Carbonaceous porous materials derived from leather skin residues have been found to have excellent CO adsorption properties, with interestingly high gas selectivities for CO (α > 200 at a gas composition of 15% CO/85% N, 273K, 1 bar) and capacities (>2 mmol·g at 273 K). Both CO isotherms and the high heat of adsorption pointed to the presence of strong binding sites for CO which may be correlated with both: N content in the leather residues and ultrasmall pore sizes.
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