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Title: Electrons to Reactors Multiscale Modeling: Catalytic CO Oxidation over RuO2

Abstract

First-principles kinetic Monte Carlo (1p-kMC) simulations for CO oxidation on two RuO2 facets, RuO2(110) and RuO2(111), were coupled to the computational fluid dynamics (CFD) simulations package MFIX, and reactor-scale simulations were then performed. 1p-kMC coupled with CFD has recently been shown as a feasible method for translating molecular scale mechanistic knowledge to the reactor scale, enabling comparisons to in situ and online experimental measurements. Only a few studies with such coupling have been published. This work incorporates multiple catalytic surface facets into the scale-coupled simulation, and three possibilities were investigated: the two possibilities of each facet individually being the dominant phase in the reactor, and also the possibility that both facets were present on the catalyst particles in the ratio predicted by an ab initio thermodynamics-based Wulff construction. When lateral interactions between adsorbates were included in the 1p-kMC simulations, the two surfaces, RuO2(110) and RuO2(111), were found to be of similar order-of-magnitude in activity for the pressure range of 1 × 10–4 bar to 1 bar, with the RuO2(110) surface-termination showing more simulated activity than the RuO2(111) surface-termination. Coupling between the 1p-kMC and CFD was achieved with a lookup table generated by the error-based modified Shepard interpolation scheme. Isothermal reactormore » scale simulations were performed and compared to two separate experimental studies, conducted with reactant partial pressures of ≤0.1 bar. Simulations without an isothermality restriction were also conducted and showed that the simulated temperature gradient across the catalytic reactor bed is <0.5 K, which validated the use of the isothermality restriction for investigating the reactor-scale phenomenological temperature dependences. The approach with the Wulff construction based reactor simulations reproduced a trend similar to one experimental data set relatively well, with the (110) surface being more active at higher temperaures; in contrast, for the other experimental data set, our reactor simulations achieve surprisingly and perhaps fortuitously good agreement with the activity and phenomenological pressure dependence when it is assumed that the (111) facet is the only active facet present. Lastly, the active phase of catalytic CO oxidation over RuO2 remains unsettled, but the present study presents proof of principle (and progress) toward more accurate multiscale modeling from electrons to reactors and new simulation results.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [1]
+ Show Author Affiliations
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Technische Univ. Munchen, Garching (Germany)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Fiat Chrysler Automobiles, Auburn Hills, MI (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); SABIC, Houston, TX (United States)
  5. Free Univ., Berlin (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1436956
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
ACS Catalysis
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2155-5435
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; computational fluid dynamics; interpolation; kinetic Monte Carlo; kmos; mfix; multiscale; ruthenium; ruthenium oxide

Citation Formats

Sutton, Jonathan E., Lorenzi, Juan M., Krogel, Jaron T., Xiong, Qingang, Pannala, Sreekanth, Matera, Sebastian, and Savara, Aditya. Electrons to Reactors Multiscale Modeling: Catalytic CO Oxidation over RuO2. United States: N. p., 2018. Web. doi:10.1021/acscatal.8b00713.
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Sutton, Jonathan E., Lorenzi, Juan M., Krogel, Jaron T., Xiong, Qingang, Pannala, Sreekanth, Matera, Sebastian, & Savara, Aditya. Electrons to Reactors Multiscale Modeling: Catalytic CO Oxidation over RuO2. United States. https://doi.org/10.1021/acscatal.8b00713
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Sutton, Jonathan E., Lorenzi, Juan M., Krogel, Jaron T., Xiong, Qingang, Pannala, Sreekanth, Matera, Sebastian, and Savara, Aditya. Fri . "Electrons to Reactors Multiscale Modeling: Catalytic CO Oxidation over RuO2". United States. https://doi.org/10.1021/acscatal.8b00713. https://www.osti.gov/servlets/purl/1436956.
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@article{osti_1436956,
title = {Electrons to Reactors Multiscale Modeling: Catalytic CO Oxidation over RuO2},
author = {Sutton, Jonathan E. and Lorenzi, Juan M. and Krogel, Jaron T. and Xiong, Qingang and Pannala, Sreekanth and Matera, Sebastian and Savara, Aditya},
abstractNote = {First-principles kinetic Monte Carlo (1p-kMC) simulations for CO oxidation on two RuO2 facets, RuO2(110) and RuO2(111), were coupled to the computational fluid dynamics (CFD) simulations package MFIX, and reactor-scale simulations were then performed. 1p-kMC coupled with CFD has recently been shown as a feasible method for translating molecular scale mechanistic knowledge to the reactor scale, enabling comparisons to in situ and online experimental measurements. Only a few studies with such coupling have been published. This work incorporates multiple catalytic surface facets into the scale-coupled simulation, and three possibilities were investigated: the two possibilities of each facet individually being the dominant phase in the reactor, and also the possibility that both facets were present on the catalyst particles in the ratio predicted by an ab initio thermodynamics-based Wulff construction. When lateral interactions between adsorbates were included in the 1p-kMC simulations, the two surfaces, RuO2(110) and RuO2(111), were found to be of similar order-of-magnitude in activity for the pressure range of 1 × 10–4 bar to 1 bar, with the RuO2(110) surface-termination showing more simulated activity than the RuO2(111) surface-termination. Coupling between the 1p-kMC and CFD was achieved with a lookup table generated by the error-based modified Shepard interpolation scheme. Isothermal reactor scale simulations were performed and compared to two separate experimental studies, conducted with reactant partial pressures of ≤0.1 bar. Simulations without an isothermality restriction were also conducted and showed that the simulated temperature gradient across the catalytic reactor bed is <0.5 K, which validated the use of the isothermality restriction for investigating the reactor-scale phenomenological temperature dependences. The approach with the Wulff construction based reactor simulations reproduced a trend similar to one experimental data set relatively well, with the (110) surface being more active at higher temperaures; in contrast, for the other experimental data set, our reactor simulations achieve surprisingly and perhaps fortuitously good agreement with the activity and phenomenological pressure dependence when it is assumed that the (111) facet is the only active facet present. Lastly, the active phase of catalytic CO oxidation over RuO2 remains unsettled, but the present study presents proof of principle (and progress) toward more accurate multiscale modeling from electrons to reactors and new simulation results.},
doi = {10.1021/acscatal.8b00713},
journal = {ACS Catalysis},
number = ,
volume = 8,
place = {United States},
year = {Fri Apr 20 00:00:00 EDT 2018},
month = {Fri Apr 20 00:00:00 EDT 2018}
}
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https://doi.org/10.1021/acscatal.8b00713
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