The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 1985
Filed:
Dec. 09, 1983
Carl F Bertsch, Baton Rouge, LA (US);
Exxon Research and Engineering Co., Florham Park, NJ (US);
Abstract
A method for passivating the adverse catalytic effects of metal contaminants, such as nickel, vanadium and iron, which become deposited on cracking catalyst is disclosed. A passivation promoter comprising elemental tin and/or a tin compound in combination with elemental cadmium and/or a cadmium compound is deposited on the catalyst and the catalyst is passed through a passivation zone having a reducing atmosphere maintained at an elevated temperature to decrease the adverse catalytic effects of the metal contaminants The present method is of particular utility where the residence time of the cracking catalyst in the passivation zone is relatively short.