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Implication of iron nitride species to enhanced catalytic activity and stability of carbon nanotubes supported Fe catalysts for carbon-free hydrogen via low temperature ammonia decomposition

Abstract

This work is aimed to boost the catalytic ability of carbon nanotubes (CNTs) supported Fe based catalysts, prepared by using wet-impregnation followed by nitrogenization, for carbon-free hydrogen production from NH3 decomposition at low temperature. Nitrogenization temperature and iron loading have significant effects on the size of well dispersed Fe2N crystallites. Fe3O4/CNTs catalysts at higher nitrogenation temperature, under NH3 flow with suitable Fe content, led to the formation stable and uniformly distributed Fe2N species, which plays active role in the enhanced catalytic ability of Fe3O4/CNTs catalysts. However, in comparison with nitrogenization of Fe3O4/CNTs catalyst either under H2 or Ar, leading to the formation of Fe4N and Fe2N species. In the presence of Fe4N phases, the Fe3O4/CNTs catalyst exhibits enhanced catalytic activity. In brief, collaborative interaction of active site Fe2N and carbon nanotubes in Fe2N/CNTs catalysts resulted in significant increase in catalytic activity and durability for 40 h. The efficient control of active sites Fe2N density and synergism between carrier and iron nitrides crystallite composition are key aspects for the efficient design of transition nitrides catalysts for carbon-free hydrogen via ammonia decomposition.

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Publication details

The article was received on 06 Nov 2017, accepted on 03 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7CY02270K
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Implication of iron nitride species to enhanced catalytic activity and stability of carbon nanotubes supported Fe catalysts for carbon-free hydrogen via low temperature ammonia decomposition

    H. Zhang, Q. Gong, S. Ren, M. A. Arshid , W. Chu and C. Chen, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C7CY02270K

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