Physical and chemical properties of WS2 catalysts Communication 2. Adsorption properties of mixed WS2 -clay catalysts

Abstract

1. The adsorption characteristics of two mixed WS2 catalysts and of clays forming components of these catalysts (terrana and Tavtiman clay) were determined from adsorption measurements on nitrogen vapor at the temperature of liquid nitrogen and toluene from its solution in isooctane at room temperature. 2. Investigation of the specific surfaces and porous structures of the mixed WS2 catalysts and their component clays showed that these properties of the catalyst are mainly determined by the same properties of the clay carrier. With the given method of preparation, the specific surfaces and pore volumes of the mixed catalysts are less than for the component clays. 3. It was shown by experiments on the adsorption of toluene from its solution in isooctane that the number of toluene molecules in the adsorption volume of a WS2 catalyst is less than the number of nitrogen molecules in a monolayer in the adsorption of nitrogen at the temperature of liquid nitrogen. 4. From a consideration of the data in [4] in relation to the adsorption properties of the same samples of catalysts, as reported in the present paper, it follows that there is a symbatic relationship between catalytic activity for the transformations of benzene or cyclohexane at 420° at an initial hydrogen pressure of 140 atm and the specific surface and pore volume.