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Self‐organized Ruthenium–Barium Core–Shell Nanoparticles on a Mesoporous Calcium Amide Matrix for Efficient Low‐Temperature Ammonia Synthesis
Author(s) -
Kitano Masaaki,
Inoue Yasunori,
Sasase Masato,
Kishida Kazuhisa,
Kobayashi Yasukazu,
Nishiyama Kohei,
Tada Tomofumi,
Kawamura Shigeki,
Yokoyama Toshiharu,
Hara Michikazu,
Hosono Hideo
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201712398
Subject(s) - catalysis , mesoporous material , barium , ammonia production , materials science , ruthenium , ammonia , nanoparticle , chemical engineering , inorganic chemistry , chemistry , nanotechnology , organic chemistry , metallurgy , engineering
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.