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化学学报
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化学学报 ›› 1996, Vol. 54 ›› Issue (9): 853-858. 上一篇    下一篇

研究论文

α-Bi~2Mo~3O~1~2/MoO~3催化剂的表面光电压谱研究

于剑锋;吴通好;王德军   

  1. 吉林大学化学系
  • 发布日期:1996-09-15

Studies of surface photovoltage spectra on α-Bi~2Mo~3O~1~2/MoO~3 catalysts

YU JIANFENG;WU TONGHAO;WANG DEJUN   

  • Published:1996-09-15

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合成了系列催化剂Bi~xPMo~1~2O~y(x=2-9, y=43-64), 高温焙烧后该系列催化剂的基本组成为白钨矿型的α-Bi~2Mo~3O~1~2/MoO~3。研究其表面光电压谱发现, 随着Bi/P比的增高, 相应的光电压响应呈现规律性变化。在该系列催化剂上的丙烷选择氧化实验结果表明, 铋含量增加, 催化剂中作为碱性位的阳离子缺陷的浓度随着白钨矿结构中阳离子空位的有序化而下降, 反映在光电压响应中对应着P~1带强度的减弱和P~2带的负移, 而与之对应的催化活性迅速下降。

关键词: 金属氧化物催化剂, 氧化铋, 丙烷, 氧化钼, 选择氧化, 表面光电压谱

A series of catalysts, Bi~xPMo~1~2O~y(x=2-9, y=43-64), was synthesized from 12-molybdophosphoric acid in acidic condition. The results indicated that the basic composition of the calcinated catalysts was α-Bi~2Mo~3O~1~2/MoO~3. It was found that with the increase of Bi/P molar ratio, the surface photovoltage spectra (SPS) of the catalysts exhibits regular evolutions characteristic. Another experiments using the samples as catalysts in selective oxidation of propane showed that the content of Bi increased, the amount of cation-flaw as basic capacity in the catalysts decreaed with the A vacancy in scheelite-type oxides (AMO~4) distribution in order. Correspondingly, the shift of P~2 band to negative electric field and decreased of P~1 band, the activity of catalytic decrease, rapidly.

Key words: METALLIC OXIDE CATALYST, BISMUTH OXIDE, PROPANE, MOLYBDENUM OXIDE, SELECTIVE OXIDATION

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