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Materials 2015, 8(6), 3442-3455; doi:10.3390/ma8063442

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
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Umit Demirci
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)
View Full-Text   |   Download PDF [2014 KB, uploaded 10 June 2015]   |  

Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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