STA-30, a new member of the SWY family of molecular sieves, methods of preparation and use
The present invention is directed to a method of preparing a molecular sieve of SWY framework type, denominated STA-30. STA-30 is synthesized using 1,4-diazabicyclo[2.2.2]octane, 1-azabicyclo[2.2.2]octane derivates and combinations thereof as structure directing agents. The resulting molecular sieve is useful as catalysts, particularly when used in combination with exchanged transition metal(s) for the Selective Catalytic Reduction (SCR) of NO.
1. A molecular sieve comprising a SWY type framework (STA-30), wherein the molecular sieve has a molar relationship: Al 2 O 3 :(n)SiO 2 , wherein n represents the molar ratio of SiO 2 to Al 2 O 3 .
2. The molecular sieve of claim 1 , wherein n is from about 5 to about 50.
3. The molecular sieve of claim 1 , wherein the molecular sieve has at least 95 mol. % of SWY framework.
4. The molecular sieve of claim 1 , wherein the molecular sieve is substantially free of phosphorus within the framework.
5. The molecular sieve of claim 1 , where the molecular sieve further comprises at least one extra-framework transition metal selected from the group consisting of Ag, Ce, Co, Cr, Cu, Fe, Ga, In, Ir, Mn, Mo, Ni, Pd, Pt, Re, Rh, Ru, Sn and Zn.
6. The molecular sieve of claim 1 , where the molecular sieve is calcined.
7. The molecular sieve of claim 1 , where the molecular sieve further comprises one or more SDAs.
8. The molecular sieve of claim 7 , where the SDA comprises one or more 1,4-diazabicyclo[2.2.2]octane and 1-azabicyclo[2.2.2]octane dications derivates.
9. A catalyst comprising an STA-30 molecular sieve of claim 1 .
10. The catalyst of claim 9 , wherein the molecular sieve comprises about 0.1 to about 10 weight percent of a transition metal or noble metal.
11. The catalyst of claim 10 , wherein the transition metal comprises copper and the molecular sieve comprises about 1 to about 5 weight percent ionic copper.
12. The catalyst of claim 10 , wherein the noble metal is selected from the group consisting of Pt, Pd, Ru, Rh, Os, Ir, Ag, and Au.
13. A method for synthesizing an aluminosilicate molecular sieve comprising a SWY type framework (STA-30), the method comprising:
(1) forming heating a reaction mixture comprising: (a) at least one source of silicon oxide; (b) at least one source of aluminum oxide; (c) a source of alkali or alkaline earth metal cations; (d) a source of a structure directing agent (SDA); (e) a source of hydroxide ions; and (f) water;
(2) forming aluminosilicate molecular sieve crystals having an STA-30 framework and the structure directing agent, and
(3) recovering at least a portion of the aluminosilicate molecular sieve crystals from the reaction mixture.
14. The method of claim 13 , wherein the SDA comprises one or more 1,4-diazabicyclo[2.2.2]octane and 1-azabicyclo[2.2.2]octane dications derivates.
15. The method of claim 13 , where the source of hydroxide ions comprise an alkyl quaternary ammonium compound.
16. The method of claim 13 , wherein the reaction mixture has one or more of the following compositional molar ratios:
SiO 2 /Al 2 O 3
10-100
Z 2 O/SiO 2
0.01-1.0
SDA/SiO 2
0.01-0.8
OH/SiO 2 2
0.1-1.0
H 2 O/SiO 2
8-80.
wherein Z represents the alkali metal or alkaline earth metal.
17. A method or treating an exhaust gas comprising contacting a combustion exhaust gas containing NO x and/or NH 3 with a catalyst according to claim 9 to selectively reduce at least a portion of the NO x into N 2 and H 2 O and/or oxidize at least a portion of the NH 3 .
18. A method for treating an exhaust gas comprising contacting a combustion exhaust gas containing NO x with a passive NO x absorber comprising the molecular sieve of claim 1 .
19. A method of converting methanol to an olefin (MTO) comprising contacting methanol with the molecular sieve of according to claim 1 .
20. The molecular sieve of claim 1 , where the molecular sieve further comprises at least one extra-framework transition metal selected from the group consisting of Cu, Fe, Co and Ni.