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用连续脱附和热脱附色谱法测定不同固体吸附苯和氮的等温线;考察了Jovanovic多分子层吸附等温方程计算固体比表面的适用性。结果证明,根据lnV(x)=lnV_m+bx方程(式中X=P/P_n为相对压力),在X为0.25—0.50范围内,以lnV(x)对X作图可得直线;由图获得单层吸附量V_m和比表面Sg,与其他方法比较,其结果一致。在测定固体孔结构参数的同时,由获得的全程吸附等温线,用本法可简便、快速地计算其比表面参数。
The isotherms of benzene and nitrogen adsorbed by different solids were determined by continuous desorption and thermal desorption chromatography. The applicability of the Jovanovic multi-layer adsorption isotherm equation to calculate the solid specific surface area was investigated. The results show that according to the equation lnV (x) = lnV_m + bx (where X = P / P_n is the relative pressure), a straight line can be obtained by plotting lnV (x) on X in the range of 0.25-0.50 for X; Obtained monolayer adsorption V_m and specific surface Sg, compared with other methods, the results are consistent. In the determination of solid pore structure parameters at the same time, obtained by the full adsorption isotherm, with this method can be easily and quickly calculate the specific surface parameters.