CoMo/USY Catalysts Prepared by Precipitation Methods: Effect of pH Treatment

The Effect of pH treatment in the CoMo/USY catalysts prepared by precipitation was investigated. The pH of the precursor solution was controlled at pH 2, 7, and 8. Catalysts were characterized by XRF, XRD, N₂ adsorption, and IR spectroscopy. It was established that pH treatment in the catalysts significantly influences on the metal loading. Catalysts at pH 7 had maximal of amount total metals with particles type of CoO, MoO₃, Co, and Mo. Metal loading affects the decreasing of surface area, pore volume, and average pore radius. In addition, the number of hydroxyl group in the catalyst was less than USY followed by shifting of its wavenumber.