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作者曾建立了改进的简化氮吸附比表面测定仪,并有广泛应用。这个装置沿用单点吸附法。在本工作中,研究制定了进行连续逐次多点吸附的实验方法和计算方法。对许多种粉末样品,作出的BET吸附等温线的直线性良好。对不同P/P_s下的单点法结果与多点法结果之间的误差与试样的C值的关系作了系统的研究,为单点法或多点法的选用提供了依据。所测大多数粉末的C值都足够大、表明可用单点法;个别种类的粉末C值小于50,须用多点法。此外,结果表明,在这类简化装置上还可进行其它关于多点吸附的研究。
The authors have established an improved simplified nitrogen adsorption surface area analyzer, and has been widely used. This device follows the single-point adsorption method. In this work, the study developed a continuous sequential multi-point adsorption experimental method and calculation method. For many powder samples, the linearity of the BET adsorption isotherms was good. The relationship between the error between single-point method and multi-point method under different P / P_s and the C value of the sample was systematically studied, which provided the basis for the selection of single-point method or multi-point method. Most of the measured powder C values are large enough, indicating that single-point method available; individual types of powder C value of less than 50, to be used multi-point method. In addition, the results show that other studies on multi-site adsorption can also be performed on such simplified devices.