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Title: Size and Stoichiometry Effects on the Reactivity of MoCy Nanoparticles Towards Ethylene

Abstract

Molybdenum carbides are promising catalysts alternative to Pt-group metals for the hydrogenation of unsaturated hydrocarbons. Nanostructuring has been shown to be an efficient way to boost the catalytic activity of these materials with MoCy nanoparticles (NPs) exhibiting a good performance when encapsulated inside zeolites or dispersed on inert supports such as carbon or gold. In this work, we focus on a systematic DFT study of the interaction of MoCy NPs with ethylene (C2H4), as a general and simple approach for examining binding and activation of C≡C bonds. Models for 14 NPs, with a Mo/C ratio in the 0.67 to 2.00 range, have been built following a cascade procedure. Several chemical descriptors, including the adsorption energy, structural NPs distortion, C≡C deformation, and C2H4 attachment energy have been analyzed along with a meticulous geometric and electronic characterization of bare NPs and C2H4 binding. The present results show that 1:1 stoichiometric Mo6C6, Mo12C12, and Mo24C24, and the non-stochiometric Mo4C6, Mo8C12 (MetCar), and Mo14C13 (Nanocube) are excellent systems for the binding and activation of ethylene, exhibiting a much bigger reactivity than a bulk δ-MoC(001) surface with a similar Mo:C ratio. In addition, C2H4 binding on the NPs with a Mo/C < 1.08 is advantageousmore » since, apart from a rather large adsorption energy, implies low energy values for NPs deformation (from 0.00 to 0.31 eV), C≡C distortion (from 0.30 to 0.52 eV), and C2H4 attachment (from -2.12 to -2.58 eV). These theoretical results point to the ideal MoCy size and composition for C2H4 binding, providing a background for further experimental studies aimed at the preparation of MoCy NPs as hydrogenation catalysts.« less

Authors:
 [1];  [2];  [1];  [2]; ORCiD logo [3];  [2]
  1. Univ. de Medellin (Colombia)
  2. Univ. de Barcelona (Spain)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Generalitat de Catalunya
OSTI Identifier:
1767414
Report Number(s):
BNL-221076-2021-JAAM
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
SC0012704; RTI2018-095460-B-I00; MDM-2017-0767; 2017SGR13
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 125; Journal Issue: 11; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ethylene; molybdenum carbide

Citation Formats

Jimenez-Orozco, Carlos, Figueras, Marc, Florez, Elizabeth, Vines, Francesc, Rodriguez, Jose A., and Illas, Francesc. Size and Stoichiometry Effects on the Reactivity of MoCy Nanoparticles Towards Ethylene. United States: N. p., 2021. Web. doi:10.1021/acs.jpcc.0c10689.
Jimenez-Orozco, Carlos, Figueras, Marc, Florez, Elizabeth, Vines, Francesc, Rodriguez, Jose A., & Illas, Francesc. Size and Stoichiometry Effects on the Reactivity of MoCy Nanoparticles Towards Ethylene. United States. https://doi.org/10.1021/acs.jpcc.0c10689
Jimenez-Orozco, Carlos, Figueras, Marc, Florez, Elizabeth, Vines, Francesc, Rodriguez, Jose A., and Illas, Francesc. Wed . "Size and Stoichiometry Effects on the Reactivity of MoCy Nanoparticles Towards Ethylene". United States. https://doi.org/10.1021/acs.jpcc.0c10689. https://www.osti.gov/servlets/purl/1767414.
@article{osti_1767414,
title = {Size and Stoichiometry Effects on the Reactivity of MoCy Nanoparticles Towards Ethylene},
author = {Jimenez-Orozco, Carlos and Figueras, Marc and Florez, Elizabeth and Vines, Francesc and Rodriguez, Jose A. and Illas, Francesc},
abstractNote = {Molybdenum carbides are promising catalysts alternative to Pt-group metals for the hydrogenation of unsaturated hydrocarbons. Nanostructuring has been shown to be an efficient way to boost the catalytic activity of these materials with MoCy nanoparticles (NPs) exhibiting a good performance when encapsulated inside zeolites or dispersed on inert supports such as carbon or gold. In this work, we focus on a systematic DFT study of the interaction of MoCy NPs with ethylene (C2H4), as a general and simple approach for examining binding and activation of C≡C bonds. Models for 14 NPs, with a Mo/C ratio in the 0.67 to 2.00 range, have been built following a cascade procedure. Several chemical descriptors, including the adsorption energy, structural NPs distortion, C≡C deformation, and C2H4 attachment energy have been analyzed along with a meticulous geometric and electronic characterization of bare NPs and C2H4 binding. The present results show that 1:1 stoichiometric Mo6C6, Mo12C12, and Mo24C24, and the non-stochiometric Mo4C6, Mo8C12 (MetCar), and Mo14C13 (Nanocube) are excellent systems for the binding and activation of ethylene, exhibiting a much bigger reactivity than a bulk δ-MoC(001) surface with a similar Mo:C ratio. In addition, C2H4 binding on the NPs with a Mo/C < 1.08 is advantageous since, apart from a rather large adsorption energy, implies low energy values for NPs deformation (from 0.00 to 0.31 eV), C≡C distortion (from 0.30 to 0.52 eV), and C2H4 attachment (from -2.12 to -2.58 eV). These theoretical results point to the ideal MoCy size and composition for C2H4 binding, providing a background for further experimental studies aimed at the preparation of MoCy NPs as hydrogenation catalysts.},
doi = {10.1021/acs.jpcc.0c10689},
journal = {Journal of Physical Chemistry. C},
number = 11,
volume = 125,
place = {United States},
year = {Wed Mar 10 00:00:00 EST 2021},
month = {Wed Mar 10 00:00:00 EST 2021}
}

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