吸附
密度泛函理论
氢
水合物
氢键
钨
结晶学
化学
物理化学
粘结长度
氢气储存
晶体结构
材料科学
计算化学
分子
有机化学
作者
Pingguo Jiang,Yiyu Xiao,Xiangbiao Yu,Wenjie Liu
摘要
Abstract The density functional theory (DFT) calculation of hydrogen adsorption on tungsten oxides and calculation of the crystal structure of WO 3 , W 20 O 58 , and W 18 O 49 were performed . These calculations suggest that the length of W‐O bonds in WO 3 are 1.913 Å, the length of 66% W‐O bonds in W 20 O 58 is 1.8 to 1.9 Å, and the length of 43.48% W‐O bonds in W 18 O 49 is longer than 2.0 Å. The hydrate (WO 2 [OH] 2 ), as an autocatalyst in the hydrogen reduction process, was found in the particular adsorption configuration of W 18 O 49 . The WO 3 and W 20 O 58 were completely reduced within 40 to 60 minutes at a temperature of 1000°C and at a hydrogen flow rate of 200 mL/min, while W 18 O 49 was completely reduced within 20 to 40 minutes. The phase composition and micromorphology of raw material and production were studied by both X‐ray diffraction analysis (XRD) and FE‐SEM technology. The differences of the mechanism of hydrogen adsorption on WO 3 , W 20 O 58 , and W 18 O 49 were explored based on the density functional theory calculation and the hydrogen reduction experiments.
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