Patent ID: 6086848
Filing Date: 2000-07-11
Classification: B01J,C01B

Abstract:
A process for preparing zeolites having 12-ring pores and having at least one internal pore structure with a cross section measuring greater than 7.5 .ANG., the process comprising:(a) preparing an aqueous solution from (1) sources of an alkali metal oxide, alkaline earth metal oxide or mixtures thereof; (2) sources of an oxide of a first tetravalent element or mixture of tetravalent elements; (3) sources of an oxide of a second tetravalent element different from the first tetravalent element(s), trivalent element, pentavalent element or mixture thereof; and (4) at least one organic templating agent comprising a substituted-piperidinium cation of the formula: ##STR7## where R.sub.1 and R.sub.2 are each lower alkyl or together with the nitrogen atom form a five or six member spiro ring which may be substituted with at least one lower alkyl group, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are each independently lower alkyl or hydrogen with the proviso that at least one is lower alkyl; and(b) maintaining the aqueous solution under conditions sufficient to form crystals of the zeolite.