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Single and Multicomponent Sorption of CO2, CH4 and N2 in a Microporous Metal-Organic Framework

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Abstract:

Single and multicomponent fixed-bed adsorption of CO2, N2, and CH4 on crystals of MOF-508b has been studied in this work. Adsorption equilibrium was measured at temperatures ranging from 303 to 343 K and partial pressures up to 4.5 bar. MOF-508b is very selective for CO2 and the loadings of CH4 and N2 are practically temperature independent. The Langmuir isotherm model provides a good representation of the equilibrium data. A dynamic model based on the LDF approximation for the mass transfer has been used to describe with good accuracy the adsorption kinetics of single, binary and ternary breakthrough curves. It was found that the intra-crystalline diffusivity for CO2 is one order of magnitude faster than for CH4 and N2.

Keywords: CO2 separation; dynamic; dynamic simulation; fixed bed; metal-organic framework; multi-component adsorption; natural gas

Document Type: Research Article

DOI: https://doi.org/10.1080/01496390802282347

Affiliations: 1: Escola Superior de Tecnologia e Gestao, Instituto Politecnico de Braganca, Braganca, Portugal 2: Department of Chemistry, University of Texas-Pan American, Edinburg, TX, USA 3: Laboratory of Separation and Reaction Engineering, Departamento de Engenharia Quimica, Faculdade de Engenharia, Universidade do Porto, Porto, Portugal

Publication date: 2008-01-01

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