SYNTHESIS, CHARACTERIZATION, AND CATALYTIC ACTIVITY OF SULFIDED SILICO-ALUMINO-TITANATE (SI-AL-TI) MIXED OXIDES XEROGELS SUPPORTED NI-MO CATALYST

Layered semicrystalline silico-alumino-titanate (Si-Al-Ti) mixed oxide s were synthesized by a modified sol-gel method with hydrothermal synt hesis temperatures less than 200 degrees C and autogenic pressure. The solid products are semicrystalline materials with a surface area of 1 36-367 m(2)/g and a monomodal pore size distribution with an average p ore diameter of 36-47 Angstrom. The catalytic activity for pyrene hydr ogenation in a batch reactor at 300 degrees C and 500 psig was determi ned for sulfided Ni-Mo supported on the Si-Al-Ti mixed oxide. The acti vity was a function of the support composition, the heat treatment bef ore and after loading the active metals, the addition of organic templ ates, and different methods of metal loading. The most active sulfided Ni-Mo/Si-Al-Ti catalyst has an activity in the same range as the comm ercial catalyst, Shell 324, but the metal loading is 37% less than the commercial catalyst. (C) 1998 Academic Press.