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研究各种 ZSM-5沸石样品的红外光谱发现:在1875和2000cm~(-1)附近有两个强红外吸收谱带,两个谱带吸光度的比值是个特征值。本文提出了以2000cm~(-1)谱带为“内标”,用相对吸光度的办法处理 ZSM-5沸石的红外光谱,测定了各种改性ZSM-5 样品的 Br(?)nsted 酸,并同电位滴定法所测得的 Br(?)nsted 酸浓度和异丙苯裂解活性分别关联,都有较好的对应关系。文中以实验为依据讨论了1875和2000cm~(-1)谱带的归属,并根据 Beer-Lambert 定律,推导出了相对吸光度与浓度的关系,从而确立了 ZSM-5沸石上红外光谱定量处理方法的理论基础。
The infrared spectra of various samples of ZSM-5 zeolite were studied. There are two strong infrared absorption bands around 1875 and 2000 cm -1, and the ratio of the absorbance of two bands is a characteristic value. In this paper, the infrared spectroscopy of ZSM-5 zeolite with 2000cm -1 band as the “internal standard” and the relative absorbance of ZSM-5 zeolite were proposed. Br (?) Nsted acid of various modified ZSM- And with potentiometric titration measured Br (?) Nsted acid concentration and cumene cracking activity were associated, there is a good correspondence between. In this paper, we discuss the attribution of 1875 and 2000cm -1 bands on the basis of experiments and deduce the relationship between relative absorbance and concentration according to the Beer-Lambert law, thus establishing a quantitative method for the quantitative determination of ZSM-5 zeolite by IR spectra The theoretical basis.