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:
Feb. 09, 1993
Filed:
Jul. 24, 1991
Michelle J Cohn, Mt. Prospect, IL (US);
R Joe Lawson, Palatine, IL (US);
Mark D Moser, Elk Grove Village, IL (US);
UOP, Des Plaines, IL (US);
Abstract
Metal migration from molecular sieve particles to binder particles in agglomerates of molecular sieves bearing group VIII zerovalent metal occurs readily at temperatures above 350.degree. C. Such migration can seriously impair the performance of the catalyst whose effectiveness depends on the presence of the metal largely, if not exclusively, on the molecular sieve particle. Exposure of the catalyst, or a catalyst precursor, to temperatures facilitating group VIII metal migration can occur at various periods during the catalyst's history. Group VIII metal migration can be inhibited and often effectively prevented when chlorine or a chlorine-containing compound is present in the non-reducing atmosphere at temperatures which otherwise would bring about metal migration.