Self‐organized Ruthenium–Barium Core–Shell Nanoparticles on a Mesoporous Calcium Amide Matrix for Efficient Low‐Temperature Ammonia Synthesis

作者：Masaaki Kitano, Yasunori Inoue, Masato Sasase, Kazuhisa Kishida, Yasukazu Kobayashi, Kohei Nishiyama, Tomofumi Tada, Shigeki Kawamura, Toshiharu Yokoyama, Masahiko Hara, Hideo Hosono · 发表于：Angewandte Chemie International Edition · 年份：2018 · DOI：10.1002/anie.201712398 · 被引用次数：212 · 研究领域：Ammonia Synthesis and Nitrogen Reduction、Hydrogen Storage and Materials、Nanomaterials for catalytic reactions

Abstract A low‐temperature ammonia synthesis process is required for on‐site synthesis. Barium‐doped calcium amide (Ba‐Ca(NH 2 ) 2 ) enhances the efficacy of ammonia synthesis mediated by Ru and Co by 2 orders of magnitude more than that of a conventional Ru catalyst at temperatures below 300 °C. Furthermore, the presented catalysts are superior to the wüstite‐based Fe catalyst, which is known as a highly active industrial catalyst at low temperatures and pressures. Nanosized Ru–Ba core–shell structures are self‐organized on the Ba‐Ca(NH 2 ) 2 support during H 2 pretreatment, and the support material is simultaneously converted into a mesoporous structure with a high surface area (>100 m 2 g −1 ). These self‐organized nanostructures account for the high catalytic performance in low‐temperature ammonia synthesis.