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Keywords = surface characteristic parameter
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12 pages, 476 KB  
Article
Role of the Number of Adsorption Sites and Adsorption Dynamics of Diffusing Particles in a Confined Liquid with Langmuir Kinetics
by Renato F. de Souza, Roberta R. Ribeiro de Almeida, Eric K. Omori, Rodolfo T. de Souza, Ervin K. Lenzi, Luiz R. Evangelista and Rafael S. Zola
Physchem 2023, 3(1), 1-12; https://doi.org/10.3390/physchem3010001 - 20 Dec 2022
Cited by 2 | Viewed by 2745
Abstract
In this work, we investigate the effect of the number of available adsorption sites for diffusing particles in a liquid confined between walls where the adsorption (desorption) phenomena occur. We formulate and numerically solve a model for particles governed by Fickian’s law of [...] Read more.
In this work, we investigate the effect of the number of available adsorption sites for diffusing particles in a liquid confined between walls where the adsorption (desorption) phenomena occur. We formulate and numerically solve a model for particles governed by Fickian’s law of diffusion, where the dynamics at the surfaces obey the Langmuir kinetic equation. The ratio between the available number of adsorption sites and the number of total particles are used as a control parameter. The investigation is carried out in terms of characteristic times of the system for different initial configurations, as well as the cases of identical or non-identical surfaces. We calculate the bulk and surface densities dynamics, as well as the variance of the system, and demonstrate that the number of sites affects the bulk, surface distributions, and diffusive regimes. Full article
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21 pages, 3566 KB  
Review
Adsorption Factors in Enhanced Coal Bed Methane Recovery: A Review
by Theodora Noely Tambaria, Yuichi Sugai and Ronald Nguele
Gases 2022, 2(1), 1-21; https://doi.org/10.3390/gases2010001 - 14 Jan 2022
Cited by 27 | Viewed by 9379
Abstract
Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and [...] Read more.
Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and modeling have been used to assess gas adsorption and its effects, including volumetric and gravimetric techniques, as well as the Ono–Kondo model and other numerical simulations. Thermodynamic parameters may be used to model adsorption on coal surfaces while adsorption isotherms can be used to predict adsorption on coal pores. In addition, density functional theory and grand canonical Monte Carlo methods may be employed. Complementary analytical techniques include Fourier transform infrared, Raman spectroscopy, XR diffraction, and 13C nuclear magnetic resonance spectroscopy. This review summarizes the cutting-edge research concerning the adsorption of CO2, N2, or mixture gas onto coal surfaces and into coal pores based on both experimental studies and simulations. Full article
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