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在原位红外光谱装置上,通过氨的吸,脱附,对脱水(320℃)LaHY分子筛上形成的羟基峰作了归属,对酸性质作了进一步的分析.其结果是:除强酸性羟基3638cm~(-1) (HY),3631cm~(-1)(LaHY)和3536cm~(-1)(HY)、3556cm~(-1)(LaHY)外,还有二种直接与镧离子联结的羟基,3520cm~(-1)归属为弱酸性,3531cm~(-1)归属为非酸性.从红外和固体核磁谱来说明,超笼中高频羟基的酸强度是非均一的。
In situ IR spectroscopy, the hydroxyl groups formed on the LaHY zeolite by dehydration (320 ℃) were attributed to the adsorption and desorption of ammonia, and the acid properties were further analyzed.The results were as follows: In addition to LaHY, 3638cm -1, 3631cm -1, 3556cm -1, and HYHY, there are two kinds of ions directly linked to lanthanum ions Of the hydroxyl group, 3520cm -1 belonged to weak acidity, and 3531cm -1 belonged to non-acidic. From the infrared and solid nuclear magnetic resonance spectra, the acid strength of the high-frequency hydroxyl group in the supercation was heterogeneous.