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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

Editorial Board: Waseda, Yoshio / Fecht, Hans-Jörg / Reddy, Ramana G. / Manna, Indranil / Nakajima, Hideo / Nakamura, Takashi / Okabe, Toru / Ostrovski, Oleg / Pericleous, Koulis / Seetharaman, Seshadri / Straumal, Boris / Suzuki, Shigeru / Tanaka, Toshihiro / Terzieff, Peter / Uda, Satoshi / Urban, Knut / Baron, Michel / Besterci, Michael / Byakova, Alexandra V. / Gao, Wei / Glaeser, Andreas / Gzesik, Z. / Hosson, Jeff / Masanori, Iwase / Jacob, Kallarackel Thomas / Kipouros, Georges / Kuznezov, Fedor


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Open Access
Online
ISSN
2191-0324
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Volume 33, Issue 4

Issues

Phase Transitions and Morphology Evolutions during Hydrogen Reduction of MoO3 to MoO2

Jie Dang
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
  • School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Guo-Hua Zhang
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
  • School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Kuo-Chih Chou
  • Corresponding author
  • State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
  • School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
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  • Other articles by this author:
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Published Online: 2013-10-29 | DOI: https://doi.org/10.1515/htmp-2013-0061

Abstract

In the present work, studies of phase transitions and morphology evolutions during hydrogen reduction of MoO3 to MoO2 were carried out in the temperature range from 678 to 829 K. It was found that no intermediate phase was formed and MoO2 was the unique detectable product during the reduction at 678 K. While above 713 K, an intermediate phase of Mo4O11 was formed. The formation of Mo4O11 was found to obey the consecutive mechanism under the experimental condition. Regarding the morphology evolution of MoO2 during reduction, it was found that in the temperature range from 713 to 733 K, MoO3 was firstly reduced to large spherical or oval Mo4O11 grains, then to small spherical or oval MoO2 ones. From 793 to 829 K, most of MoO3 grains were firstly reduced to large plateshaped Mo4O11 grains, subsequently to small plateshaped MoO2 ones.

Keywords: MoO3; Mo4O11; MoO2; formation mechanism; morphology evolutions; hydrogen reduction

PACS: 82.20.Hf

About the article

Received: 2013-06-30

Accepted: 2013-09-07

Published Online: 2013-10-29

Published in Print: 2014-08-01


Citation Information: High Temperature Materials and Processes, Volume 33, Issue 4, Pages 305–312, ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp-2013-0061.

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