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Straightforward Synthesis of Hierarchically Porous Nitrogen-Doped Carbon via Pyrolysis of Chitosan/Urea/KOH Mixtures and Its Application as a Support for Formic Acid Dehydrogenation Catalysts

By Dong-Wook Lee (1553212), Min-Ho Jin (1553224), Duckkyu Oh (1553209), Sung-Wook Lee (1553221) and Jong-Soo Park (1553218)


The development of cheap, simple, and green synthetic methods for hierarchically porous nitrogen-doped carbon, especially derived from renewable biomass, such as chitosan, remains a challenging topic. Here, we first synthesized hierarchically porous nitrogen-doped carbon (KIE-8) having graphene-like structure via simple pyrolysis of a chitosan/urea/KOH mixture without any conventional sophisticated treatments, such as freeze-drying, hydrothermal carbonization, and soft or hard templating. On the basis of various analyses of KIE-8, we demonstrated that effect of urea on mesopore formation was insignificant; however, when KOH is used as an activating agent in the presence of urea, a large amount of mesopores can be created along with conventional KOH-derived micropores. In addition, it was revealed that chitosan-derived carbon nanosheets directed by urea are torn into chitosan-derived carbon nanoflakes via KOH activation, and mesopores originate from interstitial voids in aggregates of the carbon nanoflakes, and micropores are derived from in-plane pores in each nanoflake. KIE-8 was used as a catalyst support for formic acid dehydrogenation at room-temperature. Pd­(6 wt %)/KIE-8 catalysts provided excellent catalytic activity (TOF = 280.7 mol H<sub>2</sub> mol metal<sup>–1</sup> h<sup>–1</sup>), and we demonstrated that the pore structure and nitrogen structure of KIE-8 are crucial factors to determine the catalytic activity

Topics: Biophysics, Biochemistry, Pharmacology, Biotechnology, Ecology, Developmental Biology, Computational Biology, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, mol, pore, KIE -8, nitrogen-doped carbon, hierarchically, chitosan-derived carbon nanosheets, mesopore, catalyst, KOH, urea, TOF, Hierarchically Porous Nitrogen-Doped Carbon, chitosan-derived carbon nanoflakes, formic acid dehydrogenation, micropore
Year: 2017
DOI identifier: 10.1021/acssuschemeng.7b01888.s001
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Provided by: FigShare
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