Steam reforming of glycerol over Ni/Mg/γ-Al_2O_3 catalysts Effect of calcination temperatures

摘要

The aim of this work is to study the catalytic activity of Ni(10%) based catalysts supported over a-Al_2O_3 modified with Mg (3%) for the steam reforming of glycerol. Catalysts have been prepared by incipient wetness impregnation method; analysing the effect of the calcination temperature of the modified support and the calcination temperature of the catalysts. Catalysts were characterized by temperature programmed reduction, (TPR), x-ray diffraction (DRX) and BET surface area. All catalysts were tested for this reaction in a fixed bed reactor. The best performance was achieved with the catalyst calcined at 500 ℃ being the optimum calcination temperature for the modified support of 900 ℃ This behaviour is ascribable to the formation of MgAl_2O_4 spinel which favours the dispersion of Ni°, responsible of the catalytic activity.