Hydrogen reduction behavior of W/Y2O3 powder synthesized by ultrasonic spray pyrolysis

Won June Choi; Jeong Hyun Kim; Hojun Lee; Chun Woong Park; Young In Lee; Jongmin Byun

doi:10.1016/j.ijrmhm.2020.105450

Hydrogen reduction behavior of W/Y₂O₃ powder synthesized by ultrasonic spray pyrolysis

Won June Choi, Jeong Hyun Kim, Hojun Lee, Chun Woong Park, Young In Lee, Jongmin Byun

Dept. of Materials Science & Engineering

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

13 Scopus citations

Abstract

In this study, hydrogen reduction behavior of W/Y₂O₃ powder was investigated. Phase transformation of WO₃/Y₂O₃ powder was observed during the hydrogen reduction process in the temperature range of 400–800 °C for up to 5 h. The reduction behavior was investigated by the morphology images and the x-ray diffraction (XRD) patterns of the reduced powders at each step. The reduction of WO₃/Y₂O₃ powder was started from the outer region of powder, and the crack was occurred at outer region due to the transformation, which was able to be explained by crackling core model. The particle size of W/Y₂O₃ decreased due to the addition of Y₂O₃ particle compared to that of W powder. The activation energy of WO₃/Y₂O₃ powder was calculated via temperature programmed reduction (TPR) analysis, and WO₃/Y₂O₃ and WO₃ powder had a difference in activation energy calculated from first peaks in TPR analysis. The addition of Y₂O₃ particle affected the reduction behavior, especially reduction of WO₃ phase to WO_x (2 ≤ x < 3) phases.

Original language	English
Article number	105450
Journal	International Journal of Refractory Metals and Hard Materials
Volume	95
DOIs	https://doi.org/10.1016/j.ijrmhm.2020.105450
State	Published - Feb 2021

Keywords

Activation energy
Hydrogen reduction
Reduction behavior
W/YO powder

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10.1016/j.ijrmhm.2020.105450

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@article{6c64a53f8dde430785d44fdf2542ccd5,

title = "Hydrogen reduction behavior of W/Y2O3 powder synthesized by ultrasonic spray pyrolysis",

abstract = "In this study, hydrogen reduction behavior of W/Y2O3 powder was investigated. Phase transformation of WO3/Y2O3 powder was observed during the hydrogen reduction process in the temperature range of 400–800 °C for up to 5 h. The reduction behavior was investigated by the morphology images and the x-ray diffraction (XRD) patterns of the reduced powders at each step. The reduction of WO3/Y2O3 powder was started from the outer region of powder, and the crack was occurred at outer region due to the transformation, which was able to be explained by crackling core model. The particle size of W/Y2O3 decreased due to the addition of Y2O3 particle compared to that of W powder. The activation energy of WO3/Y2O3 powder was calculated via temperature programmed reduction (TPR) analysis, and WO3/Y2O3 and WO3 powder had a difference in activation energy calculated from first peaks in TPR analysis. The addition of Y2O3 particle affected the reduction behavior, especially reduction of WO3 phase to WOx (2 ≤ x < 3) phases.",

keywords = "Activation energy, Hydrogen reduction, Reduction behavior, W/YO powder",

author = "Choi, \{Won June\} and Kim, \{Jeong Hyun\} and Hojun Lee and Park, \{Chun Woong\} and Lee, \{Young In\} and Jongmin Byun",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2021",

month = feb,

doi = "10.1016/j.ijrmhm.2020.105450",

language = "English",

volume = "95",

journal = "International Journal of Refractory Metals and Hard Materials",

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TY - JOUR

T1 - Hydrogen reduction behavior of W/Y2O3 powder synthesized by ultrasonic spray pyrolysis

AU - Choi, Won June

AU - Kim, Jeong Hyun

AU - Lee, Hojun

AU - Park, Chun Woong

AU - Lee, Young In

AU - Byun, Jongmin

PY - 2021/2

Y1 - 2021/2

N2 - In this study, hydrogen reduction behavior of W/Y2O3 powder was investigated. Phase transformation of WO3/Y2O3 powder was observed during the hydrogen reduction process in the temperature range of 400–800 °C for up to 5 h. The reduction behavior was investigated by the morphology images and the x-ray diffraction (XRD) patterns of the reduced powders at each step. The reduction of WO3/Y2O3 powder was started from the outer region of powder, and the crack was occurred at outer region due to the transformation, which was able to be explained by crackling core model. The particle size of W/Y2O3 decreased due to the addition of Y2O3 particle compared to that of W powder. The activation energy of WO3/Y2O3 powder was calculated via temperature programmed reduction (TPR) analysis, and WO3/Y2O3 and WO3 powder had a difference in activation energy calculated from first peaks in TPR analysis. The addition of Y2O3 particle affected the reduction behavior, especially reduction of WO3 phase to WOx (2 ≤ x < 3) phases.

AB - In this study, hydrogen reduction behavior of W/Y2O3 powder was investigated. Phase transformation of WO3/Y2O3 powder was observed during the hydrogen reduction process in the temperature range of 400–800 °C for up to 5 h. The reduction behavior was investigated by the morphology images and the x-ray diffraction (XRD) patterns of the reduced powders at each step. The reduction of WO3/Y2O3 powder was started from the outer region of powder, and the crack was occurred at outer region due to the transformation, which was able to be explained by crackling core model. The particle size of W/Y2O3 decreased due to the addition of Y2O3 particle compared to that of W powder. The activation energy of WO3/Y2O3 powder was calculated via temperature programmed reduction (TPR) analysis, and WO3/Y2O3 and WO3 powder had a difference in activation energy calculated from first peaks in TPR analysis. The addition of Y2O3 particle affected the reduction behavior, especially reduction of WO3 phase to WOx (2 ≤ x < 3) phases.

KW - Activation energy

KW - Hydrogen reduction

KW - Reduction behavior

KW - W/YO powder

UR - https://www.scopus.com/pages/publications/85097714835

U2 - 10.1016/j.ijrmhm.2020.105450

DO - 10.1016/j.ijrmhm.2020.105450

M3 - Article

AN - SCOPUS:85097714835

SN - 0263-4368

VL - 95

JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

M1 - 105450

ER -

Hydrogen reduction behavior of W/Y₂O₃ powder synthesized by ultrasonic spray pyrolysis

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Keywords

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