SUPERACID PROPERTIES OF AL2O3-SBF5 CATALYTIC-SYSTEM

Chemical and catalytic properties of /Al2O3-SbF5 system has been studi ed. It was found that alumina upon SbF, adsorption became solid supera cid of Bronsted nature, able to catalyze n-pentane low temperature iso merization. The following structure of superacid active center has bee n postulated: [=Al-O-SbF5]H--(+). The stability of this catalyst was e valuated using time-on-stream theory of catalysts decay and then compa red with other Bronsted (Al2O3-BF3) and Lewis (Al2O3-AlCl3) superacid systems. It was found that Bronsted superacid centers are more stable than Lewis ones.