PT HYBRID CATALYSTS CONTAINING HY ZEOLITE AND SULFATE-PROMOTED ZIRCONIA OR ACIDIC MESOPOROUS SILICA-ALUMINA FOR THE CONVERSION OF N-OCTANE/

Pt hybrid catalysts containing Y zeolite as main component and sulfate -promoted zirconia or acidic/mesoporous silica-alumina as co-catalyst show enhanced activity in the hydroisomerization/hydrocracking of n-oc tane. This synergistic effect is due to the surface acidic and textura l properties of the co-catalyst. The best co-catalyst must have a high surface acidity, a large surface area and an open pore system. The be st Pt hybrid catalyst had the Pt species homogeneously spread over the three components of the catalyst.