Multicomponent solid solution microparticles and method for producing same, and catalyst

• US 10,639,723 B2
• Filed: 03/01/2017
• Issued: 05/05/2020
• Est. Priority Date: 03/03/2016
• Status: Active Grant

• Current Assignee: Kyoto University
• Original Assignee: Kyoto University
• Inventors: Kitagawa, Hiroshi, Kusada, Kohei, Wu, Dongshuang
• Primary Examiner(s): Vanoy, Timothy C
• Application Number:
  US16/081,916
• Publication Number:
  US 20200001370A1
• Time in Patent Office: 1,161 Days
• CPC Class Codes: B01D 2255/1021 Platinum
• CPC Class Codes: B01D 2255/1023 Palladium
• CPC Class Codes: B01D 2255/1025 Rhodium
• CPC Class Codes: B01D 2255/1026 Ruthenium
• CPC Class Codes: B01D 2255/1028 Iridium
• CPC Class Codes: B01D 2255/104 Silver
• CPC Class Codes: B01D 2255/106 Gold
• CPC Class Codes: B01D 2255/20761 Copper
• CPC Class Codes: B01D 53/864 Removing carbon monoxide or hydrocarbons
• CPC Class Codes: B01D 53/8646 Simultaneous elimination of the components B01D53/8656 takes precedence
• CPC Class Codes: B01D 53/944 Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts three-way-catalysts [TWC] B01D53/9445
• CPC Class Codes: B01D 53/9445 Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
• CPC Class Codes: B01J 23/462 Ruthenium
• CPC Class Codes: B01J 23/464 Rhodium
• CPC Class Codes: B01J 35/0013 Colloids
• CPC Class Codes: B01J 35/002 Catalysts characterised by their physical properties
• CPC Class Codes: B01J 35/006 metal crystallite size
• CPC Class Codes: B01J 35/023 Catalysts characterised by dimensions, e.g. grain size
• CPC Class Codes: B01J 35/026 Form of the solid particles B01J35/08 takes precedence
• CPC Class Codes: B01J 35/23 in a colloidal state
• CPC Class Codes: B01J 35/30 : characterised by their physical properties
• CPC Class Codes: B01J 35/393 : Metal or metal oxide crystallite size
• CPC Class Codes: B01J 35/40 : characterised by dimensions, e.g. grain size in a colloidal state B01J35/23; crystallite size B01J35/77
• CPC Class Codes: B01J 35/50 : characterised by their shape or configuration
• CPC Class Codes: B01J 37/0009 : Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
• CPC Class Codes: B01J 37/031 : Precipitation
• CPC Class Codes: B01J 37/04 : Mixing B01J37/0009, B01J37/0018 take precedence
• CPC Class Codes: B22F 1/00 : Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
• CPC Class Codes: B22F 1/054 : Nanosized particles
• CPC Class Codes: B22F 1/18 : Non-metallic particles coated with metal
• CPC Class Codes: B22F 9/24 : starting from liquid metal compounds, e.g. solutions
• CPC Class Codes: C22C 1/0466 : Alloys based on noble metals
• CPC Class Codes: C22C 5/04 : Alloys based on a platinum group metal
• CPC Class Codes: F01N 2330/00 : Structure of catalyst support or particle filter
• CPC Class Codes: F01N 2330/30 : Honeycomb supports characterised by their structural details
• CPC Class Codes: F01N 2370/02 : used in catalytic reactors
• CPC Class Codes: F01N 2510/06 : for exhaust purification, e.g. catalytic reaction
• CPC Class Codes: F01N 3/10 : by thermal or catalytic conversion of noxious components of exhaust by using other chemical processes, chemical aspects of catalytic conversion, e.g. using specified catalysts, B01D53/34
• CPC Class Codes: F01N 3/101 : Three-way catalysts
• CPC Class Codes: F01N 3/2803 : characterised by structure, by material or by manufacturing of catalyst support

Abstract

This invention provides a multinary solid solution fine particle represented by Pd_xRu_yM_z (M is at least one member selected from the group consisting of Rh, Pt, Cu, Ag, Au and Ir. x+y+z=1, x+y=0.01 to 0.99, z=0.99 to 0.01, x:y=0.1:0.9 to 0.9:0.1), a method for producing the same, and a supported catalyst.

Claims

1. A multinary solid solution fine particle represented by Pd_xRu_yM_z, wherein M is at least one member selected from the group consisting of Rh, Pt, Cu, and Ir, and wherein x+y+z=1, x+y=0.01 to 0.99, z=0.99 to 0.01, and x:

y=0.1;

0.9 to 0.9;

0.1.

2. The multinary solid solution fine particle according to claim 1, wherein M is one or two members selected from the group consisting of Rh, Pt, Cu, and Ir.

3. The multinary solid solution fine particle according to claim 1, wherein M is represented by M¹_pM²_q, wherein M¹ and M² are different from each other and each is selected from the group consisting of Rh, Pt, Cu, and Ir, and wherein p=0.01 to 0.99, q=0.99 to 0.01, and p+q=1.

4. The multinary solid solution fine particle according to claim 1, wherein M¹ and M² are any one of a combination of Ir and Rh, a combination of Ir and Pt, or a combination of Rh and Pt.

5. The multinary solid solution fine particle according to claim 1, wherein M is Rh.

6. The multinary solid solution fine particle according to claim 1, wherein x+y=0.05 to 0.95, z=0.95 to 0.05, and x:

y=0.15;

0.85 to 0.85;

0.15.

7. The multinary solid solution fine particle according to claim 1, wherein x+y=0.1 to 0.9, z=0.9 to 0.1, and x:

y=0.2;

0.8 to 0.8;

0.2.

8. A catalyst comprising the multinary solid solution fine particle according to claim 1.

9. A supported catalyst comprising the catalyst according to claim 8, and a carrier, the catalyst being supported on the carrier.

10. The supported catalyst according to claim 9, wherein the carrier is a carrier including an oxide.

11. The supported catalyst according to claim 9, the supported catalyst being a catalyst for purification of exhaust gas.

12. A method for producing the multinary solid solution fine particle according to claim 1, the method comprising adding an aqueous solution containing:

at least one member selected from the group consisting of an Rh compound, a Pt compound, a Cu compound, and an Ir compound;

a Pd compound; and

a Ru compound to a liquid reducing agent heated to 150°

C. to 250°

C. to cause reaction thereamong.

13. A method for producing the supported catalyst according to claim 9, the method comprising adding an aqueous solution containing:

at least one member selected from the group consisting of an Rh compound, a Pt compound, a Cu compound, and an Ir compound;

a Pd compound; and

a Ru compound, and a carrier to a liquid reducing agent heated to 150°

C. to 250°

C. to cause reaction thereamong.

14. The method according to claim 13, wherein the carrier is a carrier including an oxide.

15. The multinary solid solution fine particle according to claim 1, wherein M is Ir.