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Received March 19, 2020
Accepted May 15, 2020
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Confinement of Ru nanoparticles inside the carbon nanotube: Selectivity controls on methanol decomposition
Center for Environment and Sustainable Resources, Korea Research Institute of Chemical Technology, 141 Gajeong-ro, Daejeon 34114, Korea 1Center for Hydrogen Fuel Cell Research, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Korea
Korean Journal of Chemical Engineering, August 2020, 37(8), 1365-1370(6), 10.1007/s11814-020-0582-6
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Abstract
Carbon nanotubes (CNT) have been widely used as catalyst supports, and the confinement of metal nanoparticles inside the CNT cavity have received much attention. In this study, graphitic carbon nitride were used to introduce nitrogen to CNT and form ruthenium nanoparticles inside the CNT channel. The XPS evidenced that the ruthenium nanoparticles in the CNT cavity are present in more reduced state, and the nitrogen species are in a pyridinic and a pyrrolic form. The prepared catalysts exhibited excellent hydrogen and carbon monoxide selectivity. The hydrogen-to-carbon monoxide ratio was close to the stoichiometric ratio of methanol decomposition. In contrast, the ruthenium nanoparticles outside the CNT showed lower carbon monoxide selectivity at high methanol conversion. The alteration of electrical properties of ruthenium nanoparticles by the CNT channel and N-doping might hamper side reactions, such as water gas shift, methanation, dimethyl ether formation upon methanol decomposition.
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Kim YK, Park H, Energy Environ. Sci., 4(3), 685 (2011)
Park Y, Lee B, Kim C, Oh Y, Nam S, Park B, J. Mater. Res., 24(9), 2762 (2009)
Qiao Y, Guo S, Zhu K, Liu P, Li X, Jiang K, Sun CJ, Chen M, Zhou H, Energy Environ. Sci., 11(2), 299 (2018)
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Sheng ZH, Shao L, Chen JJ, Bao WJ, Wang FB, Xia XH, ACS Nano, 5(6), 4350 (2011)
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Peralta-Inga Z, Lane P, Murray JS, Boyd S, Grice ME, O'Connor CJ, Politzer P, Nano Lett., 3(1), 21 (2003)
