Method of producing metal oxyhydride, metal oxyhydride, and method of synthesizing ammonia using same

Patent metadata

Field	Value
Publication number	US-12343704-B2
Application number	US-202017597101-A
Country	US
Kind code	B2
Filing date	Jul 1, 2020
Priority date	Jul 8, 2019
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The invention provides a method of producing a metal oxyhydride, capable of synthesizing the metal oxyhydride under reaction conditions close to atmospheric pressure, and excellent in productivity and cost. The method of producing a metal oxyhydride of the present invention includes reacting an oxide with a metal hydride in a hydrogen atmosphere. A non-oxygen element constituting the oxide comprises only one kind of non-oxygen element. A pressure condition of the reaction is 0.1 to 0.9 MPa, and a temperature of the reaction is 500 to 1000° C.

First claim

What is claimed is:

1. A method of producing a metal oxyhydride by reacting an oxide with a metal hydride in a hydrogen atmosphere,
wherein
a pressure condition of the reaction is 0.1 to 0.9 MPa;
a temperature of the reaction is 500 to 1000° C.;
the oxide is M m O n ,
wherein M is the non-oxygen element and m is 1 or 2; n represents a number of 2 or 3, and
M m O n is selected from the group consisting of Sc 2 O 3 , Y 2 O 3 , LnO 2 , ZrO 2 , TiO 2 ,
SiO 2 , and Al 2 O 3 ;

the metal hydride is AeH 2 ,
wherein Ae is an alkaline earth metal selected from the group consisting of Mg, Ca, Ba, and Sr; and

the metal oxyhydride is a metal oxyhydride represented by general formula (1),
Ae r M p O q-x H y   (1)

wherein Ae is at least one alkaline earth metal selected from the group consisting of Mg, Ca, Ba, and Sr; M is a non-oxygen element selected from the group consisting of Sc, Y, Ln, Zr, Ti, Si, and Al; r is 1 or 2; p is 1 or 2; q is 3 or 4; x represents a number expressed by 0.1≤x≤3.0; and y represents a number expressed by 0.2≤y≤3.0.

2. The method according to claim 1 , the method comprising:
mixing the oxide with the metal hydride to obtain a mixture; and
heating the mixture in a hydrogen atmosphere at a pressure of 0.1 to 0.9 MPa and at a temperature of 500 to 1000° C.

3. The method according to claim 2 , further comprising a pretreatment step of dehydrating the oxide prior to the mixing step.

4. The method according to claim 1 ,
wherein the metal hydride is BaH 2 , and
in the general formula (1), Ae is Ba.

5. The method according to claim 1 ,
wherein a feed molar ratio of the oxide to the metal hydride is from p: 0.5r to p: 2.5r.

Assignees

• Japan Science & Tech Agency

Inventors

• Kitano Masaaki
• Hosono Hideo
• Yokoyama Toshiharu
• OOYA Kayato
• OGASAWARA Kiya
• TAKASHIMA Ryu

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• C01F11/02

  Oxides or hydroxides (production of lime C04B2/00) · CPC title

• C01C1/0411

  characterised by the catalyst · CPC title