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采用硼酸三甲酯作为探针分子对Al2O3的路易斯碱性进行了红外光谱定量研究.Al2O3对硼酸三甲酯的吸附使硼酸三甲酯在1360cm-1的谱峰分裂成1409cm-1和1287cm-1两个峰,1036cm-1的谱峰紫移到1067cm-1.低压下吸收峰高与硼酸三甲酯压力成正比,与Al2O3含量成正比.结果表明Al2O3有一定的路易斯碱强度,与硼酸三甲酯之间的吸附是单分子层化学吸附.
The Lewis basicity of Al 2 O 3 was investigated by FT-IR spectroscopy using trimethyl borate as probe molecule.The adsorption of trimethyl borate on Al 2 O 3 led to the cleavage of trimethyl borate at 1360 cm -1 to 1409 cm -1 and 1287 cm -1, 1 peak at 1036cm-1 to 1067cm-1.The absorption peak height at low pressure is proportional to the pressure of trimethyl borate and is proportional to the content of Al2O3.The results show that Al2O3 has a certain Lewis base strength, Trimethyl ester adsorption between the monolayer chemisorption.