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本文用吡啶吸附红外光谱和升温脱附的方法,研究了以γ-Al_2O_3为主要成份的载体表面酸性,观察了γ-Al_2O_3和超稳 Y 型沸石(USY)的表面羟基。吸附吡啶的红外光谱表明,γ-Al_2O_3及不含 USY 的样品表面酸主要以非质子酸(L 酸)形式存在,超稳 Y 型沸石(USY)及其和γ-Al_2O_3配制的样品含有非质子酸(L 酸)和质子酸(B 酸)两种类型,还讨论了升温脱附过程中光谱变化规律。
In this paper, the surface acidity of γ-Al 2 O 3 as the main component was investigated by pyridine adsorption infrared spectroscopy and temperature desorption. The surface hydroxyl groups of γ-Al 2 O 3 and ultra-stable Y-type zeolite (USY) were observed. The infrared spectra of pyridine adsorbed showed that the surface acids of γ-Al 2 O 3 and USY-free samples were mainly in the form of aprotic acids (L acids). The samples of ultra-stable Y zeolite (USY) and γ-Al 2 O 3 Acid (L acid) and protonic acid (B acid) are two types, also discussed the temperature during the desorption of the spectrum changes.