TOP > 外国特許検索 > Intermetallic compound, hydrogen storage/release material, catalyst and method for producing ammonia

Intermetallic compound, hydrogen storage/release material, catalyst and method for producing ammonia NEW

外国特許コード F210010315
整理番号 J1014-29WO
掲載日 2021年1月29日
出願国 アメリカ合衆国
出願番号 201816630269
公報番号 20200164348
出願日 平成30年7月12日(2018.7.12)
公報発行日 令和2年5月28日(2020.5.28)
国際出願番号 JP2018026287
国際公開番号 WO2019013272
国際出願日 平成30年7月12日(2018.7.12)
国際公開日 平成31年1月17日(2019.1.17)
優先権データ
  • 特願2017-135875 (2017.7.12) JP
  • 2018JP26287 (2018.7.12) WO
発明の名称 (英語) Intermetallic compound, hydrogen storage/release material, catalyst and method for producing ammonia NEW
発明の概要(英語) Provided are an intermetallic compound having high stability and high activity, and a catalyst using the same. A hydrogen storage/release material containing an intermetallic compound represented by formula (1): RTX . . . (1) wherein R represents a lanthanoid element, T represents a transition metal in period 4 or period 5 in the periodic table, and X represents Si, Al or Ge.
従来技術、競合技術の概要(英語) BACKGROUND ART
In the Haber-Bosch process, a typical process for synthesizing ammonia, ammonia is produced by using doubly promoted iron containing Fe3O4 and a few % by mass of Al2O3 and K2O as a catalyst and contacting the catalyst with a mixed gas of nitrogen and hydrogen under a high temperature, high pressure condition.
Meanwhile, studies have been conducted on a process for synthesizing ammonia at a temperature lower than the reaction temperature applied in the Haber-Bosch process, and a study proposes a process using ruthenium (Ru) supported on various carriers as a catalytically active component as a catalyst for ammonia synthesis (for example, Patent Literature 1). It has been known that since catalysts using a transition metal such as Ru have a very high activity, ammonia can be synthesized with them under reaction conditions milder than those in the Haber-Bosch process. For example, although the Haber-Bosch process requires a reaction temperature of 400° C. or more and a reaction pressure of 10 MPa or more, in the case of a catalyst using Ru, reaction progresses at a reaction temperature of about 200° C. and a reaction pressure of 1.1 MPa or less, or even about atmospheric pressure.
Furthermore, intermetallic compounds have been considered as another catalyst for ammonia synthesis. An intermetallic compound of a transition metal such as Ru having high catalytic activity with other metal elements is a promising, inexpensive catalyst.
Examples of intermetallic compounds active in the synthesis of ammonia include intermetallic compounds of an alkali metal or alkaline earth metal and a transition metal, such as CaNi5, Mg2Ni and Mg2Cu (Patent Literature 2) and intermetallic compounds such as CeFe2, CeCo2 and CeRu2, which are known as a hydrogen storage alloy (Non Patent Literatures 1, 2). More specifically, Non Patent Literature 1 reports the results of synthesis of ammonia using a powder of an intermetallic compound such as CeFe2, CeRu2 or CeCo2, which has been prepared by a melting method while substituting the catalyst with a metal itself.
Furthermore, a method using the hydride AB5H˜6 prepared by reducing an intermetallic compound represented as an AB5-type intermetallic compound as a catalyst has been proposed. More specifically, the study reports that ammonia can be synthesized at room temperature by using, as a catalyst, a hydride prepared by reducing the above AB5-type intermetallic compound wherein A is a misch metal containing La as a main component and B is Ni and which has a BET specific surface area of 0.02 m2/g (Non Patent Literature 3).
It has also been known that intermetallic compounds are embrittled and crushed due to storage of hydrogen and a fine intermetallic compound is obtained due to release of hydrogen.
特許請求の範囲(英語) [claim1]
1. An activator for hydrogenation reaction, comprising an intermetallic compound represented by formula (1):
RTX  (1)
wherein
R represents a lanthanoid element,
T represents a transition metal in period 4 or period 5 in the periodic table, and
X represents Si, Al or Ge.

[claim2]
2. A method for using an intermetallic compound represented by formula (1), comprising contacting the intermetallic compound with hydrogen to activate a bond in a hydrogen molecule:
RTX  (1)
wherein
R represents a lanthanoid element,
T represents a transition metal in period 4 or period 5 in the periodic table, and
X represents Si, Al or Ge.

[claim3]
3. A catalyst comprising an intermetallic compound represented by formula (1):
RTX  (1)
wherein
R represents a lanthanoid element,
T represents a transition metal in period 4 or period 5 in the periodic table, and
X represents Si, Al or Ge.

[claim4]
4. The catalyst according to claim 3, wherein the catalyst is a catalyst for ammonia synthesis.

[claim5]
5. A transition metal-supported intermetallic compound comprising a transition metal M supported on an intermetallic compound represented by formula (1):
RTX  (1)
wherein
R represents a lanthanoid element,
T represents a transition metal in period 4 or period 5 in the periodic table, and
X represents Si, Al or Ge.

[claim6]
6. An activator for hydrogenation reaction, comprising the transition metal-supported intermetallic compound according to claim 5.

[claim7]
7. A method for using the transition metal-supported intermetallic compound according to claim 5, comprising contacting the intermetallic compound with hydrogen to activate a bond in a hydrogen molecule.

[claim8]
8. A catalyst comprising the transition metal-supported intermetallic compound according to claim 5.

[claim9]
9. The catalyst according to claim 8, wherein the catalyst is a catalyst for ammonia synthesis.

[claim10]
10. An intermetallic compound-hydrogen complex represented by formula (2), wherein the intermetallic compound is capable of storing and releasing hydrogen reversibly and the complex is capable of releasing hydrogen at 400° C. or less:
RTX·aH  (2)
wherein
R represents a lanthanoid element,
T represents a transition metal in period 4 or period 5 in the periodic table,
X represents Si, Al or Ge and
a represents a number of 0.5 or more and 1.5 or less.

[claim11]
11. A catalyst comprising the complex according to claim 10.

[claim12]
12. The catalyst according to claim 11, wherein the catalyst is a catalyst for ammonia synthesis.

[claim13]
13. A transition metal-supported complex comprising a transition metal M supported on the complex according to claim 10.

[claim14]
14. A catalyst comprising the transition metal-supported complex according to claim 13.

[claim15]
15. The catalyst according to claim 14, wherein the catalyst is a catalyst for ammonia synthesis.

[claim16]
16. A method for producing ammonia, comprising contacting nitrogen and hydrogen with a catalyst, wherein the catalyst is a catalyst according to claim 4.

[claim17]
17. The activator for hydrogenation reaction according to claim 1, wherein X is Si or Ge.

[claim18]
18. The activator for hydrogenation reaction according to claim 1, wherein T is Sc, Fe, Ru, Co, Rh or Ti.

[claim19]
19. The activator for hydrogenation reaction according to claim 1, wherein R is La, Gd or Ce.
  • 発明者/出願人(英語)
  • HOSONO HIDEO
  • GONG YUTONG
  • WU JLAZHEN
  • KITANO MASAAKI
  • YOKOYAMA TOSHIHARU
  • LU YANGFAN
  • YE TIANNAN
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • TOKYO INSTITUTE OF TECHNOLOGY
国際特許分類(IPC)
ライセンスをご希望の方、特許の内容に興味を持たれた方は、問合せボタンを押してください。

PAGE TOP

close
close
close
close
close
close