Hydrogen isotopic effect during the graphite high-temperature corrosion in water vapours

Abstract

This paper presents the results on a study the processes of physicochemical interactions of water with graphite. The main regularities of the formation of H ₂ , HD and D ₂ molecules on the graphite surface were determined. It was shown that the fraction of D ₂ and HD in the gaseous outcome increases in the process of heating, and the quasi-equilibrium state of the graphite's absorption of hydrogen isotopes at the initial stages of interaction is significant: the flow of dissolved atoms into the sample volume is higher than the desorption flow. We suppose that this is due to the higher rate of dissolution of hydrogen atoms in the volume of graphite. We also estimated also the separation factor for the graphite surface-volume system for hydrogen atoms, which was 1.53 for the selected experimental conditions. The temperature dependence of the effective rate constant K _s for the formation of hydrogen isotope molecules in the interaction of graphite with water vapour in the range of 1100 °C–1200 °C was determined. It turned out that K _S (D ₂ ) > K _S (HD) > K _S (H ₂ ).

Original language	English
Journal	International Journal of Hydrogen Energy
DOIs	https://doi.org/10.1016/j.ijhydene.2019.03.013
Publication status	Published - 1 Jan 2019

Keywords

Corrosion
DSC
Graphite
Hydrogen
TGA

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

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10.1016/j.ijhydene.2019.03.013

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@article{b6a644b48a554dc08f0b1553bf51bf7a,

title = "Hydrogen isotopic effect during the graphite high-temperature corrosion in water vapours",

abstract = " This paper presents the results on a study the processes of physicochemical interactions of water with graphite. The main regularities of the formation of H 2 , HD and D 2 molecules on the graphite surface were determined. It was shown that the fraction of D 2 and HD in the gaseous outcome increases in the process of heating, and the quasi-equilibrium state of the graphite's absorption of hydrogen isotopes at the initial stages of interaction is significant: the flow of dissolved atoms into the sample volume is higher than the desorption flow. We suppose that this is due to the higher rate of dissolution of hydrogen atoms in the volume of graphite. We also estimated also the separation factor for the graphite surface-volume system for hydrogen atoms, which was 1.53 for the selected experimental conditions. The temperature dependence of the effective rate constant K s for the formation of hydrogen isotope molecules in the interaction of graphite with water vapour in the range of 1100 °C–1200 °C was determined. It turned out that K S (D 2 ) > K S (HD) > K S (H 2 ). ",

keywords = "Corrosion, DSC, Graphite, Hydrogen, TGA",

author = "Yevgen Chikhray and Saulet Askerbekov and Inesh Kenzhina and Yuriy Gordienko and Vadim Bochkov and Evgeny Nesterov and Natalia Varlamova",

year = "2019",

month = jan,

day = "1",

doi = "10.1016/j.ijhydene.2019.03.013",

language = "English",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Hydrogen isotopic effect during the graphite high-temperature corrosion in water vapours

AU - Chikhray, Yevgen

AU - Askerbekov, Saulet

AU - Kenzhina, Inesh

AU - Gordienko, Yuriy

AU - Bochkov, Vadim

AU - Nesterov, Evgeny

AU - Varlamova, Natalia

PY - 2019/1/1

Y1 - 2019/1/1

N2 - This paper presents the results on a study the processes of physicochemical interactions of water with graphite. The main regularities of the formation of H 2 , HD and D 2 molecules on the graphite surface were determined. It was shown that the fraction of D 2 and HD in the gaseous outcome increases in the process of heating, and the quasi-equilibrium state of the graphite's absorption of hydrogen isotopes at the initial stages of interaction is significant: the flow of dissolved atoms into the sample volume is higher than the desorption flow. We suppose that this is due to the higher rate of dissolution of hydrogen atoms in the volume of graphite. We also estimated also the separation factor for the graphite surface-volume system for hydrogen atoms, which was 1.53 for the selected experimental conditions. The temperature dependence of the effective rate constant K s for the formation of hydrogen isotope molecules in the interaction of graphite with water vapour in the range of 1100 °C–1200 °C was determined. It turned out that K S (D 2 ) > K S (HD) > K S (H 2 ).

AB - This paper presents the results on a study the processes of physicochemical interactions of water with graphite. The main regularities of the formation of H 2 , HD and D 2 molecules on the graphite surface were determined. It was shown that the fraction of D 2 and HD in the gaseous outcome increases in the process of heating, and the quasi-equilibrium state of the graphite's absorption of hydrogen isotopes at the initial stages of interaction is significant: the flow of dissolved atoms into the sample volume is higher than the desorption flow. We suppose that this is due to the higher rate of dissolution of hydrogen atoms in the volume of graphite. We also estimated also the separation factor for the graphite surface-volume system for hydrogen atoms, which was 1.53 for the selected experimental conditions. The temperature dependence of the effective rate constant K s for the formation of hydrogen isotope molecules in the interaction of graphite with water vapour in the range of 1100 °C–1200 °C was determined. It turned out that K S (D 2 ) > K S (HD) > K S (H 2 ).

KW - Corrosion

KW - DSC

KW - Graphite

KW - Hydrogen

KW - TGA

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U2 - 10.1016/j.ijhydene.2019.03.013

DO - 10.1016/j.ijhydene.2019.03.013

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