吸液驱气法对微孔材料的表征

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黄一惟,徐绍平,李文哲.吸液驱气法对微孔材料的表征[J].,2019,59(6):551-558

吸液驱气法对微孔材料的表征

Characterization of microporous materials by spontaneous liquid-gas imbibition

DOI：10.7511/dllgxb201906001

中文关键词:微孔材料吸液驱气孔隙结构表面性质

英文关键词:microporous materials spontaneous liquid-gas imbibition pore structure surface property

基金项目:国家自然科学基金资助项目(21376046).

作者	单位
黄一惟,徐绍平,李文哲

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中文摘要:

为了提供一种高效描述多孔材料的方式，以水和乙醇为液体探针，N2、O2和CO2为气体探针，在303 K和常压下研究了3种吸附剂(AC、CMS和ZSM)的吸液驱气行为．引入一种描述微孔吸附剂吸液驱气过程的动力学模型去拟合吸液驱气曲线，用于提取定量化信息．结果表明，吸液驱气法对于吸附剂、液体探针以及气体探针的改变十分敏锐．气体驱替量随着时间推移变化的曲线与吸附剂的孔隙结构和表面性质关系密切，同时也与涉及的液体和气体探针的性质有关．吸液驱气曲线能够通过平衡驱气量Ve提供微孔容积和吸附质气体密度的相关信息，通过微孔扩散速率系数k1指示微孔和流体探针分子尺寸的相对大小以及气体分子的吸附状态．吸液驱气曲线还能够反映吸附剂孔径分布的均一性、液体探针与吸附剂的亲和性以及气体探针分子在吸附剂微孔内的吸附密度．

英文摘要:

In order to provide an efficient way to characterize porous materials, with H2O and C2H5OH as liquid probes, N2, O2 and CO2 as gas probes, spontaneous liquid-gas imbibition (SLGI) behavior of three adsorbents (i.e. AC, CMS and ZSM) under 303 K and ambient pressure was investigated. A kinetic model for describing SLGI process of microporous adsorbents was introduced to fit the SLGI curves for extracting quantitative information. The results indicate that SLGI experiment is sensitive to the variation of adsorbents, liquid probes and gas probes. The gas recovery over time is closely related to the pore structure and surface properties of the adsorbent, as well as the properties of the gas and liquid probes involved. SLGI curves give information related to the micropore volume and the density of the adsorbed gas reflected in equilibrium gas recovery volume Ve, the relative size of the micropore and the fluid probes as well as the gas adsorption state revealed by microporous diffusion rate coefficient k1, and it could also reflect the pore size distribution uniformity of the adsorbent, the affinity between the adsorbent and the liquid probe as well as the adsorption density of the gas probe in micropores of the adsorbent.

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吸液驱气法对微孔材料的表征

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