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Article

Construction of a Low-Cost Apparatus for Gas Adsorption on Solids

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Hugo Macedo , Ana Aguiar Ricardo and João Sotomayor

REQUIMTE, CQFB, Departamento de Química, FCT, Universidade Nova de Lisboa, Caparica, 2829-516, Portugal

J. Chem. Educ., 2006, 83 (6), p 915

DOI: 10.1021/ed083p915

Publication Date (Web): June 1, 2006

Section:

Apparatus and Plant Equipment

Abstract

The construction of a low-cost apparatus for gas adsorption on solids and prior heat treatment of the adsorbent are discussed. The equilibrium pressure of the gas in a calibrated volume at a constant temperature is related to the extent of the gas adsorption. By means of the adsorption results, the solid surface-area calculation is performed using both BET and Langmuir isotherms. This apparatus provides surface-area values in good agreement with both values obtained by a commercial instrument and those reported in the literature, within the experimental error.