ACIDITY STUDIES ON PILLARED CLAYS (PILCS) BY PYRIDINE ADSORPTION AND 1-BUTANOL DEHYDRATION

A study was made on the acidic properties of clays, from different par ent materials, pillared with aluminium or zirconium species. In conjun ction with the well known method of pyridine desorption followed by in frared spectroscopy, the reaction test of 1-butanol dehydration was ca rried out. Also the heats of adsorption and the amounts of adsorbed py ridine, were determined by a thermogravimetry coupled with Differentia l Scanning Calorimetry (TG-DSC). The information on the acidic propert ies of the materials, obtained by the three methods, is discussed and it is concluded that the latter method (TG/DSC), although not currentl y used as one could expect, is sufficiently expedite and appropriate f or this purpose.