Pre-reduction Kinetics of WO2.72 in a Fluidized Bed
Pre-reduction Kinetics of WO2.72 in a Fluidized Bed
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WO2.72在流化床中的预还原动力学
DOI：
10.1021/acs.iecr.2c01024
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发表时间：
2022-05
影响因子：
4.2
通讯作者：
Zhan Du
中科院分区：
文献类型：
--
作者：
Jiayi Liu;Junhui Shang;Feng Pan;Zhan Du
本文采用CO-CO2-N2混合气体对WO2.72进行预还原制备WO 2。系统研究了还原电位（CO/（CO + CO2））、反应温度、停留时间等因素对WO 2. 72预还原过程的影响，并拟合了预还原过程的动力学方程。结果表明，WO2.72的还原度与还原电位和反应温度呈正相关。当还原电位为0.9，反应温度为950 ℃，反应时间为60 min时，WO2.72几乎完全转化为WO 2。动力学拟合结果表明，在850-950 °C范围内，预还原过程符合Avrami-Erofe′ev模型，平均活化能为74.20 kJ/mol。还原度与反应温度、还原电位和停留时间的关系可表示为：x=1-（1 - 10.02374xCO-0.01683exp（-74.20T）t）3
In this paper, WO2was obtained by the pre-reduction of WO2.72under the mixture of CO-CO2-N2. The influence of some factors such as reduction potential (CO/(CO + CO2)), reaction temperature, and residence time on the pre-reduction of WO2.72was investigated systematically; the kinetic equation of the pre-reduction process was also fitted. The results demonstrated that the reduction degree of WO2.72was positively correlated with the reduction potential and reaction temperature. WO2.72could be almost completely converted to WO2when it was reacted at 950 °C for 60 min under a reduction potential of 0.9. The dynamic fitting results showed that the pre-reduction process satisfied the Avrami–Erofe′ev model with an average activation energy of 74.20 kJ/mol in the range of 850–950 °C. The relationships between the reduction degree and the reaction temperature, reduction potential, and residence time could be expressed as follows: x=1−(1−10.02374xCO−0.01683exp(−74.20T)t)3
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DOI：
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