基于活性炭吸脱附测试的杜比宁吸附方程修正表达式
Modified Expression of Dubinin-Radushkevich Equation Based on Adsorption and Desorption Tests of Activated Carbon
投稿时间:2018-10-22  修订日期:2019-10-17
DOI:10.11908/j.issn.0253-374x.2019.12.013     稿件编号:    中图分类号:TU83
 
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中文摘要
      现有研究证明杜比宁吸附方程(D-R方程)在高相对压力区 (2.59<[ln(p0/P)]2<10),存在较为明显的欠拟合问题(P为气体的平衡压力,p0为实验温度下的饱和蒸汽压).基于此提出了活性炭材料在2.59<[ln(p0/P)]2<10范围内的D-R方程的修正表达式,并通过活性炭吸脱附测试获取了3种活性炭在不同相对压力下的氮气吸附量,对实验数据进行分段拟合.拟合结果表明,在2.59<[ln(p0/P)]2<10范围,所提出的修正表达式拟合精度高于直接使用D-R方程.
英文摘要
      Previous studies showed that Dubinin-Radushkevich equation (D-R equation) does not describe the microporous adsorption well in the partial region of 2.59<[ln(p0/P)]2<10 (P is the balance pressure of adsorbate, p0 is the saturated vapor pressure at the experiment temperature). A modified expression of D-R equation is proposed herein for activated carbon materials in the range of 2.59<[ln(p0/P)]2<10. The adsorption capacity of the three activated carbon adsorbents at different relative pressures was tested with adsorption and desorption experiments, and the experimental data were fitted using proposed equations and original D-R equation. Results showed that in the range of 2.59<[ln(p0/P)]2<10, the proposed equations can describe microporous adsorption more accurately than the original D-R formula.
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