# US 2022/0033271 A1 · Low pressure synthesis of zeolite ssz-13

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- Number: US 2022/0033271 A1
- Document ID: US20220033271A1
- Status: Published application
- Kind: A1
- Application number: 17/372,660
- Filed: 2021-07-12
- Published: 2022-02-03
- Earliest claimed: 2020-08-03
- Assignees: Chevron U.S.A. Inc.
- Applicants: Chevron U.S.A. Inc.
- Inventors: Stacey Ian ZONES
- Web page: https://patentgrep.com/patent/US20220033271A1

## CPC

- C01B 39/026: {After-treatment}
- C01B 39/48: using at least one organic template directing agent
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}

## Abstract

A method is described for the synthesis of aluminosilicate CHA framework type molecular sieves at ambient pressure via interzeolite conversion from FAU framework type zeolites.

## Claims

### Claim 1

A method of synthesizing a molecular sieve of CHA framework type, the method comprising the steps of:
(1) preparing a reaction mixture comprising:
(a) a source of silicon and aluminum, where the source of both silicon and aluminum is a zeolite of FAU framework type;
(b) a source of an alkali or alkaline earth metal (M);
(c) a CHA structure directing agent (Q);
(d) a source of hydroxide ions; and
(e) water; and
(2) heating the reaction mixture at ambient pressure and at a temperature of from 50° C. to 90° C. until crystals of the molecular sieve are formed.

### Claim 2 (depends on 1)

The method of claim 1, wherein the reaction mixture has a composition, in terms of molar ratios, as follows:
SiO2/Al2O3
≥20
M/SiO2
0.05 to 1.00
Q/SiO2
0.05 to 0.50
OH/SiO2
0.05 to 1.00
H2O/SiO2
5 to 80.

### Claim 3 (depends on 1)

The method of claim 1, wherein the reaction mixture has a composition, in terms of molar ratios, as follows:
SiO2/Al2O3
30 to 100
M/SiO2
0.10 to 0.70
Q/SiO2
0.05 to 0.20
OH/SiO2
0.10 to 0.70
H2O/SiO2
10 to 60.

### Claim 3 (depends on 1)

The method of claim 1, wherein the zeolite of FAU framework type is zeolite Y.

### Claim 4 (depends on 1)

The method of claim 1, wherein the zeolite of FAU framework type has a molar ratio of SiO2/Al2O3 in a range of from 20 to 500.

### Claim 5 (depends on 1)

The method of claim 1, wherein the zeolite of FAU framework type has a molar ratio of SiO2/Al2O3 in a range of from 30 to 100.

### Claim 6 (depends on 1)

The method of claim 1, wherein the reaction mixture is free of a separate source of silicon.

### Claim 7 (depends on 6)

The method of claim 6, wherein the separate source of silicon is selected from the group consisting of colloidal suspensions of silica, fumed silicas, precipitated silicas, alkali metal silicates, tetraalkyl orthosilicates, and any combination thereof.

### Claim 8 (depends on 1)

The method of claim 1, wherein the alkali or alkaline earth metal (M) comprises sodium.

### Claim 9 (depends on 1)

The method of claim 1, wherein the CHA framework structure directing agent comprises one or more of a N-alkyl-3-quinuclidinol, a N,N,N-trialkylexoaminonorbornane, a N,N,N-trimethyl-1-adamantylammonium compound, a N,N,N-trimethyl-2-adamantyl-ammonium compound, a N,N,N-trimethylcyclohexylammonium compound, a N,N-dimethyl-3,3-dimethylpiperidinium compound, a N,N-methylethyl-3,3-dimethylpiperidinium compound, a N,N-dimethyl-2-methylpiperidinium compound, 1,3,3,6,6-pentamethyl-6-azonio-bicyclo[3.2.1]octane, N,N-dimethylcyclohexylamine, and a N,N,N-trimethylbenzylammonium compound.

### Claim 10 (depends on 1)

The method of claim 1, wherein the ambient pressure is in a range of from 0.9 to 1.1 bar (90 to 110 kPa).

### Claim 11 (depends on 1)

The method of claim 1, wherein the temperature is in a range of from 50° C. to 75° C.

### Claim 12 (depends on 1)

The method of claim 1, wherein step (2) is performed in an open reaction vessel.

### Claim 13 (depends on 1)

The method of claim 1, wherein step (2) is performed under static conditions.