Collect. Czech. Chem. Commun. 1991, 56, 569-579

Argon and nitrogen adsorption on graphite at high temperatures

Eduardo Jorge Bottani, Jorge Luis Llanos and Lydia Ethel Cascarini de Torre

Instituto de Investigaciones Fisicoquimicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, UNLP, Casilla de Correo 16, Suc. 4 RA-1900, La Plata, Argentina


Nitrogen and argon adsorption on two graphites differing in their surface homogeneity was studied in a wide range of temperatures (77.5 K up to 183.2 K). The experimentally determined entropy of the adsorbed phase and isoteric heat of adsorption were analyzed. The Hill-de Boer adsorption isotherm was employed to calculate the apparent two-dimensional critical temperature. The behaviour of the adsorbed film was analyzed to explain the influence exerted upon it by temperature and surface homogenity.