# US 2026/0091983 A1 · Use of zinc in synthesis of large-mesopore y zeolite

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- Number: US 2026/0091983 A1
- Document ID: US20260091983A1
- Status: Published application
- Kind: A1
- Application number: 19/220,338
- Filed: 2025-05-28
- Published: 2026-04-02
- Earliest claimed: 2024-09-30
- Assignees: Chevron U.S.A. Inc.; The Regents of the University of California
- Applicants: Chevron U.S.A. Inc.; The Regents of the University of California
- Inventors: Alexander KATZ; Xuemin LI; Jinyi HAN; Axel BRAIT; Bi-Zeng ZHAN; Howard Steven LACHEEN; Alexander E. KUPERMAN
- Web page: https://patentgrep.com/patent/US20260091983A1

## CPC

- C01B 39/24: Type Y {(C01B39/205 takes precedence)}
- C01B 39/026: {After-treatment}
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/85: by XPS, EDX or EDAX data
- C01P 2004/03: obtained by SEM
- C01P 2004/04: obtained by TEM, STEM, STM or AFM
- C01P 2006/14: Pore volume
- C01P 2006/16: Pore diameter
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

Provided is a process for synthesizing mesopores-Y zeolite having mesopores up to about 20 nm in diameter. The process comprises starting with a parent meso-Y zeolite and imposing intimate contact between a zinc species and aluminosilicate of the meso-Y zeolite while calcining. The calcined product is then subjected to a hydrothermal treatment in the presence of a residual amount of the Zn species. The species can comprise ZnO.

## Claims

### Claim 1

A process for preparing a large mesopore meso-Y zeolite comprising:
a) providing a parent meso-Y zeolite and calcining the zeolite together with a zinc species to produce a material with a zincoaluminosilicate phase; and
b) subjecting the material with a zincoaluminosilicate phase to a hydrothermal treatment in the presence of residual zinc species from a) to thereby produce a large mesopore meso-Y zeolite.

### Claim 2 (depends on 1)

The process of claim 1, wherein the zinc species comprises ZnO, a zinc alkoxide or a zinc salt.

### Claim 3 (depends on 1)

The process of claim 1, wherein the zinc species comprises ZnO.

### Claim 4 (depends on 2)

The process of claim 2, wherein the zinc salt comprises Zn(NO3)2.

### Claim 5 (depends on 1)

The process of claim 1, wherein the parent meso-Y zeolite is a meso-Y zeolite that has been treated with a surfactant.

### Claim 6 (depends on 5)

The process of claim 5, wherein the parent meso-Y zeolite is a meso-Y zeolite that has been treated with a surfactant.

### Claim 7 (depends on 6)

The process of claim 6, wherein the CTA surfactant comprises cetyltrimethylammoniumbromide (CTAB).

### Claim 8 (depends on 1)

The process of claim 1, wherein the hydrothermal treatment comprises heating the material in an aqueous acid solution.

### Claim 9 (depends on 8)

The process of claim 8, wherein the concentration of acid in the aqueous solution ranges from about 0.5 M to about 0.30 M.

### Claim 10 (depends on 9)

The process of claim 9, wherein the acid concentration ranges from about 0.01 M to about 0.30 M.

### Claim 11 (depends on 9)

The process of claim 9, wherein the acid concentration ranges from about 0.17 M to about 0.20 M.

### Claim 12 (depends on 1)

The process of claim 1, wherein the amount of zinc species in step a) ranges from about 20 to about 40 wt. % based on the weight of the meso-Y zeolite.

### Claim 13 (depends on 12)

The process of claim 12, wherein the amount of zinc species in step a) is about 30 wt. %.

### Claim 14 (depends on 1)

The process of claim 1, wherein the large mesopore meso-Y zeolite produced in b) is recovered.

### Claim 15 (depends on 14)

The process of claim 14, wherein the recovered large mesopore meso-Y zeolite has mesopores in the range of from 9-16 nm in diameter.

### Claim 16 (depends on 14)

The process of claim 14, wherein the recovered large mesopore meso-Y zeolite has mesopores with a diameter in the range of about 20 nm.

### Claim 17 (depends on 14)

The process of claim 14, wherein the recovered large mesopore meso-Y zeolite has a mesopore volume in the range of from about 0.45 to 0.70 cm3/g.

### Claim 18 (depends on 17)

The process of claim 17, wherein the mesopore volume is above 0.64 cm3/g.

### Claim 19 (depends on 14)

The process of claim 14, wherein the recovered large mesopore meso-Y zeolite is subjected to an acid wash.

### Claim 20 (depends on 19)

The process of claim 19, wherein the acid wash is with aqueous HNO3.

### Claim 21 (depends on 1)

The process of claim 1, wherein the amount of residual zinc species in step b) ranges from about 1 to 25 wt. % of the material.

### Claim 22 (depends on 21)

The process of claim 21, wherein the amount of residual zinc species in step b) ranges from about 5 to 20 wt. % of the material.

### Claim 23 (depends on 1)

A large mesopore meso-Y-zeolite prepared by the process of claim 1.

### Claim 24 (depends on 19)

A large mesopore meso-Y-zeolite prepared by the process of claim 19.