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Support metal catalyst and method for synthesizing ammonia using same catalyst

Foreign code F170009039
File No. J1014-10WO
Posted date Apr 26, 2017
Country EPO
Application number 15755657
Gazette No. 3156126
Date of filing Feb 12, 2015
Gazette Date Apr 19, 2017
International application number JP2015053853
International publication number WO2015129471
Date of international filing Feb 12, 2015
Date of international publication Sep 3, 2015
Priority data
  • P2014-037370 (Feb 27, 2014) JP
  • 2015WO-JP53853 (Feb 12, 2015) WO
Title Support metal catalyst and method for synthesizing ammonia using same catalyst
Abstract (EP3156126)
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 M 3 N 2 (M is the same as above), or a metal carbide selected from the group consisting of Y 2 C, Sc 2 C, Gd 2 C, Tb 2 C, Dy 2 C, Ho 2 C and Er 2 C.
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.
Scope of claims [claim1]
1. A supported metal catalyst for synthesizing ammonia, 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
the catalyst is used for continuously synthesizing ammonia using a gas containing hydrogen and nitrogen as a raw material.
[claim2]
2. The supported metal catalyst for synthesizing ammonia according to Claim 1, wherein
the two-dimensional electride or the precursor thereof is a metal nitride represented by MxNyHz (here, 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 a hydride thereof.
[claim3]
3. The supported metal catalyst for synthesizing ammonia according to Claim 1, wherein
the two-dimensional electride or the precursor thereof is a metal nitride represented by M 3N 2 (here, M represents one or two or more of Group II metals selected from the group consisting of Mg, Ca, Sr, and Ba).
[claim4]
4. The supported metal catalyst for synthesizing ammonia according to Claim 1,
wherein the two-dimensional electride or the precursor thereof is a calcium nitride represented by Ca 2N.
[claim5]
5. The supported metal catalyst for synthesizing ammonia according to Claim 1,
wherein the two-dimensional electride or the precursor thereof is metal carbide selected from the group consisting of Y 2C, Sc 2C, Gd 2C, Tb 2C, Dy 2C, Ho 2C and Er 2C, or the hydride thereof.
[claim6]
6. The supported metal catalyst for synthesizing ammonia according to Claim 1,
wherein an amount of the transition metal which is supported is in a range of 0.01 to 30 wt% with respect to an amount of the support.
[claim7]
7. The supported metal catalyst for synthesizing ammonia according to Claim 1,
wherein the transition metal is at least one selected from the group consisting of Ru, Co or Fe.
[claim8]
8. A method of producing the catalyst according to any one of Claims 1 to 7,
wherein a transition metal is carried by a compound powder, which composes the support, by an impregnation method, a physical mixing method, a thermal decomposition method, a liquid phase method or a vapor deposition method.
[claim9]
9. A method of synthesizing ammonia, comprising: continuously reacting nitrogen with hydrogen, which are raw materials, on the catalyst according to any one of Claims 1 to 7, wherein the reaction is performed using the catalyst in an ammonia synthesis reaction device under the conditions of a reaction temperature which is equal to or higher than 100 deg.C and equal to or lower than 600 deg.C, and a reaction pressure which is equal to or higher than 10 kPa and lower than 20 MPa.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • TOKYO INSTITUTE OF TECHNOLOGY
  • Inventor
  • HOSONO HIDEO
  • HARA MICHIKAZU
  • KITANO MASAAKI
  • YOKOYAMA TOSHIHARU
  • INOUE YASUNORI
  • KAMBARA SHINJI
IPC(International Patent Classification)
Specified countries (EP3156126)
Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
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