| γ-Al2O3表面结构的红外光谱研究 |
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| 引用本文： | 赵国利,王少军,凌凤香,吴洪新,崔晓莉,张玉涵.γ-Al2O3表面结构的红外光谱研究[J].当代化工,2012,41(7):661-663,667. |
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| 作者姓名： | 赵国利 王少军 凌凤香 吴洪新 崔晓莉 张玉涵 |
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| 作者单位： | 1. 中国石化抚顺石油化工研究院,辽宁抚顺,113001
2. 辽宁石油化工大学,辽宁抚顺,113001 |
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| 摘 要： | 采用原位红外光谱技术对不同温度(100～500℃)脱水γ-Al2O3的表面羟基进行了研究,同时应用吡啶吸附原位红外光谱法对γ-Al2O3表面上路易斯酸(L酸)进行了研究.实验结果表明,在升高脱水温度的过程中,在γ-Al2O3表面共出现五个羟基谱带,分别为3785,3762,3725,3697,3674 cm-1.在γ-Al2O3表面上存在三种L酸性位,分别对应于五配位(酸性最弱)、四配位(酸性中等)和三配位的Al3+(酸性最强).这三种Al3+的数量随脱水温度升高而增大,而且γ-Al2O3表面上的L酸性位均有羟基与其相连.
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| 关 键 词： | 红外光谱 γ-Al2O3 羟基 L酸性位 |
Infrared Spectroscopic Study of the Surface of γ-Alumina |
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| ZHAO Guo-li
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WANG Shao-jun
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LING Feng-xiang
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WU Hong-xin
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CUI Xiao-li
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ZHANG Yu-han.Infrared Spectroscopic Study of the Surface of γ-Alumina[J].Contemporary Chemical Industry,2012,41(7):661-663,667. |
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| Authors: | ZHAO Guo-li WANG Shao-jun LING Feng-xiang WU Hong-xin CUI Xiao-li ZHANG Yu-han |
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| Affiliation: | 1.Fushun Research Institute of Petroleum and Petrochemicals,Liaoning Fushun 113001,China; 2.Liaoning Shihua University,Liaoning Fushun 113001,China) |
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| Abstract: | OH groups and Lewis acid sites on the surface of γ-Alumina dehydrated at different temperature(100~500 ℃) were studied by using conventional pyridine adsorption/FT-IR.The experimental results show that five OH groups(3 785,3 762,3 725,3 697,3 674 cm-1) are found on the surface in the process of increasing dehydration temperature.The results also demonstrate that only three types of Lewis acid sites on the surface correspond to the three possible Al3+ coordination configurations,and five-coordination Al3+ sites are weak Lewis acid sites,while the three-and four-coordinate Al3+ sites are strong and medium strong Lewis acid sites,respectively.The numbers of weak,medium and strong Lewis acid sites change with dehydration temperature,and all types of Lewis acid sites have adjacent OH groups. |
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| Keywords: | Infrared spectroscopy γ-alumina OH Lewis acid site |
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