Transition-metal-supporting intermetallic compound, supported metallic catalyst, and ammonia producing method

Patent metadata

Field	Value
Publication number	US-10792645-B2
Application number	US-201616065381-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 25, 2015
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

An electride, which is more stable and can be more easily obtained, is provided or is made available, and as a result, a catalyst particularly useful for chemical synthesis, in which the electride is particularly used, is provided. A transition metal-supporting intermetallic compound having a transition metal supported on an intermetallic compound represented by the following formula (1): A5X3 . . . (1) wherein A represents a rare earth element, and X represents Si or Ge.

First claim

The invention claimed is:

1. A transition metal-supporting intermetallic compound having a transition metal supported on an intermetallic compound represented by the following formula (1):
A 5 X 3   (1)

wherein:
A represents a rare earth element; and
X represents Si or Ge,
wherein a ratio of the transition metal to the intermetallic compound is 0.1% by mass or more and 30% by mass or less.

2. The transition metal-supporting intermetallic compound according to claim 1 , wherein the work function of the intermetallic compound is 3.0 eV or more and 4.0 eV or less.

3. The transition metal-supporting intermetallic compound according to claim 1 , wherein the transition metal is at least one selected from the group consisting of transition metals of group 8, group 9 and group 10 of the periodic table.

4. A supported metallic catalyst, comprising the transition metal-supporting intermetallic compound according to claim 1 .

5. A method for producing ammonia, the method comprising contacting a supported metallic catalyst with a mixed gas of hydrogen and nitrogen,
wherein the supported metallic catalyst comprises a transition metal-supporting intermetallic compound, and
the transition metal-supporting intermetallic compound has a transition metal supported on an intermetallic compound represented by the following formula (1):
A 5 X 3   (1),

wherein:
A represents a rare earth element; and
X represents Si or Ge.

6. The method according to claim 5 , wherein a reaction temperature applied when the supported metallic catalyst is contacted with the mixed gas is 200° C. or higher and 600° C. or lower.

7. The method according to claim 5 , wherein a reaction pressure applied when the supported metallic catalyst is brought in contact with the mixed gas is 0.01 MPa or more and 20 MPa or less.

8. The transition metal-supporting intermetallic compound according to claim 1 , wherein the transition metal is an elemental transition metal.

Assignees

• Japan Science & Tech Agency
• Tokyo Inst Tech

Inventors

• Hosono Hideo
• Kitano Masaaki
• Tada Tomofumi
• Yokoyama Toshiharu
• Toda Yoshitake
• Lu Yangfan
• Li Jiang

Classifications

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/15

  X-ray diffraction · CPC title

• B01J23/624

  with germanium · CPC title

• B01J37/0207

  Pretreatment of the support · CPC title

• C01C1/04

  Preparation of ammonia by synthesis (preparation or purification of gas mixtures for ammonia synthesis C01B3/025) · CPC title