Quantifying the Impact of Parametric Uncertainty on Automatic Mechanism Generation for CO2 Hydrogenation on Ni(111)

Automatic mechanism generation is used to determine mechanisms for the CO2 hydrogenation on Ni(111) in a two-stage process while considering the correlated uncertainty in DFT-based energetic parameters systematically. In a coarse stage, all the possible chemistry is explored with gas-phase products...

Celý popis

Uloženo v:
Podrobná bibliografie
Vydáno v:JACS Au Ročník 1; číslo 10; s. 1656 - 1673
Hlavní autoři: Kreitz, Bjarne, Sargsyan, Khachik, Blöndal, Katrín, Mazeau, Emily J, West, Richard H, Wehinger, Gregor D, Turek, Thomas, Goldsmith, C. Franklin
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States American Chemical Society 25.10.2021
ACS Publications
Témata:
carbon dioxide
global uncertainty analysis
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
methanation
rate-based algorithm
RMG
carbon dioxide
methanation
global uncertainty analysis
RMG
rate-based algorithm
ISSN:2691-3704, 2691-3704
On-line přístup:Získat plný text
Tagy: Přidat tag
Žádné tagy, Buďte první, kdo vytvoří štítek k tomuto záznamu!
Popis
Shrnutí:Automatic mechanism generation is used to determine mechanisms for the CO2 hydrogenation on Ni(111) in a two-stage process while considering the correlated uncertainty in DFT-based energetic parameters systematically. In a coarse stage, all the possible chemistry is explored with gas-phase products down to the ppb level, while a refined stage discovers the core methanation submechanism. Five thousand unique mechanisms were generated, which contain minor perturbations in all parameters. Global uncertainty assessment, global sensitivity analysis, and degree of rate control analysis are performed to study the effect of this parametric uncertainty on the microkinetic model predictions. Comparison of the model predictions with experimental data on a Ni/SiO2 catalyst find a feasible set of microkinetic mechanisms within the correlated uncertainty space that are in quantitative agreement with the measured data, without relying on explicit parameter optimization. Global uncertainty and sensitivity analyses provide tools to determine the pathways and key factors that control the methanation activity within the parameter space. Together, these methods reveal that the degree of rate control approach can be misleading if parametric uncertainty is not considered. The procedure of considering uncertainties in the automated mechanism generation is not unique to CO2 methanation and can be easily extended to other challenging heterogeneously catalyzed reactions.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
German Research Foundation (DFG)
NA0003525; 290019031; 0000232253
USDOE Office of Science (SC), Basic Energy Sciences (BES)
USDOE National Nuclear Security Administration (NNSA)
SAND2022-8642J
ISSN:2691-3704
2691-3704
DOI:10.1021/jacsau.1c00276