Microcalorimetric and FT-IR spectroscopic study of benzene adsorption on \u3b1-Fe2O3 and \u3b3-Al2O3

The adsorption of benzene at room temperature on \u3b1-Fe2O3 and on \u3b3-Al2O3 powders was investigated by heat-flow microcalorimetry and FT-IR spectroscopy. On iron oxide a chemisorption-combustion step is followed by a highly exothermic adsorption step, reversible at r.t. Few combustion centres exist on alumina if reducing pretreatment is not carried out. Two reversible adsorption steps are subsequently observed and were interpreted as due to interaction with two different types of surface hydroxy groups. \ua9 1984 Wiley Heyden Ltd., Chichester and Akad\ue9miai Kiad\uf3, Budapest