反相气相色谱法研究改性活性炭对甲烷吸附热的影响

摘要

采用反相气相色谱技术(IGC)测定了甲烷分子在改性前后活性炭上的保留时间,计算出了改性前后的活性炭的表面吸附热变化,并对不同改性剂的改性效果进行了比较.结果表明,改性前活性炭吸附热为17.75 mol/L,改性后的活性炭吸附热分别为18.74(氧化改性)、18.96(还原改性)、18.43 mol/L(盐改性).改性前后活性炭吸附热有微小变化,采用IGC技术可以准确予以表征.%Inverse gas chromatography(IGC)was applied to measure the retention time of methane molecules on activated carbon before and after modification to calculate the variation of the adsorption heat of methane on the surface of the activated carbon before and after modification.The modification effects of different modifiers were also compared.Compared with the adsorption heat of unmodified activated carbon(17.75 mol/L).the adsorption heat of methane on modified activated carbons were 18.74(oxidative modification),18.96(reduction modification)and 18.43 mol/L (salt modification),respectivly. The results indicated that the adsorption heat of activated carbon had slightly changed before and after modification which cold be accurately characterized by ICC.