PENTASIL CATALYST FOR LIGHT OLEFINS IN FLUIDIZED CATALYTIC UNITS

摘要

The catalyst of this invention is capable of enhancing light olefin, e.g., propylene, yields in fluidizable catalytic cracking (FCC) processes. The catalyst comprises (a) pentasil zeolite, (b) at least 5% by weight phosphorus (P2O5) based on particles containing the pentasil, and at least about 1% by weight iron oxide, as measured by Fe2O3, outside of the pentasil zeolite's framework. The catalyst is fluidizable and has an average particle size in the range of about 20 to about 200 microns. The catalyst composition can further comprise additional zeolite suitable for cracking hydrocarbons in a FCC process. The catalyst has been shown to be highly active compared to other catalysts and shows a high selectivity for propylene produced in an FCC process.