Silver-cerium oxide composite catalyst supported on an alkaline carrier and method for producing the same

Patent metadata

Field	Value
Publication number	US-2016310931-A1
Application number	US-201615135958-A
Country	US
Kind code	A1
Filing date	Apr 22, 2016
Priority date	Apr 24, 2015
Publication date	Oct 27, 2016
Grant date	—

Abstract

Conventionally, a silver-cerium oxide composite containing a silver particle and cerium oxide covering the surface of the silver particle has been synthesized through a multi-stage process, and is disadvantageous not only in that there is a need to use an organic solvent and a surfactant, causing the time and cost to be increased, but also in that there is a possiblity that fulminating silver is formed, leading to a problem about the safety. A method for producing a catalyst having a silver-cerium oxide composite and an alkaline carrier having supported thereon the oxide composite, the silver-cerium oxide composite containing a silver particle and cerium oxide covering the surface of the silver particle, the method having preparing a mixture containing a silver compound, a cerium compound, and an alkaline carrier, and drying the mixture is provided.

First claim

1 . A silver-cerium oxide supported composite catalyst comprising:
a silver-cerium oxide composite and an alkaline carrier having supported thereon the oxide composite, wherein the silver-cerium oxide composite comprises a silver particle and cerium oxide covering the surface of the silver particle.

2 . The silver-cerium oxide supported composite catalyst according to claim 1 , wherein the alkaline carrier comprises at least one metal selected from the group consisting of alkali metals and alkaline earth metals.

3 . The silver-cerium oxide supported composite catalyst according to claim 1 , wherein the alkaline carrier comprises at least magnesium oxide.

4 . The silver-cerium oxide supported composite catalyst according to claim 1 , wherein the silver-cerium oxide composite has a [metal silver (Ag)/cerium oxide (CeO 2 )] molar ratio of 0.25 to 4.0, wherein the [metal silver (Ag)/cerium oxide (CeO 2 )] molar ratio is a ratio of the mole of silver in terms of metal silver in the silver particle to the mole of the cerium oxide.

5 . The silver-cerium oxide supported composite catalyst according to claim 1 , wherein the silver-cerium oxide composite has a core-shell structure.

6 . The silver-cerium oxide supported composite catalyst according to claim 1 , wherein the alkaline carrier comprises hydrotalcite or magnesia.

7 . The silver-cerium oxide supported composite catalyst according to claim 1 in a form suitable for use in selective hydrogenation.

8 . The silver-cerium oxide supported composite catalyst according to claim 7 , wherein the selective hydrogenation is hydrogenation of an oxygen-containing polar functional group which is any one of a nitro group, an aldehyde group, or an epoxy group.

9 . A method for producing a silver-cerium oxide supported composite catalyst which comprises a silver-cerium oxide composite and an alkaline carrier having supported thereon the oxide composite, the silver-cerium oxide composite comprising a silver particle and cerium oxide covering the surface of the silver particle,
the method comprising preparing a mixture containing at least a silver compound, a cerium compound, and an alkaline carrier, and drying the mixture.

10 . The method according to claim 9 , wherein the alkaline carrier comprises at least magnesium oxide.

11 . The method according to claim 9 , wherein the alkaline carrier comprises hydrotalcite or magnesia.

12 . The method according to claim 9 , wherein the mixture containing at least a silver compound, a cerium compound, and an alkaline carrier is prepared by mixing together the silver compound and the cerium compound, and then adding the alkaline carrier to the resultant mixture.

13 . A selective hydrogenation method for an organic compound, comprising selectively hydrogenating an organic compound using the silver-cerium oxide supported composite catalyst according to claim 1 .

14 . The selective hydrogenation method according to claim 13 , wherein the organic compound is a compound having an oxygen-containing polar functional group which is any one of a nitro group, an aldehyde group, or an epoxy group and having a hydrogenation reactive site, wherein the oxygen-containing polar functional group of the compound is selectively hydrogenated.

Assignees

• Univ Osaka
• N E Chemcat Corp

Inventors

• Kaneda Kiyotomi
• Takagi Yukio

Classifications

• B01J35/45

  Nanoparticles · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• C07C29/141

  with hydrogen or hydrogen-containing gases · CPC title

• B01J23/66 Primary

  Silver or gold · CPC title

• B01J35/0006

  Operations & Transport · mapped topic