中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 2 February 2026 |
（a Zhongyuan Critical Metals Laboratory, Zhengzhou University, Zhengzhou 450001, China;
b National Key Laboratory for Special Rare Metal Materials, Zhengzhou University, Zhengzhou 450001, China;
c School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China）
Abstract:The hydrogen reduction kinetics of tungsten trioxide (WO3) was investigated via non-isothermal thermogravimetric analysis. Under the local gas–solid reduction conditions, the particle morphology of tungsten powders was found to be consistent with that of raw material WO3. The removal of oxygen from tungsten oxide during hydrogen reduction led to the formation of porous structures between the reduced particles, which were obviously different from the polyhedral single-crystal configuration of tungsten powders obtained via chemical vapor deposition. Moreover, the two-stage hydrogen reduction mechanisms of WO3 under the local gas–solid reduction conditions can be described using the composite autocatalytic function. The activation energies of the first and second stages of the hydrogen reduction of WO3 were determined to be 121 and 135 kJ/mol, respectively.
Key words: tungsten trioxide; tungsten powder; hydrogen reduction; reaction kinetics; particle morphology
