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Ammonia synthesis catalyst and ammonia synthesis method

外国特許コード F170009051
整理番号 J1014-13WO
掲載日 2017年4月26日
出願国 アメリカ合衆国
出願番号 201515125462
公報番号 20170088433
出願日 平成27年1月9日(2015.1.9)
公報発行日 平成29年3月30日(2017.3.30)
国際出願番号 JP2015050545
国際公開番号 WO2015136954
国際出願日 平成27年1月9日(2015.1.9)
国際公開日 平成27年9月17日(2015.9.17)
優先権データ
  • 特願2014-050700 (2014.3.13) JP
  • 2015WO-JP50545 (2015.1.9) WO
発明の名称 (英語) Ammonia synthesis catalyst and ammonia synthesis method
発明の概要(英語) (US20170088433)
The ammonia synthesis catalyst of the present invention, comprises: a powder of a perovskite oxyhydride having hydride (H-) incorporated therein as a support; and a metal or a metal compound exhibiting a catalytic activity for ammonia synthesis, supported on the support, and the perovskite oxyhydride is represented by ATiO3-xHx (wherein A represents Ca, Sr, or Ba, and 0.1≦x≦0.6).
特許請求の範囲(英語) [claim1]
1. An ammonia synthesis catalyst, comprising: a powder of a perovskite oxyhydride having hydride (H-) incorporated therein as a support; and a metal or a metal compound exhibiting a catalytic activity for ammonia synthesis, supported on the support.
[claim2]
2. The ammonia synthesis catalyst according to claim 1, wherein the perovskite oxyhydride is represented by ATiO3-xHx (wherein A represents Ca, Sr, or Ba, and 0.1 <= x <= 0.6).
[claim3]
3. The ammonia synthesis catalyst according to claim 1, wherein the perovskite oxyhydride further contains nitrogen.
[claim4]
4. The ammonia synthesis catalyst according to claim 3, wherein the perovskite oxyhydride is represented by ATi(O3-zHxNy) (wherein A represents Ca, Sr, or Ba, and 0.1 <= x <= 0.6, 0<y <= 0.3, z >= x+y, and z-x-y represents the amount of oxygen defects).
[claim5]
5. The ammonia synthesis catalyst according to claim 1, wherein the metal exhibiting a catalytic activity is supported on the surface of the powder in the form of metal nanoparticles.
[claim6]
6. The ammonia synthesis catalyst according to claim 1, wherein the metal compound exhibiting a catalytic activity is mixed with the powder and supported thereon.
[claim7]
7. The ammonia synthesis catalyst according to claim 5, wherein the metal exhibiting a catalytic activity or the metal of the metal compound exhibiting a catalytic activity is Ru and the supported amount in terms of Ru metal with respect to the support is from 0.1 to 5 wt %.
[claim8]
8. A method for producing an ammonia synthesis catalyst, comprising: a first step of preparing a powder of a perovskite oxyhydride having hydride (H-) incorporated therein by keeping a powder of a perovskite titanium-containing oxide as a starting material together with a powder of an alkali metal hydride or an alkaline earth metal hydride selected from LiH, CaH2, SrH2, and BaH2 in a temperature range of 300 deg. C. or higher and lower than the melting point of the hydride in a vacuum or in an inert gas atmosphere, thereby substituting some of the oxide ions in the oxide with hydride ions;
a second step of preparing a catalyst precursor by dispersing the perovskite oxyhydride powder obtained in the first step in a solvent solution of a compound of a metal having an ammonia synthesis activity, followed by evaporating the solvent; and
a third step of preparing a catalyst having a metal compound exhibiting a catalytic activity supported on the powder by drying the catalyst precursor obtained in the second step.
[claim9]
9. The method for producing an ammonia synthesis catalyst according to claim 8, wherein the method further comprises, after the third step, a fourth step of preparing a catalyst having metal nanoparticles supported on the surface of the powder by heating and reducing the metal compound in a reducing atmosphere or thermally decomposing the metal compound in a vacuum.
[claim10]
10. The method for producing an ammonia synthesis catalyst according to claim 8, wherein the method comprises, after the first step and before the second step, a step of incorporating nitrogen in the perovskite oxyhydride by treating the powder of the perovskite oxyhydride in the presence of a nitrogen supply source substance.
[claim11]
11. The method for producing an ammonia synthesis catalyst according to claim 8, wherein the method comprises, after the third step or the fourth step, a step of incorporating nitrogen in the perovskite oxyhydride by treating the catalyst in the presence of a nitrogen supply source substance.
[claim12]
12. An ammonia synthesis method, which is a method for synthesizing ammonia by reacting hydrogen and nitrogen using a gas containing hydrogen and nitrogen as raw materials, wherein the catalyst according to claim 1 is packed in a catalytic packed bed in a synthesis reactor, and nitrogen and hydrogen as the raw materials are reacted on the catalyst under conditions of a reaction temperature of 300 deg. C. to 450 deg. C. and a reaction pressure of 10 kPa or more and less than 20 MPa.
  • 発明者/出願人(英語)
  • KAGEYAMA HIROSHI
  • KOBAYASHI YOJI
  • MASUDA NAOYA
  • HOSONO HIDEO
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
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