Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

L. Zhou, L.R. Enakonda, M. Harb, Y. Saih, A. Aguilar-Tapia, S. Ould-Chikh, J.-l. Hazemann, J. Li, N. Wei, D. Gary, P. Del-Gallo, J.-M. Basset
Applied Catalysis B: Environmental, Volume 208, Pages 44-59, ISSN 0926-3373, (2017)

 Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Keywords

Methane, Decomposition, Hydrogen, Fe, Carbon

Abstract

​Conducting catalytic methane decomposition over Fe catalysts is a green and economic route to produce H2 without CO/CO2 contamination. Fused 65 wt% and impregnated 20 wt% Fe catalysts were synthesized with different additives to investigate their activity, whereas showing Fe-Al2O3 combination as the best catalyst. Al2O3 is speculated to expose more Fe0 for the selective deposition of carbon nano tubes (CNTs). A fused Fe (65 wt%)-Al2O3 sample was further investigated by means of H2-TPR, in-situ XRD, HRTEM and XAS to conclude 750 °C is the optimized temperature for H2 pre-reduction and reaction to obtain a high activity. Based on density functional theory (DFT) study, a reaction mechanism over Fe catalysts was proposed to explain the formation of graphite from unstable supersaturated iron carbides decomposition. A carbon deposition model was further proposed which explains the formation of different carbon nano materials.

Code

DOI: 10.1016/j.apcatb.2017.02.052

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