| 过渡金属钼钒砷杂多化合物的合成与TPR,TPD研究 |
| Synthesis and TPR/TPD Investigation of Transition Metal Molybdovandoarsenic Heteropoly Compounds |
|
| 摘要: |
| 关键词: 杂多化合物 过渡金属 TPR TPD 氢溢流 |
| 基金项目: |
| Abstract: Seven transition metal molybdovanadoarsenic heteropoly compounds have been synthesized and characterized using IR, UV, TG-DTA, pH potential titration techniques. The molecular formulae of these compounds are pro-posed to be HxMyAsMO10V2O40·zH2O(x=1～3, y=1,2, M=Cr, Mn, Fe, Co, Ni, Cu, Zn).They are all keggin structure. Surface nature of these compounds have been investigated by temperature programmed desorption and temperature programmed reduction techniques. NH3-TPD results show that in TPD profiles of the compounds there are two desorption peaks corresponding to weak acid sites of desorption, respectively. Desorbing activativon energy and preexponential factor of weak acid site of desorption for compounds have been calculated. H2-TPR re-sults show that introducting transtion metal to molybdovanarsenic acid, the reduction peak temperatures of H2-TPR shift regularly with increasing d electron numbers of transition metals. In addition, Zn and Cu heteropoly com-pounds have yet apparent effect of hydrogen spill over. |
| Keywords: heteropolycompound transition metal TPR TPD hydrogen spill over |
| |
| 摘要点击次数: 1171 |
| 全文下载次数: 2052 |
| 蔡铁军,邓谦,黄德发,彭振山,龙云飞,陈亚中.过渡金属钼钒砷杂多化合物的合成与TPR,TPD研究[J].无机化学学报,2002,18(6):602-606. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
