For Glycerol Steam Reforming Hydrogen Production Of Ni / Ce-mo (m = Zr, Gd) Catalysts

Hydrogen production from glycerol steam reforming reaction is regarded as environmental benign and practically effective way to provide hydrogen for fuel cell applications. The catalyst for hydrogen production from glycerol steam reforming is a current highlight for fuel cell technique. The critical challenge for glycerol steam reforming catalysts is to improve stability, selectivity and low temperature activity. Ni-based catalysts were widely studied in the glycerol steam reforming, due to its well catalytic active and low cost. But the resistance to sintering and carbon deposition of catalyst need further improving. CeO₂-based oxides are characterized with good oxygen-storage capacity and tend to interact with active component, which is beneficial for eliminating carbon deposition and adjusting chemical nature of active component. This would improve the catalyst stability. In this work, a series of Ni/Ce-M-O (M=Zr or Gd) catalysts for steam reforming of glycerol were studied, which exhibited high low temperature activity and good stability for glycerol steam reforming.A series of Ni/Ce_xZr_1-xO₂ (x=0.2,0.4,0.6,0.8) catalysts were prepared by impregnation method for hydrogen production from steam reforming of glycerol. The effects of Ce/Zr molar ratio, reaction temperature, H2O/glycerol molar ratio and feed flow rate on catalytic performance were investigated. The results indicated that Ni/Ce0.6Zr0.4O₂ catalyst with the highest metal Ni dispersion exhibited good catalytic activity, selectivity and stability. The good stability of this catalyst is mainly attributed to the formation of Ce-O-Zr solid solution which can improve oxygen mobility in the support. TPO result showed that Ni/Ceo.6Zro.402 catalyst exhibited food resistance to carbon deposition.A series of Ni/Ce_xGd_1-xO_y (x=0.1,0.5,0.9) catalysts were prepared by impregnation method. This catalysts exhibited good catalytic activity for hydrogen production from glycerol steam reforming. The Ce/Gd molar ratio of support had some influences on catalyst activity. The result indicated that the Ni/Ce0.9Gd0.1O1.95 catalyst showed good catalytic activity for hydrogen production from glycerol steam reforming. Moreover, the effects of preparation conditions and reaction conditions (reaction temperature, H2O/glycerol molar ratio and feed flow rate) on catalytic performance were investigated. Ni/Ce0.9Gd0.1O1.95-S catalyst showed good catalytic activity for hydrogen production from steam reforming of glycerol. This catalyst has high Ni dispersion. The good stability for carbon deposition resistance of this catalyst is mainly attributed to the formation of Ce-O-Gd solid solution which can improve oxygen mobility in the support. The two factors make Ni/Ce0.9Gd0.1O1.95-S catalyst exhibiting good catalytic active, selectivity and stability.