Oxidation Investigation of NBG-18 Nuclear-Grade Graphite

Joshua Kane; C. Karthik; Rick Ubic; William E. Windes; Darryl P. Butt; Karthik Chinnathambi

Oxidation Investigation of NBG-18 Nuclear-Grade Graphite

Joshua Kane, C. Karthik, Rick Ubic, William E. Windes, Darryl P. Butt, Karthik Chinnathambi

Micron School of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

The oxidation kinetics of NBG-18 nuclear graphite was investigated between 500 and 775°C with oxygen partial pressures ranging from 10 to 40 kPa. Using a phenomenological shrinking-core model, reaction rates normalized to the reactive surface area were determined. In addition, a more rigorous, mechanism-based model is proposed for the reaction rate of nuclear graphites based on observed spill-over of the carbon-oxygen surface intermediate onto the graphite basal plane. This mechanistic model suggests the reaction is controlled simultaneously by the dissociative chemisorption of oxygen and the desorption of reactive surface intermediates to form CO(g) and CO2(g). The activation energies for these processes were approximated as180±10, 260±10 and 190±10 kJ/mol, respectively.

Original language	American English
Journal	Transactions of the American Nuclear Society
State	Published - 24 Jun 2012

EGS Disciplines

Materials Science and Engineering

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@article{87a670f5643f4639bd4a34b9fd9c015e,

title = "Oxidation Investigation of NBG-18 Nuclear-Grade Graphite",

abstract = "The oxidation kinetics of NBG-18 nuclear graphite was investigated between 500 and 775°C with oxygen partial pressures ranging from 10 to 40 kPa. Using a phenomenological shrinking-core model, reaction rates normalized to the reactive surface area were determined. In addition, a more rigorous, mechanism-based model is proposed for the reaction rate of nuclear graphites based on observed spill-over of the carbon-oxygen surface intermediate onto the graphite basal plane. This mechanistic model suggests the reaction is controlled simultaneously by the dissociative chemisorption of oxygen and the desorption of reactive surface intermediates to form CO(g) and CO2(g). The activation energies for these processes were approximated as180±10, 260±10 and 190±10 kJ/mol, respectively.",

author = "Joshua Kane and C. Karthik and Rick Ubic and Windes, \{William E.\} and Butt, \{Darryl P.\} and Karthik Chinnathambi",

year = "2012",

month = jun,

day = "24",

language = "American English",

}

TY - JOUR

T1 - Oxidation Investigation of NBG-18 Nuclear-Grade Graphite

AU - Kane, Joshua

AU - Karthik, C.

AU - Ubic, Rick

AU - Windes, William E.

AU - Butt, Darryl P.

AU - Chinnathambi, Karthik

PY - 2012/6/24

Y1 - 2012/6/24

N2 - The oxidation kinetics of NBG-18 nuclear graphite was investigated between 500 and 775°C with oxygen partial pressures ranging from 10 to 40 kPa. Using a phenomenological shrinking-core model, reaction rates normalized to the reactive surface area were determined. In addition, a more rigorous, mechanism-based model is proposed for the reaction rate of nuclear graphites based on observed spill-over of the carbon-oxygen surface intermediate onto the graphite basal plane. This mechanistic model suggests the reaction is controlled simultaneously by the dissociative chemisorption of oxygen and the desorption of reactive surface intermediates to form CO(g) and CO2(g). The activation energies for these processes were approximated as180±10, 260±10 and 190±10 kJ/mol, respectively.

AB - The oxidation kinetics of NBG-18 nuclear graphite was investigated between 500 and 775°C with oxygen partial pressures ranging from 10 to 40 kPa. Using a phenomenological shrinking-core model, reaction rates normalized to the reactive surface area were determined. In addition, a more rigorous, mechanism-based model is proposed for the reaction rate of nuclear graphites based on observed spill-over of the carbon-oxygen surface intermediate onto the graphite basal plane. This mechanistic model suggests the reaction is controlled simultaneously by the dissociative chemisorption of oxygen and the desorption of reactive surface intermediates to form CO(g) and CO2(g). The activation energies for these processes were approximated as180±10, 260±10 and 190±10 kJ/mol, respectively.

UR - https://scholarworks.boisestate.edu/mse_facpubs/155

M3 - Article

SN - 0003-018X

JO - Transactions of the American Nuclear Society

JF - Transactions of the American Nuclear Society

ER -

Oxidation Investigation of NBG-18 Nuclear-Grade Graphite

Abstract

EGS Disciplines

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