Molecular sieve SSZ-75 composition of matter and synthesis thereof
The present invention relates to new crystalline molecular sieve SSZ-75 having STI topology prepared using a tetramethylene-1,4-bis-(N-methylpyrrolidinium) dication as a structure-directing agent, and methods for synthesizing SSZ-75.
1. A crystalline molecular sieve having STI topology and having a mole ratio of at least 15 of (1) an oxide of a first tetravalent element to (2) an oxide of a trivalent element, pentavalent element, second tetravalent element which is different from said first tetravalent element or mixture thereof.
2. The molecular sieve of claim 1 wherein the molecular sieve has a mole ratio of at least 15 of (1) silicon oxide to (2) an oxide selected from aluminum oxide, gallium oxide, iron oxide, boron oxide, titanium oxide, indium oxide and mixtures thereof.
3. The molecular sieve of claim 1 having, after calcination, the X-ray diffraction lines of Table II.
4. The molecular sieve of claim 2 having, after calcination, the X-ray diffraction lines of Table II.
5. A crystalline molecular sieve having a composition comprising, as synthesized and in the anhydrous state, in terms of mole ratios, the following:
SiO 2 /X c O d
at least 15
M 2/n /SiO 2
0-0.03
Q/SiO 2
0.02-0.08
F/SiO 2
0.01-0.04
wherein X is aluminum, gallium, iron, boron, titanium, indium and 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; Q is a tetramethylene-1,4-bis-(N-methylpyrrolidinium) dication and F is fluoride.
6. A method of preparing a crystalline material, said method comprising contacting under crystallization conditions (1) a source of silicon oxide, (2) a source of aluminum oxide, gallium oxide, iron oxide, boron oxide, titanium oxide, indium oxide and mixtures thereof, (3) fluoride ions and (4) a structure directing agent comprising a tetramethylene-1,4-bis-(N-methylpyrrolidinium) dication.
7. The method of claim 6 wherein the crystalline material is prepared from a reaction mixture comprising silicon oxide and, in terms of mole ratios, the following:
SiO 2 /X a O b
at least 15
OH — /SiO 2
0.20-0.80
Q/SiO 2
0.20-0.80
M 2/n /SiO 2
0-0.04
H 2 O/SiO 2
2-10
HF/SiO 2
0.20-0.80
wherein X is aluminum, gallium, iron, boron, titanium, indium and mixtures thereof, a is 1 or 2, b is 2 when a is 1, b is 3 when a is 2, M is an alkali metal cation, alkaline earth metal cation or mixtures thereof; n is the valence of M and Q is a tetramethylene-1,4-bis-(N-methylpyrrolidinium) dication.