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Technical article

BET surface area and pore size measurement by Static volumetric method

Views:10119 Date:2015-12-23

In the static volumetric method, a known amount of gas is admitted to a sample bulb thermostated at the adsorption temperature. Adsorption of the gas on to the sample occurs, and the pressure in the confined volume continues to fall until the adsorbate and the adsorptive are in equilibrium. The amount of adsorbate at the equilibrium pressure is the difference between the amount of gas admitted and the amount of adsorptive remaining in the gas phase. Measurement of the pressure is required together with temperatures and volumes of the system. The volumes are most easily determined by gas expansion of an inert gas such as helium. Determine the dead volume before or after the measurement of the adsorption isotherm. 

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Record No. 110102003097