Molecular sieve SSZ-117x with high acidity
View Patent ↗A novel synthetic crystalline aluminogermanosilicate molecular sieve material, designated SSZ-117x, is provided which exhibits increased acidity. The SSZ-117x can be synthesized using N,N,N,3,5-pentamethyladamantan-1-ammonium cations as a structure directing agent. The synthesis employs a boron pathway to achieve increased acid sites. The SSZ-117x of increased acidity may be used in organic compound conversion reactions and/or sorptive processes.
1 . A molecular sieve having a powder X-ray diffraction pattern including the following peaks:
2-Theta
d-Spacing, nm
Relative Intensity
8.00
1.10
M
11.65
0.76
VS
18.8
0.47
M
21.8
0.41
M(Broad)
22.8
0.39
S
and with the molecular sieve comprising boron and having increased acid sites due to a boron pathway.
2 . The molecular sieve of claim 1 , having a composition comprising a molar relationship:
Al 2 O 3 :( n )TO 2
wherein n is ≥150; and T is a tetravalent element comprising silicon and germanium.
3 . The molecular sieve of claim 1 , having a composition comprising a molar relationship:
Al 2 O 3 :( n )TO 2
wherein n is ≥300; and T is a tetravalent element comprising silicon and germanium.
4 . The molecular sieve of claim 1 , having a chemical composition comprising the following molar relationship:
TO 2 /Al 2 O 3
≥150
SiO 2 /GeO 2
4 to 12
wherein T is a tetravalent element comprising silicon and germanium.
5 . A process for converting a feedstock comprising an organic compound to a conversion product, the process comprising contacting the feedstock at organic compound conversion conditions with a catalyst comprising the molecular sieve of claim 4 .
6 . A process of ion exchanging metals, the process comprising contacting a stream comprising heavy metals with the molecular sieve of claim 4 .
7 . The molecular sieve of claim 1 , wherein the amount of boron in the molecular sieve ranges from 50-250 ppm.
8 . A method of synthesizing the molecular sieve of claim 1 , the method comprising:
(a) providing a reaction mixture comprising:
(1) a FAU framework type zeolite having a SiO 2 /Al 2 O 3 mol ratio of 300 or greater;
(2) a source of germanium;
(3) a source of boron;
(4) N,N,N,3,5-pentamethyladamantan-1-ammonium hydroxide (Q);
(5) a source of fluoride ions; and
(6) water;
(b) subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the molecular sieve which contain boron;
(c) removing Q from the molecular sieve framework; and
(d) replacing some of the boron in the molecular sieve crystals with aluminum.
9 . The method of claim 8 , wherein the reaction mixture has a composition, in terms of molar ratios, as follows:
TO 2 /B 2 O 3
≥10
Q/TO 2
0.10 to 1.00
F/TO 2
0.10 to 1.00
H 2 O/TO 2
2 to 10
SiO 2 /GeO 2
4 to 12
wherein T is a tetravalent element comprising silicon and germanium.
10 . The method of claim 8 , wherein the reaction mixture has a composition, in terms of molar ratios, as follows:
TO 2 /B 2 O 3
15 to 20
Q/TO 2
0.20 to 0.70
F/TO 2
0.20 to 0.70
H 2 O/TO 2
4 to 8
SiO 2 /GeO 2
7 to 10
wherein T is a tetravalent element comprising silicon and germanium.
11 . The method of claim 8 , wherein the FAU framework type zeolite is zeolite Y, or a post-synthetic modified form.
12 . The method of claim 8 , wherein the crystallization conditions include a temperature of from 125° C. to 200° C.
13 . The method of claim 8 , wherein the reaction mixture has a Q/F molar ratio in a range of 0.8 to 1.2.
14 . The process of claim 8 , wherein the Q is removed by calcination.
15 . The process of claim 8 , wherein the Q is removed by treatment with ozone.
16 . The process of claim 8 , wherein the replacing of boron with aluminum comprises refluxing the molecular sieve crystals with a solution of aluminum nitrate.
17 . A process for converting a feedstock comprising an organic compound to a conversion product, the process comprising contacting the feedstock at organic compound conversion conditions with a catalyst comprising the molecular sieve of claim 1 .
18 . A process of ion exchanging metals, the process comprising contacting a stream comprising heavy metals with the molecular sieve of claim 1 .