# US 12,215,036 B2 · Amorphous silica-alumina composition and method for making the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,215,036 B2
- Document ID: US12215036B2
- Status: Granted
- Kind: B2
- Application number: 18/344,530
- Filed: 2023-06-29
- Published: 2023-11-02
- Granted: 2025-02-04
- Earliest claimed: 2020-11-16
- Assignees: Chevron U.S.A. Inc.
- Applicants: Chevron U.S.A. Inc.
- Inventors: Kandaswamy Jothimurugesan; Hye-Kyung Timken
- Web page: https://patentgrep.com/patent/US12215036B2

## CPC

- C01F 7/34: Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
- B01J 21/12: Silica and alumina
- B01J 35/615: {100-500 m2/g}
- B01J 35/638: {more than 1.0 ml/g}
- B01J 35/647: {2-50 nm}
- B01J 37/0045: {Drying a slurry, e.g. spray drying}
- B01J 37/031: {Precipitation}
- B01J 37/033: {Using Hydrolysis}
- B01J 37/036: {to form a gel or a cogel}
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/06: Washing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/30: Ion-exchange
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2006/12: Surface area
- C01P 2006/14: Pore volume
- C01P 2006/16: Pore diameter
- C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00})
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

A process of making a silica-alumina composition having improved properties is provided. The process includes (a) mixing an aqueous solution of a silicon compound and an aqueous solution of an aluminum compound and an acid, while maintaining a pH of the mixed solution in a range of 1 to 3, and obtaining an acidified silica-alumina sol; (b) adding an aqueous solution of a base precipitating agent to the acidified silica-alumina sol to a final pH in a range of 5 to 8, and co-precipitating a silica-alumina slurry, wherein the base precipitating agent is selected from ammonium carbonate, ammonium bicarbonate, and any combination thereof; (c) optionally, hydrothermally aging the silica-alumina slurry to form a hydrothermally aged silica-alumina slurry; and (d) recovering a precipitate solid from the silica-alumina slurry or the hydrothermally aged silica-alumina slurry, wherein the precipitate solid comprises the silica-alumina composition.

## Claims

### Claim 1

A silica-alumina composition comprising amorphous silica-alumina having a total pore volume of at least 1.0 cm3/g; wherein the silica-alumina composition, in its dried form, contains from 5 wt. % to 30 wt. % of a crystalline phase which is ammonium aluminum carbonate hydroxide.

### Claim 2 (depends on 1)

The silica-alumina composition of claim 1, wherein the amorphous silica-alumina has a pore volume in a range of from 1.0 cm3/g to 2.0 cm3/g.

### Claim 3 (depends on 1)

The silica-alumina composition of claim 1, wherein the silica-alumina composition, in its dried form, contains from 5 wt. % to 20 wt. % of a crystalline phase which is ammonium aluminum carbonate hydroxide.

### Claim 4 (depends on 1)

The silica-alumina composition of claim 1, wherein the silica-alumina composition, in its dried form, contains from 5 to 15 wt. % of a crystalline phase which is ammonium aluminum carbonate hydroxide.

### Claim 5 (depends on 1)

The silica-alumina composition of claim 1, wherein the amorphous silica-alumina has a silica content in a range of from 20 wt. % to 80 wt. % and an alumina content in a range of from 20 wt. % to 80 wt. %.

### Claim 6 (depends on 1)

The silica-alumina composition of claim 1, wherein the amorphous silica-alumina has a B.E.T. surface area in a range of from 300 m2/g to 500 m2/g.

### Claim 7 (depends on 1)

The silica-alumina composition of claim 1, wherein the amorphous silica-alumina composition has a mesopore volume of at least 0.7 cm3/g.

### Claim 8 (depends on 1)

The silica-alumina composition of claim 1, wherein amorphous silica-alumina composition has a porosity such that a volume of mesopores with a diameter in a range of from 200 Å to 500 Å represents 30% to 80% of the total pore volume measured by nitrogen physisorption.