| 王翔,袁贤鑫.甲苯气相选择氧化制苯甲醛 Ⅳ.助剂锂、钾、铯对V_2O_5/TiO_2催化剂性能的影响[J].分子催化,1997,(2): |
| 甲苯气相选择氧化制苯甲醛 Ⅳ.助剂锂、钾、铯对V_2O_5/TiO_2催化剂性能的影响 |
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| DOI： |
| 中文关键词: 甲苯,苯甲醛,钒基催化剂,碱金属离子,助剂 |
| 英文关键词:Toluene,Benzaldehyde,Vanadium oxide catalyst,Alkali metal ion additive, |
| 基金项目: |
| 王翔 袁贤鑫 |
| 杭州大学催化研究所 |
| 摘要点击次数: 1033 |
| 全文下载次数: 18 |
| 中文摘要: |
| 在Ｖ２Ｏ５／ＴｉＯ２催化剂中分别添加Ｌｉ、Ｋ、Ｃｓ等碱金属离子，利用ＢＥＴ、ＸＲＤ、ＸＰＳ、Ｈ２－ＴＰＲ、Ｏ２－ＴＰＤ－ＭＳ和化学分析方法，研究了催化剂结构和性能的变化．结果表明，催化剂在添加不同碱金属离子后，其结构和表面活性氧发生了很大变化．Ｋ离子可以改善催化剂的活性、提高反应选择性；Ｌｉ离子能提高催化剂活性，但在相当宽的温度范围内使反应选择性下降；在６９３Ｋ以下，Ｃｓ离子对催化剂的活性和选择性均起抑制作用． |
| 英文摘要: |
| Alkali metal ions such as Li,K,Cs were added to V 2O 5/TiO 2 catalyst.BET,XRD,XPS,H 2 TPR,O 2 TPD MS,together with chemical analysis,were applied to study the change of catalyst structure and the performance of vapor phase catalytic oxidation of toluene.Results showed that the catalyst structure and surface oxygen canged greatly when various additives were used.K + increased the activity and selectivity of V 2O 5/TiO 2 catalyst;Li +increased the activity but decreased the selectivity;while Cs decreased both the activity and the selectivity of the catalyst. |
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