Tuning of active nickel species in MOF-derived nickel catalysts for the control on acetic acid steam reforming and hydrogen production
International Journal of Hydrogen Energy(2023)
摘要
Acetic acid (AcOH) steam reforming for hydrogen (H2) generation was investigated using a zero valent nickel complex (Ni-comp) derived from a metal-organic framework precursor supported over aluminum oxide/lanthanum oxide-cerium dioxide (ALC). The effects of Ni loading ratio (10, 15, and 20 wt%) on the catacatalytic activity were investigated in the range of 400 to 650 °C to H2 generation. The Ni-comp/ALC catalysts exhibited almost complete conversion of AcOH (XAcOH >98%) to H2 (XH2>90%) alongside some impurities (e.g., carbon monoxide, methane, and carbon dioxide). A maximum H2 yield (91.36% (0.064 mol-1 gcat−1 h−1)) was attained at the following conditions: 15 wt% Ni loading, steam to carbon molar ratio of 6.5, weight hourly space velocity of 1.05 h−1, and 600 °C. The 15 wt% Ni catalyst maintained sufficient stability over 40 h reaction time. Accordingly, Ni-comp-ALC interactions were seen to efficiently improve the activity and stability of the catalyst so as to synergistically resist coke deposition and metal sintering through the formation of a large number of free Ni particles and oxygen vacancies.
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关键词
Nickel complex catalyst,Metal-organic framework,Hydrogen production,Acetic acid steam reforming,Reaction mechanism
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