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. 09, 1999
Filed:
Aug. 26, 1996
Applicant:
Inventors:
Eckehart Roland, Bruchkoebel, DE;
Wolfgang Lutz, Berlin, DE;
Assignee:
Degussa Aktiengesellschaft, Frankfurt am Main, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
502 79 ; 502 85 ; 423713 ; 423714 ;
Abstract
Y zeolites with an SiO.sub.2 /Al.sub.2 O.sub.3 ratio in the framework of>100 with a high hydrothermal stability and resistance to aqueous, alkaline solutions are produced by treating a Y zeolite with a SiO.sub.2 /Al.sub.2 O.sub.3 ratio between 8 and 50, partially dealuminized according to known methods from NaY zeolite by treatment with silicon tetrachloride, with water vapor at temperatures between 500.degree. C. and 1000.degree. C.