Catalyst poisons passivated with tin compounds plus both sulfur and phosphorus
AssigneePhillips Petroleum Company
InventorsJohn S. Roberts, Brent J. Bertus, Dwight L. McKay, H. Wayne Mark
Life of this patent
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Abstract
Deposits on a cracking catalyst are passivated by contacting the cracking catalyst with tin and at least one of phosphorus or sulfur.
Claims11
A process for improving the metals resistance of a zeolite-containing cracking catalyst to have deposited thereon at least one contaminant selected from the group consisting of nickel, vanadium and iron from the cracking of a hydrocarbon feed without incorporating with said cracking catalyst antimony or a compound thereof, said process comprising contacting said zeolite-containing cracking catalyst with at least one treating agent composition represented by the formula ##STR3## wherein R is hydrocarbyl having from 1 to 24 carbon atoms, wherein each X is selected from the group consisting of oxygen and sulfur and at least one X is sulfur, and wherein n is 2 to 4, so as to impart to said cracking catalyst a passivating amount of tin.
A process for increasing the selectivity of a cracking catalyst for gasoline production in the essential absence of antimony comprising contacting a zeolite-containing cracking catalyst having deposited thereon from the cracking of a hydrocarbon feedstock at least one contaminant selected from the group consisting of nickel, vanadium and iron with at least one treating agent composition represented by the formula ##STR4## wherein each R is hydrocarbyl having from 1 to about 24 carbon atoms and n is 2 or 4 so as to impart to said cracking catalyst a tin concentration of from about 0.005 to about 1 percent by weight of the contacted cracking catalyst.
Dependencies are inferred from the claim text.