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Issue 40, 2018, Issue in Progress
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Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N2O reduction by CO: a theoretical study

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Abstract

Metal-free catalysts for the transformation of N2O and CO into green products under mild conditions have long been expected. The present work proposes using silicon-coordinated nitrogen-doped graphene (SiN4G) as a catalyst for N2O reduction and CO oxidation based on periodic DFT calculations. The reaction proceeds via two steps, which are N2O reduction at the Si reaction center, producing Si–O*, which subsequently oxidizes CO to CO2. The N2O reduction occurs with an activation energy barrier of 0.34 eV, while the CO oxidation step requires an energy of 0.66 eV. The overall reaction is highly exothermic, with a reaction energy of −3.41 eV, mostly due to the N2 generation step. Compared to other metal-free catalysts, SiN4G shows the higher selectivity because it not only strongly prefers to adsorb N2O over CO, but the produced N2 and CO2 are easily desorbed, which prevents the poisoning of the active catalytic sites. These results demonstrate that SiN4G is a promising metal-free catalyst for N2O reduction and CO oxidation under mild conditions, as the reaction is both thermodynamically and kinetically favorable.

Graphical abstract: Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N2O reduction by CO: a theoretical study

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Publication details

The article was received on 17 Apr 2018, accepted on 12 Jun 2018 and first published on 19 Jun 2018


Article type: Paper
DOI: 10.1039/C8RA03265C
Citation: RSC Adv., 2018,8, 22322-22330
  • Open access: Creative Commons BY license
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    Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N2O reduction by CO: a theoretical study

    A. Junkaew, S. Namuangruk, P. Maitarad and M. Ehara, RSC Adv., 2018, 8, 22322
    DOI: 10.1039/C8RA03265C

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