Molecular sieve ssz-71 composition of matter and synthesis thereof
AssigneeChevron U.S.A. Inc.
InventorsCong-Yan Chen, Allen Burton, Ann Liang
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Abstract
The present invention relates to new molecular sieve SSZ-71 prepared using a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation as a structure-directing agent, methods for synthesizing SSZ-71 and processes employing SSZ-71 in a catalyst.
Claims17
A molecular sieve having a composition, as synthesized and in the anhydrous state, in terms of mole ratios as follows:
- YO2/WOd 15-∞
- M2/n/YO2 0-0.03
- Q/YO2 0.02-0.05
- wherein Y is silicon, germanium or a mixture thereof;
- W is zinc, titanium or mixtures thereof;
- d is 1 or 2;
- M is an alkali metal cation, alkaline earth metal cation or mixtures thereof;
- n is the valence of M;
- and Q is a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation, the as-synthesized molecular sieve having the X-ray diffraction lines of Table I.
A molecular sieve produced by the method comprising:
- (1) preparing an as-synthesized molecular sieve having a composition, as synthesized and in the anhydrous state, in terms of mole ratios as follows:
- YO2/WOd 15-∞
- M2/n/YO2 0-0.03
- Q/YO2 0.02-0.05
- wherein Y is silicon, germanium or a mixture thereof;
- W is zinc, titanium or mixtures thereof;
- d is 1 or 2 (i.e., d is 1 when W is divalent or 2 when W is tetravalent);
- M is an alkali metal cation, alkaline earth metal cation or mixtures thereof;
- n is the valence of M (i.e., 1 or 2);
- and Q is a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation, the as-synthesized molecular sieve having the X-ray diffraction lines of Table 1;
- (2) thermally treating the as-synthesized molecular sieve at a temperature and for a time sufficient to remove the N-benzyl-1,4-diazabicyclo[2.2.2]octane cation from the molecular sieve;
- and
- (3) optionally, replacing at least part of the zinc and/or titanium with a metal selected from the group consisting of aluminum, gallium, iron, boron, indium, vanadium and mixtures thereof.
A method of preparing a molecular sieve comprising (1) a first oxide comprising silicon oxide, germanium oxide or a mixture thereof and (2) a second oxide comprising zinc oxide, titanium oxide or a mixture thereof and having mole ratio of the first oxide to the second oxide of greater than 15 and having, in its as-synthesized, anhydrous state, the X-ray diffraction lines of Table I, said method comprising contacting under crystallization conditions sources of said oxides and a structure directing agent comprising a N-benzyl-1,4-diazabicyclo[2.2.2]octane cation.
Dependencies are inferred from the claim text.