| B2O3/TiO2-ZrO2的结构表征及其与酸性和催化性能间的关系 |
| Structural Characterization of B2O3/TiO2-ZrO2 and its Effect on Acidity and Catalytic Performance for Beckmann Rearrangement of Cyclohexanone Oxime |
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| 摘要: 采用XRD、N2吸附、 11B MAS NMR、NH3-TPD和催化性能评价等方法研究了B2O3/TiO2-ZrO2催化剂的结构、酸性及催化环己酮肟气相Beckmann重排反应性能间的关系。结果表明,催化剂中的B2O3同时以三配位的BO3和四配位的BO4结构单元存在; |
| 关键词: B2O3/TiO2-ZrO2 结构 酸性 催化性能 |
| 基金项目: |
| Abstract: The relationship between structure, acidity and catalytic performance of titania-zirconia supported boria cata-lysts (B2O3/TiO2-ZrO2) for vapor-phase beckmann rearrangement of cyclohexanone oxime to ε-caprolactam was investigated. A series of catalysts with boria loading ranging from 8 to 20% wt. were prepared and characterized by XRD, adsorption of nitrogen, 11B MAS NMR and NH3-TPD techniques. Both tetrahedral BO4 and trigonal BO3 species were detected as the basic units of the supported boria. The ratio of the two boron species was dependent on the boria loading. The coordination of boron appeared to significantly affect the acidities of these materials and the acidity was closely related to the relative amount of BO3. The catalytic performance of B2O3/TiO2-ZrO2 catalyst for vapor-phase beckmann rearrangement reaction was correlated closely to the acid site of medium strength. |
| Keywords: B2O3/TiO2-ZrO2 structure acidity catalytic performance |
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| 毛东森,陈庆龄,卢冠忠.B2O3/TiO2-ZrO2的结构表征及其与酸性和催化性能间的关系[J].无机化学学报,2002,18(11):1086-1092. |
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