Sorption of Hydrogen on Alumina

Abstract

Only one series of experimental data on the hydrogen sorption of alumina is available in the literature. H. S. Taylor1"reported the sorption at 650 mm. and 445 and 525°to be of the order of 0.2 ml. STP/g. for an alumina formed by heating the precipitate from treating aluminum nitrate with ammonia. The heat of sorption was about 27,500 cal. per mole, sorption was reversible, and no water was formed during sorption and desorption. Th. Schoon and H. Klette2 did not give quantitative data but reported verification of the "stairlike form of the adsorption isotherm'' for hydrogen on a number of materials including alumina.The present work presents values of hydrogen sorption on various forms of alumina in the temperature range 400 to 900°, and in the pressure range 9 to 620 mm.

Adsorption

“…Miscellaneous. The sorption of hydrogen by alumina at high temperatures was found to be slow, indefinite, and covering only a few per cent of the surface (129). The sorption of w'ater by activated iron oxide, alumina, and silica was studied (122) and compared to actions of soils and bleaching of crude vegetable oils.…”