Method for preparing zeolite SSZ-35
A method for making zeolite SSZ-35 having the framework structure STF is disclosed using a N,N-diethyl-2,3-dimethylpiperidinium cation or a N,N-dimethyl-2-isopropylpiperidinium cation as a structure directing agent.
1. A method for preparing zeolite SSZ-35, comprising:
(a) preparing a reaction mixture containing: (1) at least one source of at least one oxide of a tetravalent element; (2) optionally, one or more sources of one or more oxides selected from the group consisting of oxides of trivalent elements, pentavalent elements, and mixtures thereof; (3) at least one source of an element selected from Groups 1 and 2 of the Periodic Table; (4) hydroxide ions; (5) a structure directing agent selected from the group consisting of a N,N-diethyl-2,3-dimethylpiperidinium cation and a N,N-dimethyl-2-isopropylpiperidinium cation; and (6) water; and
(b) maintaining the reaction mixture under crystallization conditions sufficient to form crystals of the zeolite.
2. The method of claim 1 , wherein the zeolite is prepared from a reaction mixture comprising, in terms of mole ratios, the following:
TO 2 /X 2 O n
≧10
M/TO 2
0.01 to 0.50
Q/TO 2
0.05 to 0.50
OH/TO 2
0.10 to 0.70
H 2 O/TO 2
15 to 100
wherein:
(1) T is selected from the group consisting of tetravalent elements from Groups 4-14 of the Periodic Table, and mixtures thereof;
(2) X is selected from the group consisting of trivalent and pentavalent elements from Groups 3-13 of the Periodic Table, and mixtures thereof;
(3) n equals the valence state of X;
(4) M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table; and
(5) Q is a structure directing agent selected from the group consisting of a N,N-diethyl-2,3-dimethylpiperidinium cation and a N,N-dimethyl-2-isopropylpiperidinium cation.
3. The method of claim 2 , wherein T is selected from the group consisting of Si, Ge, and mixtures thereof.
4. The method of claim 2 , wherein X is selected from the group consisting of B, Al, Ga, In, and mixtures thereof.
5. The method of claim 2 , wherein T is Si and X is B.
6. The method of claim 2 , wherein T is Si and X is Al.
7. The method of claim 2 , wherein the zeolite is prepared from a reaction mixture comprising, in terms of mole ratios, the following:
TO 2 /X 2 O n
20 to 60
M/TO 2
0.03 to 0.40
Q/TO 2
0.05 to 0.40
OH/TO 2
0.15 to 0.40
H 2 O/TO 2
20 to 50.
8. The method of claim 1 , wherein the structure directing agent is a N,N-diethyl-2,3-dimethylpiperidinium cation.
9. The method of claim 1 , wherein the structure directing agent is a N,N-dimethyl-2-isopropylpiperidinium cation.
10. The method of claim 1 , wherein the zeolite has a composition, as-synthesized and in its anhydrous state, in terms of mole ratios, as follows:
TO 2 /X 2 O n
≧10
Q/TO 2
0.01 to 0.10
M/TO 2
0 to 0.04
wherein:
(1) T is selected from the group consisting of tetravalent elements from Groups 4-14 of the Periodic Table, and mixtures thereof;
(2) X is selected from the group consisting of trivalent and pentavalent elements from Groups 3-13 of the Periodic Table, and mixtures thereof;
(3) n equals the valence state of X;
(4) Q is a structure directing agent selected from the group consisting of a N,N-diethyl-2,3-dimethylpiperidinium cation and a N,N-dimethyl-2-isopropylpiperidinium cation; and
(5) M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table.
11. The method of claim 10 , wherein the zeolite has a composition, as-synthesized and in its anhydrous state, in terms of mole ratios, as follows:
TO 2 /X 2 O n
20 to 60
Q/TO 2
0.01 to 0.10
M/TO 2
0 to 0.04.
12. The method of claim 10 , wherein T is Si and X is B.
13. The method of claim 10 , wherein T is Si and X is Al.