Our strategy is the creation of engineered nanochannels of various size and nature in zeolite-like cryst. compds. Dipeptide crystals contg. channels were used for the first time as hydrogen and methane nanocontainers. The unusual application of peptides as absorbitive materials for energetic purposes opens up novel perspectives in the choice of alternative families of substances for gas storage. A variety of combinations of dipeptide sequences can tune the cross-section of the channels and the microenvironment from narrow channels (3.7 Angstroms) that are suitable to hydrogen, to larger channels of about 5 Angstroms that can host favorably methane. In addn., toxic and contaminant gases such as carbon dioxide can be captured selectively resulting in the purifn. of methane in pipe-lines and of hydrogen before entering the fuel-cells. They are completely biodegradable, avoiding the generation of toxic wastes at the end of their life-cycle. Adsorption isotherms, XRD and MAS NMR provided the evidence of permanent porosity of the crystals and the structure stability after the gas has been totally removed. Moreover, the adsorption energy falls within the suggested limits for efficient loading/unloading performances. Much larger channels of more than 40 Angstrom cross-section were realized in hybrid org.-inorg. mesoporous materials with cryst. channel walls. The org. moieties could advantageously be functionalized to modulate the surface interactions. Furthermore, the discovery of fast mol. rotors with correlation times in the nanosecond regime lining the channel walls and exposed towards the diffusing-in gases allowed us to discuss adsorption properties together with host dynamics.
Sozzani, P., Distefano, G., Beretta, M., Valsesia, P. (2010). Hydrogen and methane storage in dipeptide crystals and highly organized hybrid mesoporous materials. Intervento presentato a: Pacifichem 2010, International Chemical Congress of Pacific Basin Societies, Honolulu.
Hydrogen and methane storage in dipeptide crystals and highly organized hybrid mesoporous materials
SOZZANI, PIERO ERNESTO;DISTEFANO, GAETANO;BERETTA, MARIO;VALSESIA, PATRIZIA
2010
Abstract
Our strategy is the creation of engineered nanochannels of various size and nature in zeolite-like cryst. compds. Dipeptide crystals contg. channels were used for the first time as hydrogen and methane nanocontainers. The unusual application of peptides as absorbitive materials for energetic purposes opens up novel perspectives in the choice of alternative families of substances for gas storage. A variety of combinations of dipeptide sequences can tune the cross-section of the channels and the microenvironment from narrow channels (3.7 Angstroms) that are suitable to hydrogen, to larger channels of about 5 Angstroms that can host favorably methane. In addn., toxic and contaminant gases such as carbon dioxide can be captured selectively resulting in the purifn. of methane in pipe-lines and of hydrogen before entering the fuel-cells. They are completely biodegradable, avoiding the generation of toxic wastes at the end of their life-cycle. Adsorption isotherms, XRD and MAS NMR provided the evidence of permanent porosity of the crystals and the structure stability after the gas has been totally removed. Moreover, the adsorption energy falls within the suggested limits for efficient loading/unloading performances. Much larger channels of more than 40 Angstrom cross-section were realized in hybrid org.-inorg. mesoporous materials with cryst. channel walls. The org. moieties could advantageously be functionalized to modulate the surface interactions. Furthermore, the discovery of fast mol. rotors with correlation times in the nanosecond regime lining the channel walls and exposed towards the diffusing-in gases allowed us to discuss adsorption properties together with host dynamics.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
