Micropore Size Analysis of Porous Carbons Using CO2 Adsorption at 273 K
The pore size distribution (PSD) is a key factor in characterizing porous materials. The PSD analysis can be useful in developing new porous materials for specific applications as well as for testing existing products. Nova 800 and 600 instruments are an ideal choice for analysis of porous carbons using CO2 adsorption at 273 K.
Activated carbons fibers, pellets, granules, or powders are used in air filters, in water purification systems, for removing organic impurities from various solutions, and in a variety of medical, environmental, and agricultural applications. These microporous, high surface area materials are often characterized by their apparent BET area and their pore size distribution (PSD). Filling the micropores and subsequently calculating the micropore size distribution using nitrogen or argon is a slow process, requiring high-resolution pressure transducers and a turbomolecular pump for achieving very low vacuum levels. Alternatively, the PSD can be determined faster using carbon dioxide as adsorbate at 273 K, at higher pressures than nitrogen or argon, thus increasing throughput and reducing equipment cost.
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