Influence of alumina addition on structural and catalytic properties of sulphated zirconia in isomerization of n-hexane

New binary catalytic systems based on sulphated zirconia-alumina were synthesized by controlled hydrolysis of alkoxides using relative molar ratios constituents 1:1, 1:2 and 1:3 in favour zirconia. The obtained differences the final material?s properties may be related to organic precursor memory effect, applied calcinations temperatures used alumina contents. addition zirconia affected structural surface stabilizing bare means slower phase transformation tetragonal crystal into monoclinic one, further resulting smaller crystallites sizes higher density acidic function (sulphates). best impact physico-chemical was achieved when highest amount (e.g. 50%) lower calcination temperature (500?C) used, causing relatively high steady-state activity isomerization n-hexane at reaction 250 ?C. On other hand, (600 ?C) played a role genesis greater sulphate density. Catalytic selectivity are expressed as complex synergistic acid sites together with positive status optimized material (by activation temperatures).