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Supported metal catalyst and method of synthesizing ammonia using the same

外国特許コード F170009049
整理番号 J1014-10WO
掲載日 2017年4月26日
出願国 アメリカ合衆国
出願番号 201515121702
公報番号 20160361712
出願日 平成27年2月12日(2015.2.12)
公報発行日 平成28年12月15日(2016.12.15)
国際出願番号 JP2015053853
国際公開番号 WO2015129471
国際出願日 平成27年2月12日(2015.2.12)
国際公開日 平成27年9月3日(2015.9.3)
優先権データ
  • 特願2014-037370 (2014.2.27) JP
  • 2015WO-JP53853 (2015.2.12) WO
発明の名称 (英語) Supported metal catalyst and method of synthesizing ammonia using the same
発明の概要(英語) (US20160361712)
A catalyst is provided which is used for continuously synthesizing ammonia using a gas containing hydrogen and nitrogen as a raw material, wherein a transition metal which exhibits catalytic activity is supported by a support, and the support is a two-dimensional electride or a precursor thereof.
The two-dimensional electride or the precursor thereof is a metal nitride represented by MxNyHz (M represents one or two or more of Group II metals selected from the group consisting of Mg, Ca, Sr and Ba, and x, y and z are in ranges of 1≦x≦11, 1≦y≦8, and 0≦z≦4 respectively, in which x is an integer, and y and z are not limited to an integer) or M3N2 (M is the same as above), or a metal carbide selected from the group consisting of Y2C, Sc2C, Gd2C, Tb2C, Dy2C, Ho2C and Er2C.
These catalysts are used for continuously reacting nitrogen with hydrogen, which are raw materials, on the catalyst, wherein the reaction is performed in an ammonia synthesis reaction system under the preferable conditions of a reaction temperature which is equal to or higher than 100° C. and equal to or lower than 600° C., and a reaction pressure which is equal to or higher than 10 kPa and lower than 20 MPa.
特許請求の範囲(英語) [claim1]

1-9. (canceled)
[claim2]
10. A supported metal catalyst, comprising: a transition metal which exhibits catalytic activity,
wherein the transition metal is supported by a support, and
the support is a two-dimensional electride or a precursor thereof.
[claim3]
11. The supported metal catalyst according to claim 10, wherein the supported metal catalyst is a catalyst suitable for synthesizing ammonia.
[claim4]
12. The supported metal catalyst according to claim 10, wherein the supported metal catalyst is a catalyst suitable for synthesizing ammonia, wherein a gas comprising hydrogen and nitrogen is used as a raw material.
[claim5]
13. The supported metal catalyst according to claim 11, wherein the ammonia is synthesized continuously.
[claim6]
14. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof is a metal nitride represented by MxNyHz or a hydride thereof, wherein M represents one or two or more of Group II metals selected from the group consisting of Mg, Ca, Sr and Ba, and
x, y and z are in ranges of 1 <= x <= 11, 1 <= y <= 8, and 0 <= z <= 4 respectively, in which x is an integer, and y and z are not limited to an integer.
[claim7]
15. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof is a metal nitride represented by M3N2, wherein M represents one or two or more of Group II metals selected from the group consisting of Mg, Ca, Sr and Ba.
[claim8]
16. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof is at least one selected from the group consisting of Ca2N, Sr2N, Ba2N, Ca2NH, CaNH, Ca(NH2)2, Y2C, Sc2C, Gd2C, Tb2C, Dy2C, Ho2C and Er2C.
[claim9]
17. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof comprise at least one compound selected from the group consisting of Ca2N, Sr2N and Ba2N, wherein a part of Ca of Ca2N, Sr of Sr2N, and Ba of Ba2N is substituted with at least one or more of alkaline metal elements selected from the group consisting of Li, Na, K, Rb and Cs.
[claim10]
18. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof is at least one of Ca3N2 and Mg3N2.
[claim11]
19. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof is a metal carbide selected from the group consisting of Y2C, Sc2C, Gd2C, Tb2C, Dy2C, Ho2C and Er2C, or is a hydride thereof.
[claim12]
20. The supported metal catalyst according to claim 10, wherein the two-dimensional electride or a precursor thereof is a Ca -- N -- H-based compound.
[claim13]
21. The supported metal catalyst according to claim 10, wherein the transition metal is at least one selected from the group consisting of Cr, Mo, W, Mn, Tc, Re, Fe, Ru, Os, Co, Rh and Ir.
[claim14]
22. The supported metal catalyst according to claim 10, wherein the transition metal is at least one selected from the group consisting of Ru, Co and Fe.
[claim15]
23. The supported metal catalyst according to claim 10, wherein an amount of the transition metal is in a range of 0.01 to 30 wt % with respect to that of the support.
[claim16]
24. A method of synthesizing ammonia, comprising: preparing (a) a supported metal catalyst, wherein a transition metal which exhibits catalytic activity is supported by a support and the support is a two-dimensional electride or a precursor thereof, and
(b) gas comprising hydrogen and the nitrogen, which is used as a raw material; and
reacting the nitrogen with the hydrogen on the catalyst in an ammonia synthesis reaction device, in which the supported metal catalyst is provided, to synthesize ammonia.
[claim17]
25. The method of synthesizing ammonia according to claim 24, wherein the reaction of the nitrogen and the hydrogen is performed at a reaction temperature which is equal to or higher than 100 deg. C. and equal to or lower than 600 deg. C.
[claim18]
26. The method of synthesizing ammonia according to claim 24, wherein the reaction of the nitrogen and the hydrogen is performed at a reaction pressure which is equal to or higher than 10 kPa and lower than 20 MPa.
  • 発明者/出願人(英語)
  • HOSONO HIDEO
  • HARA MICHIKAZU
  • KITANO MASAAKI
  • YOKOYAMA TOSHIHARU
  • INOUE YASUNORI
  • KAMBARA SHINJI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • TOKYO INSTITUTE OF TECHNOLOGY
国際特許分類(IPC)
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