# US 2019/0169093 A1 · Catalyst and Process for Olefin Metathesis Reaction

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- Number: US 2019/0169093 A1
- Document ID: US20190169093A1
- Status: Published application
- Kind: A1
- Application number: 16/269,296
- Filed: 2019-02-06
- Published: 2019-06-06
- Earliest claimed: 2013-10-15
- Assignees: Borealis AG
- Applicants: Borealis AG
- Inventors: Mariana Stoyanova; Evgeny Kondratenko; David Linke; Eberhard Ernst
- Web page: https://patentgrep.com/patent/US20190169093A1

## CPC

- C07C 6/04: at a carbon-to-carbon double bond
- B01J 21/08: Silica
- B01J 21/10: Magnesium; Oxides or hydroxides thereof
- B01J 23/02: of the alkali- or alkaline earth metals or beryllium
- B01J 23/28: Molybdenum
- B01J 23/30: Tungsten
- B01J 35/19: {Catalysts containing parts with different compositions}
- B01J 35/40: characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77)
- B01J 35/45: Nanoparticles
- B01J 35/613: {10-100 m2/g}
- B01J 35/615: {100-500 m2/g}
- B01J 35/633: {less than 0.5 ml/g}
- B01J 35/635: {0.5-1.0 ml/g}
- B01J 35/647: {2-50 nm}
- B01J 35/70: characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00)
- B01J 35/77: Compounds characterised by their crystallite size
- B01J 37/08: Heat treatment {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/14: with gases containing free oxygen
- B01J 37/16: Reducing
- B01J 37/18: with gases containing free hydrogen
- B01J 37/0027: {Powdering}
- B01J 37/04: Mixing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/12: Oxidising
- B01J 2231/52: Isomerisation reactions
- B01J 2231/543: alkene metathesis
- B01J 2235/15: X-ray diffraction
- C07C 2521/08: Silica
- C07C 2521/10: Magnesium; Oxides or hydroxides thereof
- C07C 2523/02: of the alkali- or alkaline earth metals or beryllium
- C07C 2523/04: Alkali metals
- C07C 2523/30: Tungsten
- Y02P 20/52: using catalysts, e.g. selective catalysts
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to the use of magnesium oxide (MgO) as catalyst for isomerisation of olefins with defined physical properties, a catalyst for olefin metathesis comprising said MgO and a process for olefin metathesis using said catalyst.

## Claims

### Claim 1

A catalyst for conversion of olefins comprising a mixture of:
at least one first catalyst component comprising a metathesis catalyst, and
at least one second catalyst component comprising a magnesium oxide (MgO) as a catalyst for double bond isomerisation, wherein the magnesium oxide (MgO) comprises:
a specific surface area BET of 105 to 300 m2/g;
a crystallite size of 5 to 25 nm;
a total pore volume of 0.1 to 0.5 cm3/g; and
a maximum of pore size distribution of 5 to 15 nm,
wherein the magnesium oxide (MgO) is free of a structure stabilizing agent; and
wherein the magnesium oxide is obtained from magnesium carbonate hydroxide of the formula (MgCO3)4.Mg(OH)2.5H2O by calcination in the presence of an oxygen-containing gas.

### Claim 2 (depends on 1)

The catalyst according to claim 1, wherein the catalyst comprises the MgO as isomerisation catalyst component and the at least one metathesis catalyst component in a weight ratio between 5:1 and 1:1.

### Claim 3 (depends on 1)

The catalyst according to claim 1, wherein the catalyst comprises the MgO as isomerisation catalyst component and the at least one metathesis catalyst component in a weight ratio between 4:1 and 2:1.

### Claim 4 (depends on 1)

The catalyst according to claim 1, wherein the catalyst comprises the MgO as isomerisation catalyst component and the at least one metathesis catalyst component in a weight ratio of 3:1.

### Claim 5 (depends on 1)

The catalyst according to claim 1, wherein the metathesis catalyst comprises oxides of metals of the 6th and 7th group of the periodic system of the elements (PSE), in particular at least one of tungsten oxide, molybdenum oxide or a precursor thereof, deposited on at least one inorganic carrier.

### Claim 6 (depends on 1)

The catalyst according to claim 1, wherein the magnesium oxide is additionally arranged as a pre-bed upstream of the catalyst mixture of metathesis catalyst and isomerisation catalyst.

### Claim 7 (depends on 6)

The catalyst according to claim 6, characterized in that the mass ratio of the pre-bed and the main catalyst bed being a mixture of metathesis catalyst and isomerisation catalyst is between 1:10 and 3:1

### Claim 8 (depends on 6)

The catalyst according to claim 6, characterized in that the mass ratio of the pre-bed and the main catalyst bed being a mixture of metathesis catalyst and isomerisation catalyst is between 1:6 and 2:1.

### Claim 9 (depends on 6)

The catalyst according to claim 6, characterized in that the mass ratio of the pre-bed and the main catalyst bed being a mixture of metathesis catalyst and isomerisation catalyst is between 1:4 and 1:2.

### Claim 10 (depends on 1)

The catalyst according to claim 1, wherein the catalyst is activated in a process comprising the steps of:
heating the catalyst in an inert gas atmosphere to a temperature between 300° C. and 500° C.;
oxidizing the catalyst in an oxygen containing atmosphere at temperatures between 400° C. and 600° C.;
reducing the catalyst in a hydrogen containing atmosphere at temperatures between 300° C. and 500° C.;
heating the catalyst in an inert gas atmosphere at temperatures between 400° C. and 600° C.; and
subsequently cooling down the catalyst in an inert gas atmosphere.

### Claim 11 (depends on 1)

The catalyst of claim 1, wherein the specific surface area BET of magnesium oxide is 105 to 150 m2/g.

### Claim 12 (depends on 1)

The catalyst of claim 1, wherein the specific surface area BET of magnesium oxide is 105 to 120 m2/g.

### Claim 13 (depends on 1)

The catalyst of claim 1, wherein the specific surface area BET of magnesium oxide is 105 to 115 m2/g.

### Claim 14 (depends on 1)

The catalyst according to claim 1, wherein the crystallite size of magnesium oxide is 10 to 20 nm.

### Claim 15 (depends on 1)

The catalyst according to claim 1, wherein the crystallite size of magnesium oxide is 10 to 15 nm.

### Claim 16 (depends on 1)

The catalyst according to claim 1, wherein the total pore volume of magnesium oxide is 0.2 to 0.4 cm3/g.

### Claim 17 (depends on 1)

The catalyst according to claim 1, wherein the total pore volume of magnesium oxide is 0.3 to 0.4 cm3/g.

### Claim 18 (depends on 1)

The catalyst according to claim 1, wherein the maximum of pore size distribution of magnesium oxide is 7 to 10 nm.

### Claim 19 (depends on 1)

The catalyst according to claim 1, wherein the maximum of pore size distribution of magnesium oxide is 8 to 9 nm.

### Claim 20

A process for obtaining an olefin, in particular propene, comprising the steps of:
feeding at least two olefins as starting material, to a reactor, in particular a fixed-bed reactor, comprising at least one catalyst for conversion of olefins comprising a mixture of:
at least one first catalyst component comprising a metathesis catalyst; and
at least one second catalyst component comprising a magnesium oxide (MgO) as a catalyst for double bond isomerisation, wherein the magnesium oxide (MgO) comprises:
a specific surface area BET of 105 to 300 m2/g;
a crystallite size of 5 to 25 nm;
a total pore volume of 0.1 to 0.5 cm3/g; and
a maximum of pore size distribution of 5 to 15 nm,
wherein the magnesium oxide (MgO) is free of a structure stabilizing agent; and
wherein the magnesium oxide is obtained from magnesium carbonate hydroxide of the formula (MgCO3)4.Mg(OH)2.5H2O by calcination in the presence of an oxygen-containing gas; and,
converting the at least two olefin gases at a pressure between 1 to 50 bar and a temperature between 100 and 600° C. to obtain at least one new olefin.