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化学学报
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化学学报 ›› 1988, Vol. 46 ›› Issue (1): 49-52. 上一篇    下一篇

研究论文

气相色谱吸附过程的热力学函数变化及规律探讨 II: 吸附熵变的计算方程与硅胶对直链烷的吸附

蔡显鄂;邓海滨;朱京   

  1. 复旦大学化学系
  • 发布日期:1988-01-15

Study of thermodynamics functions and their interrelationships in gas chromatographic process II: Discussion about equations for calculating in entropy of adsorption of alkanes on silica gel

CAI XIANE;DENG HAIBIN;ZHU JING   

  • Published:1988-01-15

PDF

513

被引次数

8

本文从吸附平衡的定义导出一个较为合理的方程, 并据此计算了9个有机化合物在硅胶表面吸附过程的焓变和熵变, 所得结果进一步验证了热力学补偿效应、同系物碳数关系和等热力学等规律.

关键词: 计算, 气相色谱, 吸附平衡, 热力学函数, 熵, 硅胶, 吸附方程

An equation for calculating changes in entropy and enthalpy of adsorption was derived from the adsorption equilibrium constant: ln V癵 = -DH?RTc + [DS?R + ln(RT273S)]. The thermodn. parameters (DH? DS? DG? and ln K of adsorption of some alkanes and C6H6 on silica gel were calculated The results show that the contributions of 1 mol of CH2 groups to DH? DS? and DG?98 of adsorption were -4.4 kJ/mol, -5.9 kJ/mol.K, AND -2.7 kJ/mol, resp. An isothermodynamic point and a thermodn. compensation effect were also found as in the case of Porapaks reported previously.

Key words: CALCULATION, GAS CHROMATOGRAPHY, ABSORPTION EQUILIBRIUM, THERMODYNAMIC FUNCTION, ENTROPY, SILICA GEL, ADSORPTION EQUATION

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