Non-isothermal hydrogen desorption from β-UH3: Kinetics and mechanism

R. Ben David; N. Bitton; F. Simca; S. Samuha; D. Fadel; A. Danon; Y. Finkelstein

doi:10.1016/j.jnucmat.2018.08.023

Non-isothermal hydrogen desorption from β-UH₃: Kinetics and mechanism

R. Ben David, N. Bitton, F. Simca, S. Samuha, D. Fadel, A. Danon, Y. Finkelstein

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

4 Scopus citations

Abstract

Non-isothermal hydrogen desorption kinetics from β-UH₃ powder was investigated by means of temperature programmed desorption - mass spectrometry (TPD-MS). The hydride phase of the synthesized powder was determined by X-ray diffraction (XRD); particles size and morphology were characterized by scanning electron microscopy (SEM). The thermal decomposition (dehydrogenation) of β-UH₃ is found to follow a zero-order kinetics with an activation energy of 104 kJ/(mol H₂). By accounting for the observed kinetics and comparing the activation energy against reported density functional theory (DFT) values, a surface controlled mechanism, limited by surface recombination of hydrogen atoms is proposed.

Original language	English
Pages (from-to)	484-491
Number of pages	8
Journal	Journal of Nuclear Materials
Volume	510
DOIs	https://doi.org/10.1016/j.jnucmat.2018.08.023
State	Published - 1 Nov 2018
Externally published	Yes

Keywords

Desorption kinetics
Surface recombination
Temperature programmed desorption-mass spectrometry (TPD-MS)
Uranium hydride
Zero order kinetics

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

Access to Document

10.1016/j.jnucmat.2018.08.023

Cite this

@article{c6d5a0b06aec44938c7953456194bba2,

title = "Non-isothermal hydrogen desorption from β-UH3: Kinetics and mechanism",

abstract = "Non-isothermal hydrogen desorption kinetics from β-UH3 powder was investigated by means of temperature programmed desorption - mass spectrometry (TPD-MS). The hydride phase of the synthesized powder was determined by X-ray diffraction (XRD); particles size and morphology were characterized by scanning electron microscopy (SEM). The thermal decomposition (dehydrogenation) of β-UH3 is found to follow a zero-order kinetics with an activation energy of 104 kJ/(mol H2). By accounting for the observed kinetics and comparing the activation energy against reported density functional theory (DFT) values, a surface controlled mechanism, limited by surface recombination of hydrogen atoms is proposed.",

keywords = "Desorption kinetics, Surface recombination, Temperature programmed desorption-mass spectrometry (TPD-MS), Uranium hydride, Zero order kinetics",

author = "{Ben David}, R. and N. Bitton and F. Simca and S. Samuha and D. Fadel and A. Danon and Y. Finkelstein",

note = "Publisher Copyright: {\textcopyright} 2018",

year = "2018",

month = nov,

day = "1",

doi = "10.1016/j.jnucmat.2018.08.023",

language = "English",

volume = "510",

pages = "484--491",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

TY - JOUR

T1 - Non-isothermal hydrogen desorption from β-UH3

T2 - Kinetics and mechanism

AU - Ben David, R.

AU - Bitton, N.

AU - Simca, F.

AU - Samuha, S.

AU - Fadel, D.

AU - Danon, A.

AU - Finkelstein, Y.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Non-isothermal hydrogen desorption kinetics from β-UH3 powder was investigated by means of temperature programmed desorption - mass spectrometry (TPD-MS). The hydride phase of the synthesized powder was determined by X-ray diffraction (XRD); particles size and morphology were characterized by scanning electron microscopy (SEM). The thermal decomposition (dehydrogenation) of β-UH3 is found to follow a zero-order kinetics with an activation energy of 104 kJ/(mol H2). By accounting for the observed kinetics and comparing the activation energy against reported density functional theory (DFT) values, a surface controlled mechanism, limited by surface recombination of hydrogen atoms is proposed.

AB - Non-isothermal hydrogen desorption kinetics from β-UH3 powder was investigated by means of temperature programmed desorption - mass spectrometry (TPD-MS). The hydride phase of the synthesized powder was determined by X-ray diffraction (XRD); particles size and morphology were characterized by scanning electron microscopy (SEM). The thermal decomposition (dehydrogenation) of β-UH3 is found to follow a zero-order kinetics with an activation energy of 104 kJ/(mol H2). By accounting for the observed kinetics and comparing the activation energy against reported density functional theory (DFT) values, a surface controlled mechanism, limited by surface recombination of hydrogen atoms is proposed.

KW - Desorption kinetics

KW - Surface recombination

KW - Temperature programmed desorption-mass spectrometry (TPD-MS)

KW - Uranium hydride

KW - Zero order kinetics

UR - http://www.scopus.com/inward/record.url?scp=85052291763&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2018.08.023

DO - 10.1016/j.jnucmat.2018.08.023

M3 - Article

AN - SCOPUS:85052291763

SN - 0022-3115

VL - 510

SP - 484

EP - 491

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -