Study of n-hexane isomerization on mixed Al2O3-ZrO2/SO42- catalysts

Mixed oxides of alumina and zirconia having a relative composition of 50, 8 0 and 100% Zr2O were synthesized by means of sol-gel methods. The catalysts were sulfated with H2SO4 1N, and were loaded with 0.3% Pt metal using the incipient wetness technique. The characterization of the physicochemical pr operties was carried out using XRD, N-2-adsorption at 78 K, and SEM. The ca talytic properties of the Al2O3-ZrO2 series were studied by means of dehydr ation of 2-propanol at 180 degreesC and isomerization of n-hexane at 250 de greesC, 1 atm. The sulfated solids presented a high surface acidity and a l imited crystallinity, together with high activity for alcohol dehydration ( i.e. 2-propanol). On the other hand, the Al2O3-ZrO2 solid solutions (i.e. t hose having a 20-80% composition) turned out to be the most active ones for the isomerization of n-hexane. (C) 2001 Elsevier Science B,V. All rights r eserved.