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Title: Analysis of reaction schemes using maximum rates of constituent steps

Abstract

We show that the steady-state kinetics of a chemical reaction can be analyzed analytically in terms of proposed reaction schemes composed of series of steps with stoichiometric numbers equal to unity by calculating the maximum rates of the constituent steps, r max, i , assuming that all of the remaining steps are quasi-equilibrated. Analytical expressions can be derived in terms of r max, i to calculate degrees of rate control for each step to determine the extent to which each step controls the rate of the overall stoichiometric reaction. The values of r max, i can be used to predict the rate of the overall stoichiometric reaction, making it possible to estimate the observed reaction kinetics. This approach can be used for catalytic reactions to identify transition states and adsorbed species that are important in controlling catalyst performance, such that detailed calculations using electronic structure calculations (e.g., density functional theory) can be carried out for these species, whereas more approximate methods (e.g., scaling relations) are used for the remaining species. This approach to assess the feasibility of proposed reaction schemes is exact for reaction schemes where the stoichiometric coefficients of the constituent steps aremore » equal to unity and the most abundant adsorbed species are in quasi-equilibrium with the gas phase and can be used in an approximate manner to probe the performance of more general reaction schemes, followed by more detailed analyses using full microkinetic models to determine the surface coverages by adsorbed species and the degrees of rate control of the elementary steps.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1252317
Alternate Identifier(s):
OSTI ID: 1347582
Grant/Contract Number:  
SC0014058
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 113 Journal Issue: 21; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; chemical kinetics; catalysis; microkinetics

Citation Formats

Motagamwala, Ali Hussain, and Dumesic, James A. Analysis of reaction schemes using maximum rates of constituent steps. United States: N. p., 2016. Web. doi:10.1073/pnas.1605742113.
Motagamwala, Ali Hussain, & Dumesic, James A. Analysis of reaction schemes using maximum rates of constituent steps. United States. doi:10.1073/pnas.1605742113.
Motagamwala, Ali Hussain, and Dumesic, James A. Mon . "Analysis of reaction schemes using maximum rates of constituent steps". United States. doi:10.1073/pnas.1605742113.
@article{osti_1252317,
title = {Analysis of reaction schemes using maximum rates of constituent steps},
author = {Motagamwala, Ali Hussain and Dumesic, James A.},
abstractNote = {We show that the steady-state kinetics of a chemical reaction can be analyzed analytically in terms of proposed reaction schemes composed of series of steps with stoichiometric numbers equal to unity by calculating the maximum rates of the constituent steps, r max, i , assuming that all of the remaining steps are quasi-equilibrated. Analytical expressions can be derived in terms of r max, i to calculate degrees of rate control for each step to determine the extent to which each step controls the rate of the overall stoichiometric reaction. The values of r max, i can be used to predict the rate of the overall stoichiometric reaction, making it possible to estimate the observed reaction kinetics. This approach can be used for catalytic reactions to identify transition states and adsorbed species that are important in controlling catalyst performance, such that detailed calculations using electronic structure calculations (e.g., density functional theory) can be carried out for these species, whereas more approximate methods (e.g., scaling relations) are used for the remaining species. This approach to assess the feasibility of proposed reaction schemes is exact for reaction schemes where the stoichiometric coefficients of the constituent steps are equal to unity and the most abundant adsorbed species are in quasi-equilibrium with the gas phase and can be used in an approximate manner to probe the performance of more general reaction schemes, followed by more detailed analyses using full microkinetic models to determine the surface coverages by adsorbed species and the degrees of rate control of the elementary steps.},
doi = {10.1073/pnas.1605742113},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 21,
volume = 113,
place = {United States},
year = {2016},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1605742113

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Cited by: 5 works
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