| TiO_2载体表面酸性的研究 |
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| 引用本文： | 刘敬利,蒋建明,魏昭彬,辛勤.TiO_2载体表面酸性的研究[J].石油化工,1993(11). |
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| 作者姓名： | 刘敬利 蒋建明 魏昭彬 辛勤 |
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| 作者单位： | 化工部天津化工研究院，化工部天津化工研究院，中国科学院大连化学物理研究所催化基础国家重点实验室，中国科学院大连化学物理研究所催化基础国家重点实验室 天津 300131，天津 300131，大连 116023，大连 116023 |
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| 摘 要： | 利用NH_3吸附和吡啶吸附红外技术研究TiO_2的制备条件对其表面酸性的影响。结果表明,用NH_3水中和TiCl_4溶液方法制备的TiO_2(A)表面有较强的L酸中心,中和条件对表面酸性中心数目和强度有显著影响。由TiOSO_4水解方法制备的TiO_2(B)表面具有较强的L酸中心和较弱的B酸中心,引入不同添加剂可有效地调变TiO_2载体表面的酸性。
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| 关 键 词： | TiO_2载体 表面酸性 NH_3-TPD 吡啶吸附 红外光谱 |
Studies of the Surface Acidity of TiO_2 Carriers |
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| Liu Jingli and Jiang Jianming.Studies of the Surface Acidity of TiO_2 Carriers[J].Petrochemical Technology,1993(11). |
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| Authors: | Liu Jingli and Jiang Jianming |
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| Abstract: | The effect of preparation technique on the surface acidity of TiO_2 carrier was studied by NH_3-TPD and infrared spectroscopy of pyridine adsorption. The results show that: (1) TiO_2(A) prepared by neutralizing TiCl_4 solution with ammonia water exhibits a Lewis acid site, and its strength and amount are obviously influenced by preparation conditions. (2) TiO_2(B) prepared by hydrolysis of TiOSO_4 has strong Lewis and weak Bronsted acid sites. The introduction of K, Mg, Zn, Ca, Al and Si can effectively modify the surface acidity of TiO_2. |
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| Keywords: | TiO_2 carrier surface acidity NH_3-TPD Pyridine adsorption infrared spectroscopy |
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