Dipeptide crystalline materials are proposed for the absorption of environmentally and energetically relevant gases such as carbon dioxide, methane and hydrogen. The crystalline scaffolds, held together by a network of hydrogen bonds, of L-alanyl-L-valine (AV), L-valyl-L-alanine (VA), L-isoleucyl-L-valine (IV) and L-valyl-L-isoleucine (VI) form stable nanochannel pores with internal hydrophobic surfaces and suitable cross-section that encapsulates, efficiently and selectively, guest gases. The soft nature of the interactions guarantees reversibility of the process and triggered delivery simply by reducing gas pressure. With L-isoleucyl-L-valine, showing small channel diameter (3.9 Å), at 195K and already at 250 torr CO2 absorption reaches the value of 53 cm3 (STP) g_1 (90% maximum loading). We were able to attain remarkable CO2/CH4 selectivity even at atmospheric pressure, supporting the idea that this crystalline powder can find application in methane purification from carbon dioxide. Hydrogen showed a particular affinity for the IV and VI as shown by the adsorption isotherms run up to 10 atm and 77K. The type I Langmuir profile at 77 K reached maximum loading already at pressures close to 1 atm, and an absorption capacity of 52 cm3 (STP) g-1 for IV that corresponds to 0.5 mol/mol.

Comotti, A., Bracco, S., Distefano, G., & Sozzani, P. (2009). Methane, carbon dioxide and hydrogen storage in nanoporous dipeptide-based materials. CHEMICAL COMMUNICATIONS, 2009(3), 284-286 [10.1039/b820200a].

Methane, carbon dioxide and hydrogen storage in nanoporous dipeptide-based materials

COMOTTI, ANGIOLINA;BRACCO, SILVIA;DISTEFANO, GAETANO;SOZZANI, PIERO ERNESTO
2009

Abstract

Dipeptide crystalline materials are proposed for the absorption of environmentally and energetically relevant gases such as carbon dioxide, methane and hydrogen. The crystalline scaffolds, held together by a network of hydrogen bonds, of L-alanyl-L-valine (AV), L-valyl-L-alanine (VA), L-isoleucyl-L-valine (IV) and L-valyl-L-isoleucine (VI) form stable nanochannel pores with internal hydrophobic surfaces and suitable cross-section that encapsulates, efficiently and selectively, guest gases. The soft nature of the interactions guarantees reversibility of the process and triggered delivery simply by reducing gas pressure. With L-isoleucyl-L-valine, showing small channel diameter (3.9 Å), at 195K and already at 250 torr CO2 absorption reaches the value of 53 cm3 (STP) g_1 (90% maximum loading). We were able to attain remarkable CO2/CH4 selectivity even at atmospheric pressure, supporting the idea that this crystalline powder can find application in methane purification from carbon dioxide. Hydrogen showed a particular affinity for the IV and VI as shown by the adsorption isotherms run up to 10 atm and 77K. The type I Langmuir profile at 77 K reached maximum loading already at pressures close to 1 atm, and an absorption capacity of 52 cm3 (STP) g-1 for IV that corresponds to 0.5 mol/mol.
Articolo in rivista - Articolo scientifico
Porous crystals, dipeptide-based materials, selective absorption, carbon dioxide, methane, hydrogen, nanochannels, permanent porosity, energy, environment
English
Comotti, A., Bracco, S., Distefano, G., & Sozzani, P. (2009). Methane, carbon dioxide and hydrogen storage in nanoporous dipeptide-based materials. CHEMICAL COMMUNICATIONS, 2009(3), 284-286 [10.1039/b820200a].
Comotti, A; Bracco, S; Distefano, G; Sozzani, P
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/6401
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