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:
Oct. 19, 1976
Filed:
Jun. 03, 1974
Roger Crowson, Richmond, EN;
John David Hargrove, Aldershot, EN;
Christopher Ronald Pout, Feltham, EN;
The British Petroleum Company Limited, London, EN;
Abstract
The regeneration of a Pt group metal-acid-resistant, alkali-metal deficient zeolite catalyst comprises (a) a burn off at 500.degree. C max (b) a treatment with inert gas, 0.5-20% vol 0.sub.2 and 5-500 ppm vol Cl at 400.degree.-550.degree. C (c) a purge and (d) a reduction in a stream of H.sub.2 at 200.degree.-600.degree. C. The treatment with inert gas, 0.sub.2 Cl is believed to redistribute the Pt group metal and restore catalyst activity in a way that burn-off alone cannot do. The Cl may be added as Cl, Cl,HCl or an organic chlorine-containing material. The catalysts may have a SiO.sub.2 - Al.sub.2 O.sub.3 molar ratio of at least 5:1 to ensure acid resistance and the preferred catalyst is Pt-H-mordenite which has been used for the selective cracking of n-paraffins in petroleum fractions.