Laves phase intermetallic compound, catalyst using intermetallic compound, and method for producing ammonia

Patent metadata

Field	Value
Publication number	US-10695751-B2
Application number	US-201615760072-A
Country	US
Kind code	B2
Filing date	Sep 15, 2016
Priority date	Sep 15, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

The invention provides a Laves phase intermetallic compound having a composition represented by general formula ARu2 (A is Y, Sc, or at least one element selected from lanthanoid elements excluding Ce), the crystallite size thereof being 1 nm to 100 nm; a catalyst including the intermetallic compound as an active ingredient; and a method for producing ammonia using the same.

First claim

The invention claimed is:

1. A Laves phase intermetallic compound having a composition represented by formula ARu 2 ,
wherein
A is Y, Sc, or at least one lanthanoid element excluding Ce; and
a crystallite size of the Laves phase intermetallic compound is 1 nm to 100 nm.

2. A Laves phase intermetallic compound complex, comprising
the Laves phase intermetallic compound according to claim 1 , and
a catalyst support for supporting the intermetallic compound.

3. A catalyst, comprising a Laves phase intermetallic compound having a composition represented by formula ARu 2 , as a catalyst active component,
wherein
A is Y, Sc, or at least one lanthanoid element excluding Ce; and
a crystallite size of the Laves phase intermetallic compound is 1 nm to 100 nm.

4. The catalyst according to claim 3 , wherein the catalyst active component is supported on a catalyst support.

5. The catalyst according to claim 3 , wherein the catalyst is a catalyst for producing ammonia.

6. A method for producing ammonia, the method comprising:
passing a gas containing hydrogen and nitrogen into contact with a catalyst,
wherein
the catalyst comprises a Laves phase intermetallic compound having a composition represented by formula ARu 2 as a catalyst active component;
A is Y, Sc, or at least one lanthanoid element excluding Ce; and
a crystallite size of the Laves phase intermetallic compound is 1 nm to 100 nm.

7. The method according to claim 6 , wherein a reaction temperature of passing the gas into contact with the catalyst is 200° C. or more.

8. The method according to claim 6 , wherein a reaction pressure of passing the gas into contact with the catalyst is 10 kPa to 15 MPa.

9. The method according to claim 6 , wherein a volume ratio of hydrogen to nitrogen in the gas is 0.4 or more.

10. A powder comprising a Laves phase intermetallic compound having a composition represented by formula ARu 2 ,
wherein A is Y, Sc, or at least one lanthanoid element excluding Ce; and
a crystallite size of the Laves phase intermetallic compound is 1 nm to 100 nm.

Assignees

• Japan Science & Tech Agency
• Tokyo Inst Tech

Inventors

• Hosono Hideo
• Yokoyama Toshiharu
• Kitano Masaaki
• Mizoguchi Hiroshi
• Ogawa Takaya

Classifications

• B01J35/45

  Nanoparticles · CPC title

• B01J35/40

  characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77) · CPC title

• B01J37/0081

  Preparation by melting · CPC title

• C22C5/04

  Alloys based on a platinum group metal · CPC title

• Y02P20/52

  using catalysts, e.g. selective catalysts · CPC title