Hydrogen production from steam reforming of ethanol over Ni/MgO-CeO_2 catalyst at low temperature

摘要

MgO,CeO2 and MgO-CeO2 with different mole ratio of Mg:Ce were prepared by solid-phase burning method.Catalysts Ni/MgO,Ni/CeO2 and Ni/MgO-CeO2 were prepared by impregnation method.The catalytic properties were evaluated in ethanol steam reforming(ESR) reaction.Specific surface areas of the supports were measured by nitrogen adsorption-desorption at 77 K,and the catalysts were characterized with X-ray diffraction(XRD),temperature programmed reduction(TPR) and thermogravimetric(TG).The results showed that well dispersed NiO,bulk-like NiO phase and NiO interacting with the support co-existed in Ni/CeO2 and Ni/MgO-CeO2.The catalysts supported on composite supports exhibited better performance than that on single supports,and the catalyst with the support of 1:1 mole ratio of Mg:Ce exhibited the optimum activity,selectivity and stability for ESR reaction at low temperature.