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Composite body, method for producing composite body, ammonia synthesis catalyst, and ammonia synthesis method

Foreign code F180009409
File No. J1014-19WO
Posted date Apr 20, 2018
Country EPO
Application number 15864436
Gazette No. 3228386
Date of filing Dec 4, 2015
Gazette Date Oct 11, 2017
International application number JP2015084207
International publication number WO2016088896
Date of international filing Dec 4, 2015
Date of international publication Jun 9, 2016
Priority data
  • P2014-246717 (Dec 5, 2014) JP
  • 2015WO-JP84207 (Dec 4, 2015) WO
Title Composite body, method for producing composite body, ammonia synthesis catalyst, and ammonia synthesis method
Abstract (EP3228386)
An ammonia synthesis catalyst having high activity is obtained by having a two-dimensional electride compound having a lamellar crystal structure such as Ca 2 N support a transition metal.
However, since the two-dimensional electride compound is unstable, the stability of the catalyst is low.
In addition, in cases where a two-dimensional electride compound is used as a catalyst support, it is difficult to shape the catalyst depending on reactions since the two-dimensional electride compound has poor processability.
A composite which includes a transition metal, a support and a metal amide compound, wherein the support is a metal oxide or a carbonaceous support; and the metal amide compound is a metal amide compound represented by general formula (1).
M(NH 2 ) x ···(1) (In general formula (1), M represents at least one metal atom selected from the group consisting of Li, Na, K, Be, Mg, Ca, Sr, Ba and Eu; and x represents the valence of M.)
Scope of claims [claim1]
1. A composite comprising a transition metal, a support, and a metal amide compound,
wherein the support is a metal oxide or a carbonaceous support, and
the metal amide compound is a compound represented by the following general formula (1),

M(NH 2) x ... (1)

wherein M represents at least one metal atom selected from the group consisting of Li, Na, K, Be, Mg, Ca, Sr, Ba and Eu, and x represents the valence of M.
[claim2]
2. The composite according to claim 1, wherein the support is a basic, neutral, or weakly acidic metal oxide.
[claim3]
3. The composite according to claim 1, wherein the support is at least one metal oxide selected from the group consisting of ZrO 2, TiO 2, CeO 2, Al 2O 3, Nb 2O 5, Ta 2O 5, and MgO.
[claim4]
4. The composite according to any one of claims 1 to 3, wherein the composite has a BET specific surface area of 10 m **2/g or more.
[claim5]
5. The composite according to any one of claims 1 to 4, wherein the metal atom M is Ca.
[claim6]
6. The composite according to any one of claims 1 to 5, wherein the transition metal is Ru.
[claim7]
7. A supported metal catalyst comprising the composite according to any one of claims 1 to 6.
[claim8]
8. An ammonia synthesis catalyst comprising the composite according to any one of claims 1 to 6.
[claim9]
9. A method of producing the composite according to any one of claims 1 to 6, comprising steps of: mixing a metal atom source comprising the metal atom M, the support, and liquid ammonia, and obtaining a metal amide-supporting support mixing by reacting the metal atom source with the liquid ammonia to form the metal amide compound on the support.
[claim10]
10. The method of producing a composite according to claim 9, comprising steps of supporting the raw material compound of the transition metal (hereinafter referred to as a transition metal raw material) on the metal amide-supporting support, and
depositing the transition metal by thermally decomposing the transition metal raw material.
[claim11]
11. A method of synthesizing ammonia, comprising a step of bringing a gas comprising nitrogen and a gas comprising hydrogen into contact with the ammonia synthesis catalyst according to claim 8 to synthesize ammonia.
[claim12]
12. The method for synthesizing ammonia according to claim 11, wherein a temperature at which the ammonia synthesis catalyst is brought into contact with the ammonia synthesis catalyst is 100 deg.C or more and 600 deg.C or less.
[claim13]
13. The method for synthesizing ammonia according to claim 11 or 12, wherein the pressure when contacting the ammonia synthesis catalyst is 10 kPa or more and 20 MPa or less.
  • Applicant
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • TOKYO INSTITUTE OF TECHNOLOGY
  • Inventor
  • HOSONO HIDEO
  • HARA MICHIKAZU
  • KITANO MASAAKI
  • YOKOYAMA TOSHIHARU
  • INOUE YASUNORI
IPC(International Patent Classification)
Specified countries (EP3228386)
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
Extension States: BA ME
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