Process for preparing zeolites using substituted-piperidinium cations
AssigneeChevron U.S.A. Inc.
InventorsYumi Nakagawa, Gregory S. Lee, Stacey I. Zones
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Abstract
The present invention relates to 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. using substituted-piperidinium cations as organic templates.
Claims16
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.
A zeolite having 12-ring pores and having at least one internal pore structure with a cross section measuring greater than 7.5 .ANG., as-synthesized and in the anhydrous state, whose general formula, in terms of mole ratios, is as follows:
- ______________________________________ YO.sub.2 /W.sub.c O.sub.d >15 Q/YO.sub.2 0.01-0.03 M.sub.2/n /YO.sub.2 0.01-0.04 ______________________________________ wherein Y is silicon, germanium or a mixture thereof;
- W is aluminum, gallium, iron, boron, titanium, indium, vanadium or mixtures thereof;
- c is 1 or 2;
- d is 2 when c is 1 or d is 3 or 5 when c is 2;
- M is an alkali metal cation, alkaline earth metal cation or mixtures thereof;
- n is the valence of M;
- and Q is at least one substituted-piperidinium cation of the formula:
- ##STR9## 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.
Dependencies are inferred from the claim text.