Crystalline molecular sieves and synthesis thereof

Patent metadata

Field	Value
Publication number	US-10246339-B2
Application number	US-201715649032-A
Country	US
Kind code	B2
Filing date	Jul 13, 2017
Priority date	Jul 23, 2015
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Crystalline molecular sieves and their synthesis using quaternary N-methyl-diisoalkylammonium cations as organic structure directing agents are disclosed. The structure directing agent has the following structure (1):

in which R 1 is selected from hydrogen, a methyl group, an ethyl group, a propyl group, and a hydroxymethyl group; and R 2 , R 3 , R 4 and R 5 are independently selected from a methyl group, an ethyl group, and a propyl group.

First claim

The invention claimed is:

1. A crystalline molecular sieve, wherein the molecular sieve has a framework of SSZ-47 and the three-dimensional framework comprising oxides of silicon and aluminum, comprising within its pore structure N,N-dimethyl-di-sec-butylammonium cation.

2. A method of synthesizing the crystalline molecular sieve of claim 1 , the method comprising subjecting to crystallization conditions one or more sources of oxides silicon and aluminum in the presence of fluoride ions, water, and N,N-dimethyl-di-sec-butylammonium cations.

3. The method of claim 2 , wherein the molecular sieve is formed from a reaction mixture having the composition, in terms of mole ratios, as follows:

SiO 2 /Al 2 O 3
≤5

Q/SiO 2
0.10 to 1.0 

F/SiO 2
0.2 to 1.5

H 2 O/SiO 2
 1 to 10

wherein Q comprises N,N-dimethyl-di-sec-butylammonium cations.

4. The method of claim 2 , wherein the molecular sieve is formed from a reaction mixture having the composition, in terms of mole ratios, as follows:

SiO 2 /Al 2 O 3
 5 to 200

Q/SiO 2
0.15 to 0.40

F/SiO 2
0.30 to 0.60

H 2 O/SiO 2
 2 to 10

wherein Q comprises N,N-dimethyl-di-sec-butylammonium cations.

5. The method of claim 2 , wherein the crystallization conditions include a temperature of from 135° C. to 200° C.

Assignees

• Chevron Usa Inc

Inventors

• Zones Stacey Ian

Classifications

• B01J29/70

  of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 · CPC title

• B01J20/18

  Synthetic zeolitic molecular sieves · CPC title

• C01B39/04 Primary

  using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound · CPC title

• C01B37/02

  Crystalline silica-polymorphs, e.g. silicalites {dealuminated aluminosilicate zeolites} · CPC title

• C01B39/00

  Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination (treatment to modify the sorption properties, e.g. shaping using a binder, B01J20/10; treatment to modify the catalytic properties, e.g. combination of treatments to make the zeolites appropriate to their use as a catalyst, B01J29/04; treatment to improve the ion-exchange properties B01J39/14) · CPC title