Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 208, Issue -, Pages 44-59Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.02.052
Keywords
Methane; Decomposition; Hydrogen; Fe; Carbon
Funding
- Air Liquide company
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Conducting catalytic methane decomposition over Fe catalysts is a green and economic route to produce H-2 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 Fe for the selective deposition of carbon nano tubes (CNTS). A fused Fe (65 wt%)-Al2O3 sample was further investigated by means of H-2-TPR, in-situ XRD, HRTEM and XAS to conclude 750 degrees C is the optimized temperature for H-2 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. (C) 2017 Elsevier B.V. All rights reserved.
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