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Author(s): R. Afonso
A. Mendes
L. Gales
Title: Hydrophobic dipeptide crystals: A promising Ag-free class of ultramicroporous materials showing argon/oxygen adsorption selectivity
Issue Date: 2014
Abstract: The adsorption isotherms of nitrogen, oxygen and argon in four VA-class hydrophobic dipeptides arepresented. Isotherms were determined at 5, 20 and 35 1C, for a pressure range of 0-6 bar. Under theseconditions, adsorption is still in the Henry region. For all materials and temperatures, the sequenceof preferential adsorption is Ar 4 O2 4 N2, a highly abnormal result. At 5 1C, the dipeptide with thesmallest pores, VI, has Ar/O2 adsorption equilibrium selectivities up to 1.30, the highest ever measured inAg-free adsorbents. Gas uptakes, at 1 bar and 20 1C, are B0.05 mol kg1, very low relative values thatare partially explained by the low porosity of the solids (o10%). The significance of these results for thedevelopment of new materials for the process of O2 generation by pressure swing adsorption (PSA) isdiscussed. The results indicate some of the structural and chemical properties that prospective Ag-freeadsorbents should have in order to have Ar/O2 selectivity, hydrophobic pores, less than 0.5 nm-wide,and porosity of, at least, 20%.
Subject: Engenharia química, Engenharia química
Chemical engineering, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/114944/2009/Desenvolvimento de um sistema autorregenerativo para a remoção de CO2 de sistemas anestésicos em circuito fechado/PTDC/EQU-EQU/114944/2009
info:eu-repo/grantAgreement/Agência de Inovação, S.A./Projectos de I&DT em Co-Promoção/SI IDT - 13438/2010/High-Performance Oxygen Vacuum Pressure Swing Adsorption/HPOVPSA
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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