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(a) N2 adsorption–desorption isotherms of NPOP-1 and NPOP-2 at 77 K. CO2 adsorption–desorption isotherms, at 273 K and 298 K, of: (b) NPOP-1, (c) NPOP-2, and (d) isosteric heats of CO2 adsorption of NPOP-1 and NPOP-2 calculated with the virial method.
