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Open AccessArticle

Ru-N-C Hybrid Nanocomposite for Ammonia Dehydrogenation: Influence of N-doping on Catalytic Activity

1
Fuel Cell Research Center, Korea Institute of Science and Technology, Seoul 136791, Korea
2
Clean Energy and Chemical Engineering, Korea University of Science and Technology, Daejeon 34113, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Umit Demirci
Materials 2015, 8(6), 3442-3455; https://doi.org/10.3390/ma8063442
Received: 19 April 2015 / Revised: 29 May 2015 / Accepted: 3 June 2015 / Published: 10 June 2015
(This article belongs to the Special Issue Hydrogen Storage Materials)
For application to ammonia dehydrogenation, novel Ru-based heterogeneous catalysts, Ru-N-C and Ru-C, were synthesized via simple pyrolysis of a mixture of RuCl3·6H2O and carbon black with or without dicyandiamide as a nitrogen-containing precursor at 550 °C. Characterization of the prepared Ru-N-C and Ru-C catalysts via scanning transmission electron microscopy, in conjunction with energy dispersive X-ray spectroscopy, indicated the formation of hollow nanocomposites in which the average sizes of the Ru nanoparticles were 1.3 nm and 5.1 nm, respectively. Compared to Ru-C, the Ru-N-C nanocomposites not only proved to be highly active for ammonia dehydrogenation, giving rise to a NH3 conversion of >99% at 550 °C, but also exhibited high durability. X-ray photoelectron spectroscopy revealed that the Ru active sites in Ru-N-C were electronically perturbed by the incorporated nitrogen atoms, which increased the Ru electron density and ultimately enhanced the catalyst activity. View Full-Text
Keywords: Ru-N-C; ammonia; dehydrogenation; N-doping; hollow graphitic structure; fuel cell Ru-N-C; ammonia; dehydrogenation; N-doping; hollow graphitic structure; fuel cell
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Hien, N.T.B.; Kim, H.Y.; Jeon, M.; Lee, J.H.; Ridwan, M.; Tamarany, R.; Yoon, C.W. Ru-N-C Hybrid Nanocomposite for Ammonia Dehydrogenation: Influence of N-doping on Catalytic Activity. Materials 2015, 8, 3442-3455.

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