Zeolite SSZ-52x
AssigneeChevron U.S.A. Inc.
InventorTracy Davis
Life of this patent
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Abstract
The present invention relates to new crystalline zeolite SSZ-52x prepared using a quaternary ammonium cation templating agent, for example, having the structure: wherein X− is an anion which is not detrimental to the formation of the SSZ-52x. SSZ-52x is useful as a catalyst and shows improved durability, particularly with regard to NOx conversion.
Claims17
A method of preparing a crystalline material comprising an oxide selected from silicon oxide, germanium oxide and mixtures thereof to an oxide selected from aluminum oxide, gallium oxide, iron oxide, and mixtures thereof, said method comprising contacting under crystallization conditions sources of said oxides and a templating agent comprising a quaternary ammonium cation having the structure
- where X− is an anion which is not detrimental to the formation of the crystalline material, in a reaction mixture having the composition
- YO2/W2O3
- 15-60
- OH−/YO2
- 0.30-1.0
- Q/YO2
- 0.01-0.05
- M2/n/YO2
- 0.51-0.90
- H2O/YO2
- 15-50.
A method of preparing a crystalline material comprising an oxide selected from silicon oxide, germanium oxide and mixtures thereof to an oxide selected from aluminum oxide, gallium oxide, iron oxide, and mixtures thereof, said method comprising contacting under crystallization conditions sources of said oxides and a templating agent comprising a quaternary ammonium cation having a structure selected from
- where X− is an anion which is not detrimental to the formation of the crystalline material, in a reaction mixture having the composition
- YO2/W2O3
- 15-60
- OH−/YO2
- 0.30-1.0
- Q/YO2
- 0.01-0.05
- M2/n/YO2
- 0.51-0.90
- H2O/YO2
- 15-50.
A method of preparing a crystalline material SSZ-52x comprising:
- (a) preparing an aqueous solution containing sources of at least one oxide capable of forming a crystalline molecular sieve and a templating agent, or mixture of templating agents comprised of structures
- where X− is an anion which is not detrimental to the formation of the crystalline material, in a reaction mixture having the composition
- YO2/W2O3
- 15-60
- OH−/YO2
- 0.30-1.0
- Q/YO2
- 0.01-0.05
- M2/n/YO2
- 0.51-0.90
- H2O/YO2
- 15-50
- (b) maintaining the aqueous solution under conditions sufficient to form crystals of SSZ-52x;
- and
- (c) recovering the crystals of SSZ-52x.
Dependencies are inferred from the claim text.