# US 2022/0032272 A1 · Catalyst for dehydration reaction of primary alcohols, method for preparing the same and method for preparing alpha-olefins using the same

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- Number: US 2022/0032272 A1
- Document ID: US20220032272A1
- Status: Published application
- Kind: A1
- Application number: 17/386,555
- Filed: 2021-07-28
- Published: 2022-02-03
- Earliest claimed: 2020-07-31
- Assignees: Korea Institute of Energy Research
- Applicants: Korea Institute of Energy Research
- Inventors: Kee Young KOO; Un-ho JUNG; Young-eun KIM; HYO BEEN IM; DONG-HYUN CHUN; Min Hye YOUN; Heon-do JEONG; GEUN BAE RHIM; Ji-chan PARK; Dong-wook LEE
- Web page: https://patentgrep.com/patent/US20220032272A1

## CPC

- B01J 23/02: of the alkali- or alkaline earth metals or beryllium
- B01J 21/04: Alumina
- B01J 35/615: {100-500 m2/g}
- B01J 35/633: {less than 0.5 ml/g}
- B01J 35/70: characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00)
- B01J 37/0201: {Impregnation}
- B01J 37/0207: {Pretreatment of the support}
- B01J 37/0236: {Drying, e.g. preparing a suspension, adding a soluble salt and drying}
- B01J 37/088: {Decomposition of a metal salt}
- C07C 1/24: by elimination of water
- B01J 35/51: Spheres
- B01J 2235/15: X-ray diffraction
- C07C 2521/04: Alumina
- C07C 2523/02: of the alkali- or alkaline earth metals or beryllium
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

Provided are a catalyst for dehydration reaction of a primary alcohol, a method for preparing the same, and a method for preparing alpha-olefins using the same. According to the present invention, there is provided a catalyst for dehydration reaction of primary alcohols capable of adjusting the strength and distribution of Lewis acid sites (LASs) on a surface of an alumina catalyst to realize high selectivity to alpha-olefins as well as a high conversion rate in the dehydration reaction of primary alcohols. Therefore, high-purity alpha-olefins having a low isomeric yield fraction as well as a high conversion rate can be produced from the primary alcohols.

## Claims

### Claim 1

A catalyst for a dehydration reaction of a primary alcohol, wherein 0.1 to 1.5% by weight of barium oxide is supported on an alumina carrier, based on the total weight of the catalyst.

### Claim 2 (depends on 1)

The catalyst of claim 1, wherein the catalyst is used to convert the primary alcohol into an alpha-olefin.

### Claim 3 (depends on 2)

The catalyst of claim 2, wherein the primary alcohol is a primary linear alcohol having 4 to 20 carbon atoms.

### Claim 4 (depends on 3)

The catalyst of claim 3, wherein the primary alcohol is 1-octanol.

### Claim 5 (depends on 1)

The catalyst of claim 1, wherein the alumina carrier is a gamma-alumina carrier, a delta-alumina carrier, a theta-alumina carrier, an eta-alumina carrier, or an alpha-alumina carrier.

### Claim 6 (depends on 1)

A method for preparing the catalyst for a dehydration reaction of a primary alcohol defined in claim 1, comprising:
mixing a barium precursor with an alumina carrier to impregnate the alumina carrier; and
drying and calcining the resulting mixture.

### Claim 7 (depends on 6)

The method of claim 6, wherein the barium precursor is selected from barium nitrate, barium nitrite, barium acetate, barium sulfate, and barium carbonate.

### Claim 8

A method for preparing an alpha-olefin from a primary alcohol, comprising:
subjecting a primary alcohol to a dehydration reaction while continuously adding the primary alcohol in the presence of a catalyst for a dehydration reaction of a primary alcohol in which 0.1 to 1.5% by weight of barium oxide is supported, based on the total weight of the catalyst.

### Claim 9 (depends on 8)

The method of claim 8, wherein the adding of the primary alcohol comprises supplying the primary alcohol into the catalyst in an evaporated form.

### Claim 10 (depends on 8)

The method of claim 8, wherein the subjecting of the primary alcohol is performed at 250 to 500° C.

### Claim 11 (depends on 10)

The method of claim 10, wherein the subjecting of the primary alcohol comprises supplying the primary alcohol at a liquid hourly space velocity of 4 to 70 h−1.

### Claim 12 (depends on 11)

The method of claim 11, wherein a conversion rate of the primary alcohol is greater than 60%, and
a selectivity of alpha-olefin is greater than 50%.

### Claim 13 (depends on 12)

The method of claim 12, wherein a yield of the alpha-olefin is greater than 40%, and
a purity of the alpha-olefin is greater than 50%.