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Title: Speciation and Reactivity Control of Cu-Oxo Clusters via Extraframework Al in Mordenite for Methane Oxidation

Abstract

The stoichiometric conversion of methane to methanol by Cu-exchanged zeolites can be brought to highest yields by the presence of extraframework Al and high CH4 chemical potentials. Here, combining theory and experiments, the differences in chemical reactivity of monometallic Cu-oxo and bimetallic Cu-Al-oxo nanoclusters stabilized in zeolite mordenite (MOR) are investigated. Cu-L3 edge X-ray absorption near-edge structure (XANES), infrared (IR), and ultraviolet–visible (UV–vis) spectroscopies, in combination with CH4 oxidation activity tests, support the presence of two types of active clusters in MOR and allow quantification of the relative proportions of each type in dependence of the Cu concentration. Ab initio molecular dynamics (MD) calculations and thermodynamic analyses indicate that the superior performance of materials enriched in Cu-Al-oxo clusters is related to the activity of two μ-oxo bridges in the cluster. Replacing H2O with ethanol in the product extraction step led to the formation of ethyl methyl ether, expanding this way the applicability of these materials for the activation and functionalization of CH4. We show that competition between different ion-exchanged metal-oxo structures during the synthesis of Cu-exchanged zeolites determines the formation of active species, and this provides guidelines for the synthesis of highly active materials for CH4 activation and functionalization.

Authors:
 [1];  [2];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [5]
  1. Technische Univ. München, Garching (Germany)
  2. Delft Univ. of Technology (Netherlands)
  3. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  4. Technische Univ. München, Garching (Germany); Technische Univ. Wien (Austria)
  5. Technische Univ. München, Garching (Germany); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
OSTI Identifier:
2217136
Report Number(s):
PNNL-SA-179091
Journal ID: ISSN 0002-7863
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 145; Journal Issue: 32; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; cluster chemistry; hydrocarbons; materials; mathematical methods; metal clusters

Citation Formats

Tao, Lei, Khramenkova, Elena, Lee, Insu, Ikuno, Takaaki, Khare, Rachit, Jentys, Andreas, Fulton, John L., Kolganov, Alexander A., Pidko, Evgeny A., Sanchez-Sanchez, Maricruz, and Lercher, Johannes A. Speciation and Reactivity Control of Cu-Oxo Clusters via Extraframework Al in Mordenite for Methane Oxidation. United States: N. p., 2023. Web. doi:10.1021/jacs.3c04328.
Tao, Lei, Khramenkova, Elena, Lee, Insu, Ikuno, Takaaki, Khare, Rachit, Jentys, Andreas, Fulton, John L., Kolganov, Alexander A., Pidko, Evgeny A., Sanchez-Sanchez, Maricruz, & Lercher, Johannes A. Speciation and Reactivity Control of Cu-Oxo Clusters via Extraframework Al in Mordenite for Methane Oxidation. United States. https://doi.org/10.1021/jacs.3c04328
Tao, Lei, Khramenkova, Elena, Lee, Insu, Ikuno, Takaaki, Khare, Rachit, Jentys, Andreas, Fulton, John L., Kolganov, Alexander A., Pidko, Evgeny A., Sanchez-Sanchez, Maricruz, and Lercher, Johannes A. Mon . "Speciation and Reactivity Control of Cu-Oxo Clusters via Extraframework Al in Mordenite for Methane Oxidation". United States. https://doi.org/10.1021/jacs.3c04328.
@article{osti_2217136,
title = {Speciation and Reactivity Control of Cu-Oxo Clusters via Extraframework Al in Mordenite for Methane Oxidation},
author = {Tao, Lei and Khramenkova, Elena and Lee, Insu and Ikuno, Takaaki and Khare, Rachit and Jentys, Andreas and Fulton, John L. and Kolganov, Alexander A. and Pidko, Evgeny A. and Sanchez-Sanchez, Maricruz and Lercher, Johannes A.},
abstractNote = {The stoichiometric conversion of methane to methanol by Cu-exchanged zeolites can be brought to highest yields by the presence of extraframework Al and high CH4 chemical potentials. Here, combining theory and experiments, the differences in chemical reactivity of monometallic Cu-oxo and bimetallic Cu-Al-oxo nanoclusters stabilized in zeolite mordenite (MOR) are investigated. Cu-L3 edge X-ray absorption near-edge structure (XANES), infrared (IR), and ultraviolet–visible (UV–vis) spectroscopies, in combination with CH4 oxidation activity tests, support the presence of two types of active clusters in MOR and allow quantification of the relative proportions of each type in dependence of the Cu concentration. Ab initio molecular dynamics (MD) calculations and thermodynamic analyses indicate that the superior performance of materials enriched in Cu-Al-oxo clusters is related to the activity of two μ-oxo bridges in the cluster. Replacing H2O with ethanol in the product extraction step led to the formation of ethyl methyl ether, expanding this way the applicability of these materials for the activation and functionalization of CH4. We show that competition between different ion-exchanged metal-oxo structures during the synthesis of Cu-exchanged zeolites determines the formation of active species, and this provides guidelines for the synthesis of highly active materials for CH4 activation and functionalization.},
doi = {10.1021/jacs.3c04328},
journal = {Journal of the American Chemical Society},
number = 32,
volume = 145,
place = {United States},
year = {Mon Aug 07 00:00:00 EDT 2023},
month = {Mon Aug 07 00:00:00 EDT 2023}
}

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