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本文用量热滴定法测定了NaY,NaHY和HY沸石的酸性。同时,对HY沸石分别用1N,3N与饱和NaCl溶液和0.1NNaOH溶液进行了处理,并用电位滴定法测定了其溶液的酸性。结果表明,正丁胺与NaHY沸石的相互作用包含有与质子酸的相互作用,与脱OH基中心间的作用,与残Na~+离子间的作用。Na~+离子交换HY沸石中的表面质子仅在强酸中心上进行。结果还表明,HY沸石的酸性与其说由Al(OH)_(3-x)~(x+)阳离子产生,还不如说是由其表面质子产生的。
In this paper, the thermal titration of NaY, NaHY and HY zeolites was investigated. At the same time, HY zeolite was treated with 1N, 3N and saturated NaCl solution and 0.1N NaOH solution, respectively, and the acidity of the solution was measured by potentiometric titration. The results show that the interaction between n-butylamine and NaHY zeolite includes the interaction with proton acid, the interaction with the center of dehydroxy group and the interaction with Na + ions. Surface protons in Na ~ + ion-exchanged HY zeolite are only carried out on strong acid sites. The results also show that the acidity of the HY zeolite is not so much produced by the surface protons as it is by the Al (OH) _ (3-x) ~ (x +) cations.