Journal
RARE METALS
Volume 40, Issue 3, Pages 687-692Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-019-01367-3
Keywords
Scandia; Tungsten oxide; Reduction kinetics
Funding
- National Key Research and Development Program of China [2017YFA0701000, 2016YFE0126900]
- National Natural Science Foundation of China [51471006, 51534009, 52621003]
- Fundamental Research Funds for the Central Universities [ZYGX2018J024, ZYGX2015Z010]
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Sc2O3-doped WO3 powder was prepared using spray-drying method and showed lower reduction activation energy and higher reduction rate compared to pure WO3. The obtained powder has a narrow size distribution between 0.6-0.8 μm.
As an important powder material for scandate cathode, Sc2O3-doped WO3 powder together with hollow spherical WO3 for comparison was prepared by spray-drying method. The reduction behavior and kinetics of pure WO3 and Sc2O3-doped WO3 were studied by temperature-programmed reduction (TPR) method. It is found that scandia doping can decrease the reduction activation energy of WO3 and thus lower the reduction temperature and increase the reduction rate. Based on the kinetics results, the reduction techniques are presented. The obtained powder has a narrow size distribution in the range of 0.6-0.8 mu m.
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