Synthesis of zeolite SSZ-31

Patent metadata

Field	Value
Publication number	US-9890051-B2
Application number	US-201715416082-A
Country	US
Kind code	B2
Filing date	Jan 26, 2017
Priority date	Apr 21, 2016
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

A zeolite having the framework structure of SSZ-31 is synthesized using 1-cyclohexylmethyl-1-ethylpiperidinium cations as a structure directing agent.

First claim

The invention claimed is:

1. A method of synthesizing a zeolite having the structure of SSZ-31, the method comprising:
(a) preparing a reaction mixture comprising:
(1) a source of silicon oxide;
(2) optionally, a source of aluminum oxide;
(3) a structure directing agent (Q) comprising 1-cyclohexylmethyl-1-ethylpiperidinium cations;
(4) hydroxide ions; and
(5) water; and

(b) subjecting the reaction mixture to crystallization conditions sufficient to form crystals of the zeolite.

2. The method of claim 1 , wherein the reaction mixture comprises, in terms of molar ratios, the following:

SiO 2 /Al 2 O 3
≧50

Q/SiO 2
0.05 to 0.50

OH/SiO 2
0.05 to 0.50

H 2 O/SiO 2
 10 to 60.

3. The method of claim 1 , wherein the reaction mixture comprises, in terms of molar ratios, the following:

SiO 2 /Al 2 O 3
100 to 500

Q/SiO 2
0.10 to 0.45

OH/SiO 2
0.20 to 0.45

H 2 O/SiO 2
 15 to 50.

4. The method of claim 1 , wherein the crystallization conditions include a temperature of from 125° C. to 200° C.

5. A zeolite having the structure of SSZ-31 and comprising 1-cyclohexylmethyl-1-ethylpiperidinium cations in its pores.

6. The zeolite of claim 5 , wherein the zeolite has, in its as-synthesized and anhydrous form, a composition comprising the following molar relationship:

SiO 2 /Al 2 O 3
≧50

Q/SiO 2
>0 to 0.2

wherein Q comprises 1-cyclohexylmethyl-1-ethylpiperidinium cations.

7. The zeolite of claim 5 , wherein the zeolite has, in its as-synthesized and anhydrous form, a composition comprising the following molar relationship:

SiO 2 /Al 2 O 3
100 to 500

Q/SiO 2
 >0 to 0.1 

wherein Q comprises 1-cyclohexylmethyl-1-ethylpiperidinium cations.

Assignees

• Chevron Usa Inc

Inventors

• Xie Dan

Classifications

• C01B39/026

  After-treatment · CPC title

• C01B39/48 Primary

  using at least one organic template directing agent · CPC title

• B01J20/3057

  Use of a templating or imprinting material (molecularly imprinted polymers B01J20/268); filling pores of a substrate or matrix followed by the removal of the substrate or matrix · CPC title

• 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