Equilibrium and Kinetics of Water Adsorption in Carbon Molecular Sieve:  Theory and Experiment

Langmuir ◽  
2004 ◽  
Vol 20 (20) ◽  
pp. 8681-8687 ◽  
Author(s):  
S. W. Rutherford ◽  
J. E. Coons
Keyword(s):  
Molecular Sieve ◽  
Water Adsorption ◽  
Carbon Molecular Sieve ◽  
Sieve Theory ◽  
Equilibrium And Kinetics ◽  
Kinetics Of ◽  
Theory And Experiment

Adsorption Equilibrium and Kinetics of Methane and Nitrogen on Carbon Molecular Sieve

2014 ◽  
Vol 53 (43) ◽  
pp. 16840-16850 ◽  
Author(s):  
Ying Yang ◽  
Ana M. Ribeiro ◽  
Ping Li ◽  
Jian-Guo Yu ◽  
Alirio E. Rodrigues
Keyword(s):  
Molecular Sieve ◽  
Adsorption Equilibrium ◽  
Carbon Molecular Sieve ◽  
Equilibrium And Kinetics ◽  
Adsorption Equilibrium And Kinetics ◽  
Kinetics Of

Adsorption Equilibrium and Kinetics of Branched Octane Isomers on a Polyvinylidene Chloride-Based Carbon Molecular Sieve

2008 ◽  
Vol 22 (4) ◽  
pp. 2641-2648 ◽  
Author(s):  
Georgina C. Laredo ◽  
Edith Meneses ◽  
Jesús Castillo ◽  
Jesús O. Marroquin ◽  
Federico Jiménez-Cruz
Keyword(s):  
Molecular Sieve ◽  
Adsorption Equilibrium ◽  
Carbon Molecular Sieve ◽  
Polyvinylidene Chloride ◽  
Equilibrium And Kinetics ◽  
Adsorption Equilibrium And Kinetics ◽  
Octane Isomers ◽  
Kinetics Of

Equilibrium and Kinetics of Methane and Ethane Adsorption in Carbon Molecular Sieve

2016 ◽  
Vol 14 (4) ◽  
pp. 887-898 ◽  
Author(s):  
Babak Shirani ◽  
Mladen Eic
Keyword(s):  
Molecular Sieve ◽  
Surface Barrier ◽  
Diffusion Resistance ◽  
Carbon Molecular Sieve ◽  
Transfer Rates ◽  
Equilibrium And Kinetics ◽  
Different Temperatures ◽  
Uptake Data ◽  
Barrier Resistance ◽  
Kinetics Of

Abstract The comprehensive study involving uptake and kinetics behaviour of methane and ethane was carried out on a commercial carbon molecular sieve. The gravimetric technique was applied to measure the adsorption isotherms at different temperatures. The kinetic behaviours of methane and ethane were investigated by extracting the uptake data from isotherms at different pressure steps. Considering CMS as a homogenous microporous adsorbent, only two main resistances: surface barrier (at the pore mouth) and diffusion resistance (inside the pores) were considered in analysing the kinetic data. The kinetic analysis showed dominance of surface barrier resistance at all temperatures and pressures investigated in this study. Modified Darken equation was used to calculate the sorbates’ activation energies for adsorption in CMS pores. Compared to Darken equation, the modified Darken model predicted the concentration dependency of the surface rate constants more accurately, especially at higher sorbates’ concentrations. The activation energy of methane and ethane was greater than the heat of adsorption demonstrating a large impedance and barrier at the pore surface to the methane and ethane molecules. The kinetic selectivity of methane over ethane was calculated from the combined surface barrier/diffusion model parametric analysis. The results generally showed a greater selectivity to methane over ethane, i. e., the higher mass transfer rates.

scholarly journals Water Adsorption Effect on Carbon Molecular Sieve Membranes in H2-CH4 Mixture at High Pressure

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3577
Author(s):  
Maria L. V. Nordio ◽  
José A. Medrano ◽  
Martin van Sint Annaland ◽  
David Alfredo Pacheco Tanaka ◽  
Margot Llosa Tanco ◽  
...  
Keyword(s):  
High Pressure ◽  
Molecular Sieve ◽  
Water Adsorption ◽  
High Pressures ◽  
Operating Conditions ◽  
Raw Material ◽  
Carbon Molecular Sieve ◽  
Adsorption Effect ◽  
Palladium Membranes ◽  
Different Temperatures

Carbon molecular sieve membranes (CMSMs) are emerging as promising solution to overcome the drawbacks of Pd-based membranes for H2 separation since (i) they are relatively easy to manufacture; (ii) they have low production and raw material costs; (iii) and they can work at conditions where polymeric and palladium membranes are not stable. In this work CMSMs have been investigated in pure gas and gas mixture tests for a proper understanding of the permeation mechanism, selectivity and purity towards hydrogen. No mass transfer limitations have been observed with these membranes, which represents an important advantage compared to Pd-Ag membranes, which suffer from concentration polarization especially at high pressure and low hydrogen concentrations. H2, CH4, CO2 and N2 permeation at high pressures and different temperatures in presence of dry and humidified stream (from ambient and water vapour) have been carried out to investigate the effect of the presence of water in the feed stream. Diffusion is the main mechanism observed for hydrogen, while methane, nitrogen and especially carbon dioxide permeate through adsorption-diffusion at low temperatures and high pressures. Finally, H2 permeation from H2-CH4 mixtures in presence of water has been compared at different temperatures and pressure, which demonstrates that water adsorption is an essential parameter to improve the performance of carbon molecular sieve membranes, especially when working at high temperature. Indeed, a hydrogen purity of 98.95% from 10% H2—90% CH4 was achieved. The main aim of this work is to understand the permeation mechanisms of CMSMs in different operating conditions and find the best conditions to optimize the separation of hydrogen.

Adsorption equilibria and kinetics of CO2, CO, and N2 on carbon molecular sieve

2019 ◽  
Vol 212 ◽  
pp. 952-964 ◽  
Author(s):  
Yongha Park ◽  
Dong-Kyu Moon ◽  
Dooyong Park ◽  
Masoud Mofarahi ◽  
Chang-Ha Lee
Keyword(s):  
Molecular Sieve ◽  
Carbon Molecular Sieve ◽  
Adsorption Equilibria ◽  
Kinetics Of

Equilibrium and kinetics of adsorption of high molecular weight n-paraffins on a calcium LTA molecular sieve

Adsorption ◽  
2016 ◽  
Vol 23 (2-3) ◽  
pp. 257-269 ◽  
Author(s):  
V. I. Águeda ◽  
M. A. Uguina ◽  
J. A. Delgado ◽  
M. T. Holik ◽  
D. Aranda ◽  
...  
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Molecular Sieve ◽  
Kinetics Of Adsorption ◽  
Equilibrium And Kinetics ◽  
Kinetics Of
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