ACIDIC PROPERTIES OF CAO-SIO2 BINARY OXIDE CATALYST AND ACTIVITY FOR ACID CATALYSIS

A series of CaO-SiO2 catalysts were prepared by coprecipitation from t he mixed solution of calcium chloride and sodium silicate. The additio n of CaO to SiO2 caused the increase of acidity and the shift of O-H a nd Si-O stretching bands of the silanol group to a lower frequency in proportion to the CaO content. The acid structure of CaO-SiO2 agreed w ith that proposed by Tanabe et al.. Catalytic activity for 2-propanol dehydration and cumene dealkylation increased in relation to the incre ase of acidity and band shift to a lower frequency.