Comparison of Gelatinous and Calcined Magnesia Supported Ni or/And Co-Based Catalysts for Aqueous Bioglycerol Phase Reforming

Abstract

In this study, glycerol aqueous phase reforming was carried out in a batch reactor. The gases produced were H₂, CO, CH₄, and CO₂ during the experiment. The catalysts used included Ni or/and Co catalysts supported by MgO. Meanwhile, two different MgO supporters were prepared by the sol-gel method and calcining method, and the active metal was added by an initial wet impregnation (IWI) method. The catalysts were characterized by BET, BJH, TEM, and XRD. In order to achieve the purpose of comparison, the activity of different types of catalysts was tested under similar conditions. It was found that the amount of hydrogen produced by the catalyst containing gelatinous MgO supporter is more than 1.5 times that of other catalysts, and the Ni-Co-MgO had the best catalytic effect among the same types of catalysts. The activity of the Ni-Co-MgO catalyst was tested under different temperatures, concentrations, and CaO conditions. We found that Ni-Co bimetallic catalyst supported on gelatinous MgO has the best highest gas production, while the catalyst containing calcined MgO support usually has a better hydrogen selectivity. Through the stability study of the Ni-Co-MgO catalyst, we found that the bimetallic catalyst supported by gelatinous MgO support has better catalytic stability.

Keywords: Bioglycerol, Hydrogen production, Aqueous-Phase Reforming, Sol-gel method, Nickel - cobalt catalysts