Hydrocracking of residual oils with iron supported zeolite containing catalyst

Abstract Hydrogen spillover on a hydrocracking catalyst containing an iron supported Y zeolite has been studied. An iron supported Y zeolite was prepared by treating NH 4 -Y zeolite with aqueous solution of ferric nitrate. The iron supported zeolite showed high toluene dispropor-tionation activity in the presence of hydrogen and hydrogen sulfide, while it was poisoned by potassium ion exchange. A hybrid catalyst prepared by physically mixing a USY and the poisoned iron supported zeolite showed the high disproportionation activity, while the USY and the poisoned iron supported zeolite showed low activity. It was suggested that spillover hydrogen is supplied from iron species to Bronsted acid sites on zeolites to promote acid catalyzed reaction. In the case of hydrocracking catalyst composed of transition metals, iron supported zeolite and alumina, spillover hydrogen is also supplied from transition metals on alumina to zeolite surface to promote acid catalyzed reaction.