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Title: Theoretical insights into the selective oxidation of methane to methanol in copper-exchanged mordenite

Journal Article · · ACS Catalysis
 [1];  [2];  [3];  [2];  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States); Tianjin Univ., Tianjin (People's Republic of China)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States); Univ. Autonoma de Barcelona, Barcelona (Spain)

Selective oxidation of methane to methanol is one of the most difficult chemical processes to perform. A potential group of catalysts to achieve CH4 partial oxidation are Cu-exchanged zeolites mimicking the active structure of the enzyme methane monooxygenase. However, the details of this conversion, including the structure of the active site, are still under debate. In this contribution, periodic density functional theory (DFT) methods were employed to explore the molecular features of the selective oxidation of methane to methanol catalyzed by Cu-exchanged mordenite (Cu-MOR). We focused on two types of previously suggested active species, CuOCu and CuOOCu. Our calculations indicate that the formation of CuOCu is more feasible than that of CuOOCu. In addition, a much lower C–H dissociation barrier is located on the former active site, indicating that C–H bond activation is easily achieved with CuOCu. We calculated the energy barriers of all elementary steps for the entire process, including catalyst activation, CH4 activation, and CH3OH desorption. Finally, our calculations are in agreement with experimental observations and present the first theoretical study examining the entire process of selective oxidation of methane to methanol.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1349409
Journal Information:
ACS Catalysis, Vol. 6, Issue 6; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 116 works
Citation information provided by
Web of Science

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Competition of C‐C bond formation and C‐H bond formation For acetylene hydrogenation on transition metals: A density functional theory study journal December 2018
The Direct Catalytic Oxidation of Methane to Methanol-A Critical Assessment journal November 2017
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
Misconceptions and challenges in methane-to-methanol over transition-metal-exchanged zeolites journal May 2019
Valorization of Eggshell Waste into Supported Copper Catalysts for Partial Oxidation of Methane journal November 2019
Assessment of mean-field microkinetic models for CO methanation on stepped metal surfaces using accelerated kinetic Monte Carlo journal October 2017
Methane selective oxidation to methanol by metal-exchanged zeolites: a review of active sites and their reactivity journal January 2019
Copper Affects the Location of Zinc in Bimetallic Ion-Exchanged Mordenite journal April 2018
Quasicatalytic and catalytic selective oxidation of methane to methanol over solid materials: a review on the roles of water journal October 2019
Direct conversion of methane to methanol with zeolites: towards understanding the role of extra-framework d-block metal and zeolite framework type journal January 2019
Cu-Exchanged Ferrierite Zeolite for the Direct CH4 to CH3OH Conversion: Insights on Cu Speciation from X-Ray Absorption Spectroscopy journal March 2019
Homogenous Meets Heterogenous and Electro‐Catalysis: Iron‐Nitrogen Molecular Complexes within Carbon Materials for Catalytic Applications journal June 2019
Methane-to-methanol conversion over zeolite Cu-SSZ-13, and its comparison with the selective catalytic reduction of NO x with NH 3 journal January 2018
On the role of Ce in CO 2 adsorption and activation over lanthanum species journal January 2018
Cation-exchanged zeolites for the selective oxidation of methane to methanol journal January 2018
Active sites and mechanism of the direct conversion of methane and carbon dioxide to acetic acid over the zinc-modified H-ZSM-5 zeolite journal January 2019
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
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