硅胶自环己烷中吸附含氧芳香化合物的研究

高等学校化学学报 ›› 1986, Vol. 7 ›› Issue (5): 453.

硅胶自环己烷中吸附含氧芳香化合物的研究

赵振国, 吴垠, 林垚

北京大学化学系

收稿日期:1984-12-25 出版日期:1986-05-24 发布日期:1986-05-24

The Adsorption of Oxy-Aromatic Compounds from Cyclohexane onto Silica Gel

Zhao Zhenguo, Wu Yin, Lin Yao

Department of Chemistry, Peking University, Beijing

Received:1984-12-25 Online:1986-05-24 Published:1986-05-24

摘要/Abstract

摘要： 测定了15℃和30℃时硅胶自环己烷中吸附苯甲醇、苯甲醚、苯甲醛和苯甲酸的吸附等温线,这些等温线皆可用Langmuir公式表示。利用Langmuir常数n_m^s和b值计算了吸附过程的△G⁰、△H⁰和△S⁰;四种化合物的△S⁰皆为正值。测定了在较大复盖度时红外光谱图上硅胶表面自由羟基峰的移动值△v_OH。结果表明△H⁰和△v_OH及△v_OH^1/2间有线性关系。文中对所得结果做了初步的解释。

Abstract: The adsorption isotherms for benzyl alcohol, anisole, benzaldehyde and benzoic acid on silica gel from cyclohexane have been measured at 15℃ and 30℃. The standard changes of free energy △G°, enthalpy △H° and entropy △S° in adsorption processes have been calculated from the Langmuir parameters. The results indicate that △S° is all positive. The shifts △VOHof the adsorption band of the stretching frequency of free hydroxyl groups on silica gel at high surface coverages were determined. The results show that △H⁰ is linear function of △v_OHor △v_OH^1/2.

TrendMD:

赵振国, 吴垠, 林垚. 硅胶自环己烷中吸附含氧芳香化合物的研究. 高等学校化学学报, 1986, 7(5): 453.

Zhao Zhenguo, Wu Yin, Lin Yao . The Adsorption of Oxy-Aromatic Compounds from Cyclohexane onto Silica Gel. Chem. J. Chinese Universities, 1986, 7(5): 453.