催化作用
高分辨率透射电子显微镜
碳纤维
甲烷
分解
材料科学
氢
石墨
化学工程
碳化物
碳纳米管
无机化学
化学
纳米技术
复合数
冶金
透射电子显微镜
复合材料
有机化学
工程类
作者
Zhou Lu,E. Linga Reddy,Moussab Harb,Youssef Saih,Antonio Aguilar‐Tapia,Samy Ould‐Chikh,Jean‐Louis Hazemann,Jun Li,Nini Wei,Daniel Gary,Pascal Del‐Gallo,Jean‐Marie Basset
标识
DOI:10.1016/j.apcatb.2017.02.052
摘要
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.
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