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Highly Active Ni- and Co-Based Bimetallic Catalysts for Hydrogen Production From Ammonia-Borane

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Title: Highly Active Ni- and Co-Based Bimetallic Catalysts for Hydrogen Production From Ammonia-Borane
Authors: Furukawa, Shinya Browse this author →KAKEN DB
Nishimura, Genki Browse this author
Takayama, Tomoaki Browse this author
Komatsu, Takayuki Browse this author
Keywords: hydrogen production
ammonia borane
Issue Date: 20-Mar-2019
Publisher: Frontiers Media
Journal Title: Frontiers in chemistry
Volume: 7
Start Page: 138
Publisher DOI: 10.3389/fchem.2019.00138
PMID: 30949471
Abstract: Ammonia-borane is one of the most promising candidates for hydrogen carriers. A series of Ni- and Co-based bimetallic catalysts supported on SiO2 (Ni-M/SiO2 and Co-M/SiO2; M = Ga, Ge, Sn, Zn) was prepared and tested as catalysts for hydrogen production from ammonia-borane (AB) in water or methanol. Ni-Zn/SiO2 and Co-Ge/SiO2 exhibited catalytic activities much higher than those of monometallic Ni/SiO2 and Co/SiO2, respectively. Ni-Zn/SiO2 showed a high catalytic activity when water was used as a solvent, where the reaction was completed within 6 min at room temperature with a specific reaction rate of 4.3 ml min(-1) mmol-cat(-1) mM-AB(-1). To the best of our knowledge, this is the highest value among those reported using 3d metal-based catalysts. Co-Ge/SiO2 afforded a five-fold higher reaction rate than that of the corresponding monometallic Co/SiO2. XRD, TEM, and HAADF-STEM-EDS analyses revealed that Ni0.75Zn0.25 and Co0.8Ge0.2 solid-solution alloys were formed with high phase purities. An XPS study showed that Co atoms in Co0.8Ge0.2 were electron-enriched due to electron transfer from Ge to Co, which may be the origin of the improved catalytic activity.
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 古川 森也

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