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Stability and kinetic studies of MOF‐derived carbon‐confined ultrafine Co catalyst for sodium borohydride hydrolysis
Author(s) -
Xu Dongyan,
Zhang Xinyan,
Zhao Xi,
Dai Ping,
Wang Chuansheng,
Gao Jun,
Liu Xien
Publication year - 2019
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4524
Subject(s) - sodium borohydride , catalysis , cobalt , hydrolysis , scanning electron microscope , chemical engineering , hydrogen production , mesoporous material , transmission electron microscopy , carbon fibers , chemistry , adsorption , materials science , inorganic chemistry , hydrogen , nanoparticle , nuclear chemistry , composite number , nanotechnology , organic chemistry , composite material , engineering
Summary A mesoporous carbon‐confined cobalt (Co@C) catalyst was fabricated by pyrolysis of macroscale Co‐metal–organic framework (MOF) crystals and used to catalyze NaBH 4 hydrolysis for hydrogen production. To reveal the structural changes of cobalt nanoparticles, we characterized the fresh and used Co@C catalysts using X‐ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and N 2 adsorption. This MOF‐derived Co@C exhibits high and stable activity toward NaBH 4 hydrolysis. No obvious agglomeration of Co nanoparticles occurred after five consecutive runs, implying good resistance of Co@C composite to metal aggregation. The kinetics of NaBH 4 hydrolysis was experimentally studied by changing initial NaBH 4 concentration, NaOH concentration, and catalyst dosage, respectively. It was found that the hydrogen generation rate follows a power law: r = A exp (−45.0/ RT )[ NaBH 4 ] 0.985 [ cat ] 1.169 [ NaOH ] −0.451 .