多孔介质孔隙吸附填充过程与团簇演化机制研究  

Study on Pore Filling Process and Cluster Evolution Mechanism of Adsorption on Porous Materials

作　　者：张威[1] 吴春梅[1] 涂为 李友荣[1] ZHANG Wei;WU Chunmei;TU Wei;LI Yourong(Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education,School of Energy and Power Engineering,Chongqing University,Chongqing 400030,China)

机构地区：[1]重庆大学低品位能源利用技术及系统教育部重点实验室,能源与动力工程学院,重庆400044

出　　处：《工程热物理学报》2024年第12期3587-3593,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51876012);重庆市自然科学基金(No.CSTB2024NSCQ-MSX1065)。

摘　　要：为了探讨不同孔径材料的吸附特性与微孔填充过程,采用实验测试与理论分析相结合的方法研究了二氧化硅–氮气吸附过程中的孔隙吸附特性。通过对无孔材料吸附等温线进行热力学分析得到材料真实的Zeta吸附等温参数,发现在低压比区域吸附熵先急剧增大,再减小至一极点后增大,摩尔潜热在此范围内为负值,吸附质为不稳定状态,确定了微孔填充过程的压比范围。利用对应体系的Zeta等温参数明确了介孔二氧化硅材料孔隙填充过程开始时的压比和对应的团簇大小,发现团簇分子与孔径关系比例系数随着孔径的增大而减小,提出了考虑孔隙壁面弯曲效应的孔隙填充过程物理模型。In order to study the adsorption characteristics of materials with different pore sizes and microporous filling process,the pore adsorption during silicon-N2 adsorption was investigated using a combination of experimental and theoretical methods.The thermodynamic analysis of the adsorption isotherms of the nonporous materials was used to obtain the true Zeta adsorption isother-mal constants of the materials,and it was found that the entropy of adsorption in the range of low pressure ratios first increased sharply and then decreased,and then began to increase again after reaching a pole.The molar latent heat is negative in this range,indicating the instability of the adsorbent at this time,from which the unstable interval determines the pressure ratio range of the microporous filling process.The pressure ratio and the corresponding cluster size at the beginning of the pore flling process of mesoporous silica materials were determined using the Zeta isothermal constant of the corresponding system.The cluster molecules were analyzed in relation to the pore size,and the scaling factor decreased with the increase of the pore size,and a physical model was proposed for the earlier merging of clusters at the adsorption sites due to the wall bending of the pores to start the pore filling process.

关 键 词：微孔填充 Zeta吸附理论 吸附熵 孔隙填充 团簇 

分 类 号：TK123[动力工程及工程热物理—工程热物理]