TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - preferred Composition: The composition comprises fumed silica (5 wt. %). The composition further comprises an aluminum compound (preferably aluminum oxide); Group VIII metal (preferably platinum or palladium). The composition comprises: tungsten oxide and zirconium oxide; molybdenum oxide and zirconium oxide; sulfate and zirconium oxide; sulfate and titanium oxide; sulfate and tin oxide. The fumed silica is admixed with precipitated silica; colloidal silica or alumina. Preferred Components: Group IVA element is titanium or zirconium. The group VIB element is molybdenum or tungsten. Preferred Process: The chemical conversion is isomerization, catalytic cracking or (trans)alkylation. The conversion is carried out at 93 - 425 degreesC. at 1 - 100 psig and LHSV from 1 - 10.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - preferred Composition: The composition comprises fumed silica (5 wt. %). The composition further comprises an aluminum compound (preferably aluminum oxide); Group VIII metal (preferably platinum or palladium). The composition comprises: tungsten oxide and zirconium oxide; molybdenum oxide and zirconium oxide; sulfate and zirconium oxide; sulfate and titanium oxide; sulfate and tin oxide. The fumed silica is admixed with precipitated silica; colloidal silica or alumina. Preferred Components: Group IVA element is titanium or zirconium. The group VIB element is molybdenum or tungsten. Preferred Process: The chemical conversion is isomerization, catalytic cracking or (trans)alkylation. The conversion is carried out at 93 - 425 degreesC. at 1 - 100 psig and LHSV from 1 - 10. EXAMPLE - The platinum/tungsten oxide/aluminum-zirconium oxide (2.4 parts) was mixed with AEROSIL 200 (RTM; fumed silica) (0.11 parts) and deionized water (2.75 parts). The mixture was calcinated at 90degreesC for 1 hour, at 120degreesC for 1 hour and at 450degreesC for 5 hours. The material was pulverized to fine catalyst powder. The comparative catalyst was prepared by impregnating above catalyst excluding AEROSIL 200 (RTM; fumed silica) (18 parts with platinum nitrate.(ammonia) (6.21 parts), followed by calcinating at 350degreesC for 3 hours. Both catalysts were tested for n-heptane isomerization. The conversion n-heptane for test/comparative was found to be 70.3/38.4% at 94.7/98% selectivity.