123rd General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2
Time 4월 19일 (금요일) 11:00~12:30
Code MAT.P-411
Subject Bimetallic-MOF-74s derived porous carbons with well-dispersed Ni-/MnO-nanoparticles for highly reactive redox catalysts
Authors Subin Shin, Sung Hwa Jhung1,*
Kyungpook National University, Korea
1Department of Chemistry, Kyungpook National University, Korea
Abstract A series of bimetallic metal-organic framework-74s (MOF-74s) (Zn/Ni or Zn/Mn in various compositions), were synthesized, and Ni or MnO-doped carbonaceous materials were firstly prepared by direct carbonization of the MOF-74s under an inert environment for applying in redox catalysis. The obtained MOF-derived nanomaterials (MDNMs) were characterized thoroughly to understand their physicochemical properties including phase, porosity, particle size, dispersion, and composition. The porosity of the MDNMs increased but the size and content of Ni or MnO in the MDNMs decreased monotonously with increasing Zn content in the bimetallic MOF-74s. One MDNM(75Zn25Mn), prepared from MOF-74(75%Zn/25%Mn), showed noticeably higher activity in the oxidation of benzyl alcohol as compared with not only the MDNM(xZnyMn)s but also MnOx-loaded carbon or loaded γ-alumina (or, MDNM(75Zn25Mn) showed ~ 54 times turnover frequency (TOF) to that of MnO/activated carbon). MDNM(75Zn25Mn) was also effective in the oxidative removal of dibenzothiophene from a model fuel. Moreover, MDNM(75Zn25Ni), prepared from MOF-74(75%Zn25%Ni), had the highest TOF in the reduction of 4-nitrophenol among various MDNM(xZnyNi)s. The highest activity of MDNM(75Zn25Mn) and MDNM(75Zn25Ni), even with the lowest Mn and Ni contents in the respective MDNMs, for oxidation and reduction in several cycles might be due to the well-dispersed MnO (and Ni) and high porosity with mesopores. Therefore, it can be suggested that pyrolysis of MOFs composed of mixed-metal can be a facile way to get highly effective and reusable heterogeneous catalysts, with small sized and uniformly-dispersed active species, for various organic redox reactions.
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