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Title: Extracting meaningful standard enthalpies and entropies of activation for surface reactions from kinetic rates

Abstract

While analyses based on the Arrhenius kinetic model have been successfully applied since its introduction, the Arrhenius model neglects to describe pre-exponential factor in a scientifically meaningful fashion. Since the 1930s, transition-state theory (TST), has met with success in interpreting the pre-exponential factor’s value, allowing a standard entropy of activation to be estimated. However, analyses based on TST’s assumptions have been applied inconsistently in the literature, particularly in corrosion science, leading to difficulty in comparison of standard entropy of activations from different studies. In this work, the foundational principles of TST and standard states are discussed and a standard method to apply TST in analyzing rates of surface reactions is recommended. When full details are not available, reacting species’ concentrations should be normalized to the concentration of active surface sites. For corrosion reactions, conversion relationships are given to convert from units of corrosion rate to surface reaction rate, consistent with TST. This method is dubbed a surface reactant equi-density approximation. Application of this standard to reported data results in adjustments of the standard entropy of activation between - 65 and +50 J/mol K and brings reported entropies into a narrower range of values.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1606821
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Reaction Kinetics, Mechanisms and Catalysis
Additional Journal Information:
Journal Volume: 129; Journal Issue: 2; Journal ID: ISSN 1878-5190
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Doyle, Peter J., Savara, Aditya Ashi, and Raiman, Stephen S. Extracting meaningful standard enthalpies and entropies of activation for surface reactions from kinetic rates. United States: N. p., 2020. Web. doi:10.1007/s11144-020-01747-2.
Doyle, Peter J., Savara, Aditya Ashi, & Raiman, Stephen S. Extracting meaningful standard enthalpies and entropies of activation for surface reactions from kinetic rates. United States. doi:https://doi.org/10.1007/s11144-020-01747-2
Doyle, Peter J., Savara, Aditya Ashi, and Raiman, Stephen S. Wed . "Extracting meaningful standard enthalpies and entropies of activation for surface reactions from kinetic rates". United States. doi:https://doi.org/10.1007/s11144-020-01747-2. https://www.osti.gov/servlets/purl/1606821.
@article{osti_1606821,
title = {Extracting meaningful standard enthalpies and entropies of activation for surface reactions from kinetic rates},
author = {Doyle, Peter J. and Savara, Aditya Ashi and Raiman, Stephen S.},
abstractNote = {While analyses based on the Arrhenius kinetic model have been successfully applied since its introduction, the Arrhenius model neglects to describe pre-exponential factor in a scientifically meaningful fashion. Since the 1930s, transition-state theory (TST), has met with success in interpreting the pre-exponential factor’s value, allowing a standard entropy of activation to be estimated. However, analyses based on TST’s assumptions have been applied inconsistently in the literature, particularly in corrosion science, leading to difficulty in comparison of standard entropy of activations from different studies. In this work, the foundational principles of TST and standard states are discussed and a standard method to apply TST in analyzing rates of surface reactions is recommended. When full details are not available, reacting species’ concentrations should be normalized to the concentration of active surface sites. For corrosion reactions, conversion relationships are given to convert from units of corrosion rate to surface reaction rate, consistent with TST. This method is dubbed a surface reactant equi-density approximation. Application of this standard to reported data results in adjustments of the standard entropy of activation between - 65 and +50 J/mol K and brings reported entropies into a narrower range of values.},
doi = {10.1007/s11144-020-01747-2},
journal = {Reaction Kinetics, Mechanisms and Catalysis},
number = 2,
volume = 129,
place = {United States},
year = {2020},
month = {3}
}

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