Abstract
BET (Brunauer Emmett and Teller) surface area and pore volume were measured for the samples of HCP by N2 adsorption (–195 °C) with Autosorb-1C (American Quantachrome Company). Both physi-sorption and chemi-sorption of CO2 at a given temperature were also carried out with Autosorb-1C after the samples of HCP had been pretreated in vacuum or helium at a given temperature.
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