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通过热解聚偏氟乙烯(PVDF)一步法制备微孔炭,并借助N_2吸脱附、XRD等对其结构进行表征,利用磁悬浮天平测量了甲烷(CH_4)/氮气(N_2)的吸附等温线,并进行Langmuir和Freundlich拟合,并由Henry常数预测CH_4/N_2的分离因子。结果表明:吸附等温模型拟合效果较好,当温度为45℃,分离因子为4.59,有较好的分离效果;对吸附热力学进行研究表明CH_4的吸附热大于N_2,说明吸附剂对CH_4的吸附作用力大于N_2,且相对分子筛类吸附剂吸附热较小,易于吸附剂的再生。
The microporous carbon was prepared by one-step pyrolytic PVDF process. The structure was characterized by N 2 adsorption and desorption and XRD. The adsorption isotherms of methane (CH 4) / nitrogen (N 2) were measured by magnetic levitation balance , And fitted by Langmuir and Freundlich. The Henry constant was used to predict the separation factor of CH 4 / N 2. The results showed that the adsorption isotherm model has a good fitting effect. When the temperature is 45 ℃ and the separation factor is 4.59, the separation effect is better. The study of adsorption thermodynamics shows that the adsorption heat of CH 4 is larger than N 2, indicating that the adsorbent adsorbs CH 4 Forces greater than N_2, and the relative molecular sieve adsorbent heat of adsorption is small, easy to regenerate the adsorbent.