Thermodynamics of Adsorption in Porous Materials
نویسنده
چکیده
Thermodynamic equations are de®eloped for adsorption of multicomponent gas mixtures in microporous adsorbents based on the principles of solution thermodynamics. The con®entional spreading pressure and surface area ®ariables, which describe 2-D films, must be abandoned for adsorption in micropores, in which spreading pressure cannot be measured experimentally or calculated from intermolecular forces. Adsorp( ) ( ) tion is di®ided into two steps: 1 isothermal compression of the gas, 2 isothermal ( immersion of clean adsorbent in the compressed gas. Thermodynamic functions Gibbs ) free energy, enthalpy, and entropy from solution thermodynamics pro®ide a complete thermodynamic description of the system. Applications are described for characterization of adsorbents, gas storage at high pressure, mixture adsorption, enthalpy balances, molecular simulation, adsorption calorimetry, and shape selecti®ity in catalysis.
منابع مشابه
Adsorption in Porous Materials at High Pressure: Theory and Experiment
We consider the thermodynamics of adsorption of gases in porous solids from both the perspective of absolute properties which appear naturally in theoretical studies and that of excess properties which are measured in experiments. Our thermodynamic description starts by treating the gas (or gas mixture) plus porous solid system as a mixture to which we can apply solution thermodynamics. We show...
متن کاملInfluence of elastic deformation of porous materials in adsorption-desorption process. A thermodynamic approach
متن کامل
Aging and response properties in the parking-lot model
An adsorption-desorption (or parking-lot) model can reproduce qualitatively the densification kinetics and other features of a weakly vibrated granular material. Here we study the the two-time correlation and response functions of the model and demonstrate that their behavior is consistent with recently observed memory effects in granular materials. Although the densification kinetics and hyste...
متن کاملThermodynamic methods and models to study flexible metal-organic frameworks.
Much attention has recently been focused on a fascinating subclass of metal-organic frameworks that behave in a remarkable stimuli-responsive fashion. These soft porous crystals feature dynamic crystalline frameworks displaying reversible, large-amplitude structural deformations under external physical constraints such as temperature, electric field or gas exposure. The number of reported synth...
متن کاملWater Adsorption in Flexible Gallium-Based MIL-53 Metal−Organic Framework
Understanding the adsorption of water in metal−organic frameworks (MOF), and particularly in soft porous crystals, is a crucial prerequisite before considering MOFs for industrial applications. We report here a joint experimental and theoretical study on the behavior of a gallium-based breathing MOF, Ga-MIL-53, upon water adsorption. By looking at the energetics and thermodynamics of Ga-MIL-53,...
متن کامل