts by surface step decoration journal February 2016
Metal/oxide interfacial effects on the selective oxidation of primary alcohols journal January 2017
Single-site trinuclear copper oxygen clusters in mordenite for selective conversion of methane to methanol journal June 2015
Understanding trends in C–H bond activation in heterogeneous catalysis journal October 2016
Single rhodium atoms anchored in micropores for efficient transformation of methane under mild conditions journal March 2018
Reversible and cooperative photoactivation of single-atom Cu/TiO2 photocatalysts journal April 2019
Heterogeneous single-atom catalysis journal May 2018
Misconceptions and challenges in methane-to-methanol over transition-metal-exchanged zeolites journal May 2019
Mechanistic insights into heterogeneous methane activation journal January 2017
Hydrogen interaction with the anatase TiO2(101) surface journal January 2012
A climbing image nudged elastic band method for finding saddle points and minimum energy paths journal December 2000
Efficient methods for finding transition states in chemical reactions: Comparison of improved dimer method and partitioned rational function optimization method journal December 2005
A consistent and accurate ab initio parametrization of density functional dispersion correction (DFT-D) for the 94 elements H-Pu journal April 2010
A dimer method for finding saddle points on high dimensional potential surfaces using only first derivatives journal October 1999
Special points for Brillouin-zone integrations journal June 1976
Projector augmented-wave method journal December 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Tkatchenko-Scheffler van der Waals correction method with and without self-consistent screening applied to solids journal February 2013
Generalized Gradient Approximation Made Simple journal October 1996
Interface-Confined Ferrous Centers for Catalytic Oxidation journal May 2010
Activation of surface lattice oxygen in single-atom Pt/CeO 2 for low-temperature CO oxidation journal December 2017
Hydrophobic zeolite modification for in situ peroxide formation in methane oxidation to methanol journal January 2020