Cobalt-boron catalyst for NaBH4 hydrolysis: The state of the active component forming from cobalt chloride in a reaction medium
作者： O.V. Netskina , D.I. Kochubey , I.P. Prosvirin , S.E. Malykhin , O.V. Komova
DOI: 10.1016/J.MCAT.2017.08.008
关键词: Coordination number 、 Chemistry 、 Cobalt hydroxide 、 Catalysis 、 Aqueous solution 、 Inorganic chemistry 、 Cobalt 、 Sodium borohydride 、 Boron 、 X-ray photoelectron spectroscopy
摘要: Abstract The structure of a cobalt-boron catalyst obtained by reduction cobalt chloride in an aqueous solution sodium borohydride at ambient temperature has been investigated TEM HR, XPS, EXAFS and X-ray diffraction method. It was found that nanoparticles the forming consisted core shell. oxygen-containing compounds (cobalt hydroxide borates) mainly reside In spite amorphous state analysis indicated presence ferromagnetic clusters with shortest Co distance about 2.5 A coordination number 2.7 which are regularly distributed within average separations 5.8 A. B bonds, short absence long distances (4.3 4.8 A) as well boron bound to hydrogen allows suggestion be made stabilization tetramers occurs due boron-hydrogen formed BH 4 − ions upon chloride. To substantiate above model active phase DFT method PBE functional plane-wave basis employed showed may exist matrix isolated from surrounding medium
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