With concerns over global warming, the removal and storage of carbon dioxide from the air is a topic receiving significant attention. Novel materials are continuously being synthesized to improve the efficiency of CO2 removal from power plant stacks and other sources of this greenhouse gas. Determination of the pore volume and pore size is routinely performed with nitrogen adsorption at 77K, argon adsorption at 87K, or carbon dioxide adsorption at 273K. The latter is the preferred method for pore size analysis of carbons, however, low pressure analyzers can only detect pores in the micropore region (<2nm). Use of a high pressure gas sorption analyzer, like the iSorbHP allows CO2 isotherms to be acquired at 273K up to the saturation pressure of CO2 (~35bar), enabling the characterization of both micro- and mesopores.
Relevant Tech Notes:
#40 - Application of QSDFT (quenched solid density functional theory) - a novel density functional theory for an accurate pore size analysis of disordered porous carbons.
#52 - Adsorptives for Physisorption Experiments: Selection and their Properties.
#53 - Application of Quenched Solid Density Functional Theory (QSDFT) for Pore Size Analysis of Cylindrical and Spherical Pore Carbons.
Quantachrome Instruments for CO2 adsorption are the iSorbHP, Quadrasorb evo, NOVA and Autosorb iQ,