Ordered mesoporous “one-pot” synthesized Ni-Mg(Ca)-Al2O3 as effective and remarkably stable catalysts for combined steam and dry reforming of methane (CSDRM)
作者： Karam Jabbour , Pascale Massiani , Anne Davidson , Sandra Casale , Nissrine El Hassan
DOI: 10.1016/J.APCATB.2016.08.009
关键词: Inorganic chemistry 、 Carbon 、 Chemistry 、 Methane 、 Thermal stability 、 Catalysis 、 Chemical engineering 、 Mesoporous material 、 Reactivity (chemistry) 、 Carbon dioxide reforming 、 Nickel
摘要: Abstract Two series of Nix% (x: 5–10 wt%) and Ni5%M5% (M: Ca or Mg) containing mesoporous Al2O3 catalysts were prepared by “one-pot” synthesis following an evaporation-induced self-assembly (EISA) method. After reduction, the showed very high Ni dispersion within structured oxide matrix giving activities long-term stabilities in combined steam dry reforming methane (CSDRM) carried out at 800 °C. Both increase content addition Mg (or Ca) are beneficial to performances, with activity levels reaching maximum-expected thermodynamic ones for Ni10%Al2O3. In free catalysts, a relationship between nickel content, reactivity level carbon deposition is found. Nevertheless, formation not detrimental catalytic stability due nanotubes only outside alumina grains. Addition suppresses great extent leads selectivity towards targeted CSDRM reaction, almost no occurrence side reactions. The remarkable thermal ordered-mesoporous structure (along 40 h run) along stabilization well-dispersed Ni0 shown be key factors accounting excellent long term performances spite harsh conditions (temperature steam) imposed reaction
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