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:
May. 01, 2001
Filed:
Sep. 09, 1999
Marcel J. G. Janssen, Kessel-Lo, BE;
Machteld M. Mertens, Boortmeerbeek, BE;
Cornelius W. M. Van Oorschot, Brasschaat, BE;
Stephen N. Vaughn, Kingwood, TX (US);
Hsiang-Ning Sun, Houston, TX (US);
David R. Lumgair, Kingwood, TX (US);
Exxon Mobil Chemical Patents Inc., Houston, TX (US);
Abstract
This invention is directed to a molecular sieve having acid catalyst sites and a method of maintaining the acid catalyst sites of a template-containing silicoaluminophosphate molecular sieve. The method comprises providing a template-containing silicoaluminophosphate molecular sieve and heating the molecular sieve in an oxygen depleted environment under conditions effective to maintain or preserve the number of acid catalyst sites. The heated molecular sieve exhibits at least one peak in the infrared region in a range of from 3630 cm,to 3580 cm,. Preferably, the heated molecular sieve exhibits a combined peak area in the 3630 cm,to 3580 cm,range of at least 10% of a total peak area of all peaks in an infrared region between 4000 cm,to 3400 cm,.