CONJUGATE, CATALYST AND METHOD FOR PRODUCING AMMONIA

• Main Authors: YOKOYAMA, Toshiharu, KAWAMURA, Shigeki, KISHIDA, Kazuhisa, ITO, Munenobu, HOSONO, Hideo, INOUE, Yasunori, KITANO, Masaaki
• Format: Patent
• Language: English; French; German
• Published: 16.12.2020
• Subjects: AMMONIA; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; COMPOUNDS THEREOF; CYANOGEN; INORGANIC CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING

The present invention relates to a complex including a mayenite type compound and an active metal supported on the mayenite type compound, wherein after heating the complex from a temperature of 20°C to a temperature of 450°C at a temperature rise rate of 10°C/min and then holding in an environment at a temperature of 450°C and a pressure of 3 MPa for 10 hours while bringing a mixed gas containing a nitrogen gas and a hydrogen gas at a volume ratio of the nitrogen gas to the hydrogen gas of 1/3 into contact with the complex, an average particle diameter of the active metal is less than 5.5 nm, and in the active metal, a proportion of an active metal having a particle diameter of 1 nm or more and less than 3 nm is 60% or more. A catalyst of the present invention contains the complex of the present invention. A method for producing ammonia of the present invention includes a step of producing ammonia by bringing a gas containing nitrogen and hydrogen into contact with the catalyst of the present invention. In accordance with the present invention, a complex from which a catalyst having high catalytic activity can be obtained, a catalyst containing the complex, and a method for producing ammonia using the catalyst can be provided.