Biogas Dry Reforming Over Ni-Mg-La-Al Catalysts: Influence of La/Mg Ratio

La/Mg ratio was evaluated in Ni-Mg-La-Al catalysts for the biogas dry reforming. The reactions were carried out in a fixed bed tubular reactor using synthetic biogas (70% CH(4)and 30% CO2). The catalyst characterization showed that the increase of La/Mg ratio decreased the specific surface area of the catalyst and the average crystallite size of Ni-0, but increased the acid strength of sites identified by NH3-TPD analysis. These properties contributed to improving the activity and catalytic stability for CH(4)conversion at 700 degrees C. The Mg presence increased the strength of basic sites of the catalysts and plays an important role in CO(2)conversion. The catalyst with La/Mg = 4 presented the best activity and stability for the reaction at 700 degrees C, due to the greater resistance to sintering associated with de small size of Ni-0, and a proper combination of acid and basic sites. H-2/CO ratios higher than 1 were obtained due to the contribution of the CH(4)decomposition reaction. Graphic