Noble metal-transition metal complex catalyst supported on carbon-coated silica-alumina support, and preparation method therefor

Patent metadata

Field	Value
Publication number	US-2021061742-A1
Application number	US-201816958430-A
Country	US
Kind code	A1
Filing date	Dec 26, 2018
Priority date	Dec 29, 2017
Publication date	Mar 4, 2021
Grant date	—

Abstract

Provided are a noble metal-transition metal complex catalyst supported on a carbon-coated silica-alumina support and a preparation method therefor, the catalyst being capable of obtaining a fast reaction rate and catalyst stability, as compared to a conventional catalyst, when cyclohexane dimethanol (CHDM) production is carried out by a cyclohexane dicarboxylic acid (CHDA) hydrogenation reaction in an aqueous solution by using a carbon-coated supported catalyst.

First claim

1 . A noble metal-transition metal complex catalyst supported on a carbon-coated silica-alumina carrier, wherein
40 parts by weight to 95 parts by weight of alumina (Al 2 O 3 ) and 5 parts by weight to 60 parts by weight of silica (SiO 2 ) are included based on 100 parts by weight of the entire carrier; and 1 part by weight to 20 parts by weight of the noble metal and the transition metal are included based on 100 parts by weight of the carbon-coated silica-alumina carrier.

2 . The noble metal-transition metal complex catalyst of claim 1 , wherein the noble metal includes one or more selected from the group consisting of palladium (Pd), rhodium (Rh), ruthenium (Ru), and platinum (Pt).

3 . The noble metal-transition metal complex catalyst of claim 1 , wherein an amount of the noble metal is in a range of 1 part by weight to 10 parts by weight based on 100 parts by weight of the carrier.

4 . The noble metal-transition metal complex catalyst of claim 1 , wherein the transition metal includes one or more selected from the group consisting of tin (Sn), iron (Fe), rhenium (Re), and gallium (Ga).

5 . The noble metal-transition metal complex catalyst of claim 1 , wherein an amount of the transition metal is in a range of 1 part by weight to 10 parts by weight based on 100 parts by weight of the carrier.

6 . The noble metal-transition metal complex catalyst of claim 1 , wherein a noble metal precursor and a transition metal precursor are supported on the carrier at the same molar ratio.

7 . The noble metal-transition metal complex catalyst of claim 1 , wherein the carbon is coated on the surface of the silica-alumina through a carbonization process.

8 . A hydrogenation method for hydrogenating a dicarboxylic acid group using the catalyst according to claim 1 .

9 . The hydrogenation method of claim 8 , wherein the dicarboxylic acid is one selected from the group consisting of an oxalic acid, a malonic acid, a succinic acid, a glutaric acid, an adipic acid, a pimelic acid, a suberic acid, an azelaic acid, a sebacic acid, a malic acid, an aspartic acid, a glutamic acid, a phthalic acid, an isopthalic acid, a terephthalic acid, and a cyclohexane dicarboxylic acid.

10 . A cyclohexane dimethanol (CHDM) prepared by performing a hydrogenation reaction of a cyclohexane dicarboxylic acid (CHDA) on the catalyst according to claim 1 .

11 . A method for preparing a noble metal-transition metal complex catalyst supported on a carbon-coated carrier, the method comprising:
(a) preparing a complex by dissolving a boric acid in an aqueous carbon precursor solution and supporting the resultant mixture on silica-alumina (SiO 2 —Al 2 O 3 ); (b) carbonizing the complex; (c) supporting a noble metal-transition metal on a carbon-coated silica-alumina (SiO 2 —Al 2 O 3 ) carrier; and (d) reducing a noble metal-transition metal oxide supported on the silica-alumina (SiO 2 —Al 2 O 3 ) carrier with hydrogen.

12 . The method of claim 11 , wherein, in the step (a), the carbon precursor and the boric acid are added at a weight ratio of 1:0.005 to 1:0.1.

13 . The method of claim 11 , wherein, in the step (a), the complex is prepared by being supported on the carrier by incipient-wetness impregnation.

14 . The method of claim 11 , wherein, in the step (b), the carbonization process is performed in a temperature range of 300° C. to 700° C. in a nitrogen atmosphere.

15 . The method of claim 11 , wherein, in the step (c), the noble metal and the transition metal are supported in 1 part by weight to 20 parts by weight based on 100 parts by weight of the carrier.

16 . The method of claim 11 , wherein, in the step (d), the reduction process is performed in a temperature range of 400° C. to 600° C.

Assignees

• Hanwha Solutions Corp

Inventors

• Kim Jeong Kwon
• Myeong Wan Jae
• Yook Sun Woo
• Jeon Bong Sik

Classifications

• B01J37/086

  Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid · CPC title

• B01J37/084

  Decomposition of carbon-containing compounds into carbon · CPC title

• B01J37/0219

  the coating containing organic compounds · CPC title

• B01J37/0217

  Pretreatment of the substrate before coating · CPC title

• B01J37/0213

  Preparation of the impregnating solution · CPC title