Catalyst for cracking oil feedstocks contaminated with metal

摘要

A calcined cracking catalyst comprising zeolite crystals in an inorganic oxide matrix and containing less than about 0.75% Na2O and, from 0.1 to 10% P expressed as P2O5, the cracking catalyst being further characterized by exhibiting a spectra with a peak at about 3735 cm-1 when treated with pyridine and analyzed by FTIR. A process for manufacturing an FCC catalyst characterized by high tolerance to contaminated metals comprises providing fluid cracking catalyst microspheres containing zeolite Y in an inorganic oxide matrix and analyzing 20 to 60% by weight Al2O3 and analyzing less than 0.75% wt. Na2O; impregnating the catalyst with a solution of a phosphate or phosphite salt in amount such the microspheres analyze 0.5 to 10% by weight P2O5 and calcining the microspheres in the absence of steam at a temperature above 1300 DEG F. and below 1600 DEG F. and recovering the product characterized exhibiting a spectra with a peak at about 3687 cm-1 and the intensity ratio of the peak at 3687 cm-1 to the peak at 3675 cm-1 is greater than about 0.8 when treated with pyridine and analyzed by FTIR.