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...http://www.google.de/patents/US6448460?utm_source=gb-gplus-sharePatent US6448460 - Maintaining acid catalyst sites in SAPO molecular sieves
