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Title: Boosting the activity of transition metal carbides towards methane activation by nanostructuring

Abstract

The interaction of methane with pristine surfaces of bulk MoC and Mo2C is known to be weak. In contrast, a series of X-ray photoelectron spectroscopy (XPS) experiments, combined with thermal desorption mass spectroscopy (TDS), for MoCy (y = 0.5–1.3) nanoparticles supported on Au(111)—which is completely inert towards CH4—show that these systems adsorb and dissociate CH4 at room temperature and low CH4 partial pressure. This industrially-relevant finding has been further investigated with accurate density functional theory (DFT) based calculations on a variety of MoCy supported model systems. The DFT calculations reveal that the MoCy/Au(111) systems can feature low C–H bond scission energy barriers, smaller than the CH4 adsorption energy. Our theoretical results for bulk surfaces of Mo2C and MoC show that a simple Brønsted–Evans–Polanyi (BEP) relationship holds for C–H bond scission on these systems. However, this is not the case for methane activation on the MoCy nanoparticles as a consequence of their unique electronic and chemical properties. Finally, the discovery that supported molybdenum carbide nanoparticles are able to activate methane at room temperature paves the road towards the design of a new family of active carbide catalysts for methane activation and valorisation, with important implications in climate change mitigation and carbonmore » cycle closure.« less

Authors:
 [1];  [2];  [1]; ORCiD logo [1];  [3]; ORCiD logo [1]; ORCiD logo [4]
  1. Univ. of Barcelona (Spain)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Central Univ. of Venezuela, Caracas (Venezuela)
  3. Central Univ. of Venezuela, Caracas (Venezuela)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1609096
Alternate Identifier(s):
OSTI ID: 1605958
Report Number(s):
BNL-213806-2020-JAAM
Journal ID: ISSN 1463-9076; PPCPFQ
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 22; Journal Issue: 13; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; methane; metal carbides; gold

Citation Formats

Figueras, Marc, Gutiérrez, Ramón A., Prats, Hector, Viñes, Francesc, Ramírez, Pedro J., Illas, Francesc, and Rodriguez, José A. Boosting the activity of transition metal carbides towards methane activation by nanostructuring. United States: N. p., 2020. Web. doi:10.1039/D0CP00228C.
Figueras, Marc, Gutiérrez, Ramón A., Prats, Hector, Viñes, Francesc, Ramírez, Pedro J., Illas, Francesc, & Rodriguez, José A. Boosting the activity of transition metal carbides towards methane activation by nanostructuring. United States. https://doi.org/10.1039/D0CP00228C
Figueras, Marc, Gutiérrez, Ramón A., Prats, Hector, Viñes, Francesc, Ramírez, Pedro J., Illas, Francesc, and Rodriguez, José A. Fri . "Boosting the activity of transition metal carbides towards methane activation by nanostructuring". United States. https://doi.org/10.1039/D0CP00228C. https://www.osti.gov/servlets/purl/1609096.
@article{osti_1609096,
title = {Boosting the activity of transition metal carbides towards methane activation by nanostructuring},
author = {Figueras, Marc and Gutiérrez, Ramón A. and Prats, Hector and Viñes, Francesc and Ramírez, Pedro J. and Illas, Francesc and Rodriguez, José A.},
abstractNote = {The interaction of methane with pristine surfaces of bulk MoC and Mo2C is known to be weak. In contrast, a series of X-ray photoelectron spectroscopy (XPS) experiments, combined with thermal desorption mass spectroscopy (TDS), for MoCy (y = 0.5–1.3) nanoparticles supported on Au(111)—which is completely inert towards CH4—show that these systems adsorb and dissociate CH4 at room temperature and low CH4 partial pressure. This industrially-relevant finding has been further investigated with accurate density functional theory (DFT) based calculations on a variety of MoCy supported model systems. The DFT calculations reveal that the MoCy/Au(111) systems can feature low C–H bond scission energy barriers, smaller than the CH4 adsorption energy. Our theoretical results for bulk surfaces of Mo2C and MoC show that a simple Brønsted–Evans–Polanyi (BEP) relationship holds for C–H bond scission on these systems. However, this is not the case for methane activation on the MoCy nanoparticles as a consequence of their unique electronic and chemical properties. Finally, the discovery that supported molybdenum carbide nanoparticles are able to activate methane at room temperature paves the road towards the design of a new family of active carbide catalysts for methane activation and valorisation, with important implications in climate change mitigation and carbon cycle closure.},
doi = {10.1039/D0CP00228C},
journal = {Physical Chemistry Chemical Physics. PCCP (Print)},
number = 13,
volume = 22,
place = {United States},
year = {Fri Mar 13 00:00:00 EDT 2020},
month = {Fri Mar 13 00:00:00 EDT 2020}
}

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