物理吸附
打赌理论
水银孔隙仪
单层
范德瓦尔斯力
材料科学
朗缪尔
化学工程
水溶液
朗缪尔吸附模型
活性炭
密度泛函理论
比表面积
热力学
纳米技术
催化作用
分子
化学
计算化学
物理化学
有机化学
吸附
多孔性
工程类
多孔介质
复合材料
物理
作者
Raoof Bardestani,Gregory S. Patience,Serge Kaliaguine
摘要
Abstract Gas physisorption is an experimental technique based on equilibrium Van der Waals interactions between gas molecules and solid particles, that quantifies the specific surface area (SSA), pore size distribution (PSD), and pore volume of solids and powders. The performance of catalysts, absorbents, chromatography column materials, and polymer resins depends on these morphological properties. Here we introduce the basic principles and procedures of physical adsorption, especially nitrogen physisorption, as a guide to students and researchers unfamiliar with the field. The Brunauer‐Emmett‐Teller theory (BET) is a common approach to estimate SSA that extends the Langmuir monolayer molecular adsorption model to multilayer layers. It relies on an equilibrium adsorption isotherm, measured at the normal boiling point of the adsorbate, eg, 77 K or 87 K for N 2 and Ar, respectively. Web of Science indexed 45 400 articles in 2016 and 2017 that mentioned N 2 adsorption porosimetry—BET and BJH (Barrett‐Joyner‐Halenda) keywords. The VOSViewer bibliometric tool grouped these articles into four research clusters: adsorption, activated carbon in aqueous solutions for removal of heavy metal ions; synthesis of nanoparticles and composites; catalysts performance in oxidation and reduction processes; and photocatalytic degradation with TiO 2 . According to the literature, the accuracy of the density function theory (DFT) method is higher than with the BJH theory and it is more reliable.
科研通智能强力驱动
Strongly Powered by AbleSci AI