[1D01-08] CO2 recovery/conversion(1)

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)Japanese

[1D06] Development of Fe-Based Core–Shell Catalysts for Ammonia Synthesis: Structure–Function Relationships

○YUAN JING¹, Juna Shimizu¹, Masashi Hattori¹, Satoshi Ishikawa¹, Takashi Toyao², Michikazu Hara¹ (1. Institute of Science Tokyo, 2. Hokkaido University)

Keywords:

NH3 synthesis,Iron catalyst,core-shell structure

We discovered that a core–shell structure consisting of a metallic Fe core and an FeCr₂O₄ shell is spontaneously formed from an FeCrOx oxide precursor under reducing conditions. The resulting FeCr₂O₄ shell effectively suppresses the sintering of Fe particles while exerting little influence on the electronic state of the Fe surface, thereby contributing to enhanced ammonia synthesis activity. As a result, the FeCr catalyst exhibited superior performance compared with conventional industrial iron catalysts. Furthermore, the addition of a small amount of K further improved the catalytic activity, resulting in an ammonia synthesis rate more than twice that of conventional industrial iron catalysts. Notably, ammonia formation was also observed at 100 °C, highlighting the potential of this catalyst for low-temperature ammonia synthesis.