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测过了吡啶、己烯和1,5-己二烯在NaY,CaY,HY和 USY等沸石上的微分吸附热和相应的红外谱图。结果表明,烯烃吸附热的大小是由沸石表面酸中心的性质和吸附质分子的性质共同决定的。沸石表面的酸性强,气体分子中的活性部位(如双键)多,则吸附热大。当1,5-己二烯吸附时,吸附分子可以占据两个活性中心,分步打开两个或一个双键。通过分子内或分子间的活化,发生异构或聚合反应。因此,吸附初始阶段的量热曲线上出现双峰,整个微分吸附热曲线呈波浪状。
The differential heats of adsorption of pyridine, hexene and 1,5-hexadiene on zeolites such as NaY, CaY, HY and USY and the corresponding infrared spectra were measured. The results show that the size of the heat of olefin adsorption is determined by the nature of the zeolite acid sites and the nature of the adsorbate molecules. Zeolite surface acidity, gas molecules in the active site (such as double bonds) and more, then the adsorption heat. When 1,5-hexadiene is adsorbed, the adsorbed molecules can occupy two active sites, opening up two or one double bonds in stages. By intramolecular or intermolecular activation, isomerisation or polymerization occurs. Therefore, the initial stage of adsorption calorimetry curves appear double peaks, the entire differential adsorption heat wave was wavy.