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应用红外光谱研究了异己烷、正己烷、己烯-1、环己烯、苯等碳六烃在Y沸石表面的吸附过程。发现烃吸附后,超笼羟基消失;不饱和烃吸附后,同时还在3400—3000cm~(-1)区出现一个峰巅频率不同的大峰包,系烃类的离域π电子与表面羟基作用形成氢键的结果。小笼羟基程度不等地向低频位移,这些作用随不饱和烃π键增强而加剧。小笼羟基强度有增强的现象,这可能是由于吸附的烃类使超笼羟基指向小笼或质子迁移所引起。小笼羟基增强程度与烃的H/C比、烃吸附量及烃结构有明显的依赖关系。
The adsorption process of isohexane, n-hexane, hexene-1, cyclohexene and benzene on the Y zeolites was studied by infrared spectroscopy. After the adsorption of unsaturated hydrocarbons, the hydroxyl groups of the supercages disappeared. After the adsorption of unsaturated hydrocarbons, a large peak with different peak frequencies appeared in the region of 3400-3000 cm -1, and the delocalized π electrons of the hydrocarbons formed with the surface hydroxyl groups The result of hydrogen bonding. The degree of hydroxyl groups in the cages shifts to low frequencies, and these effects are exacerbated with the increase of unsaturated bond π bond. The increase in the hydroxyl group of the cages may be due to the adsorption of hydrocarbons that cause the hypercoupling of hydroxyls to the cages or the migration of protons. The degree of hydroxyl group enhancement in the cages is obviously dependent on the H / C ratio, the hydrocarbon adsorption capacity and the hydrocarbon structure.