Influence of the preparation procedure parameters on the performance of Ni/γ-alumina catalysts for the biogas reforming reaction

摘要

Biogas is generated from the treatment of residual biomass, during the anaerobic digestion of organic matter; it is composed mainly of CH4 (60-65%) and CO2 (40-35%). It seems to offer an alternative raw material for hydrogen rich mixtures production via the catalytic reforming processes. As a consequence, studies are focused on catalysts' development, proven to be highly active and stable for a long period of lime. In order to improve the catalytic performance of the most common used, nickel supported on alumina catalysts, several parameters are modified; the characteristics of the supporting material, the active phase's loading, the catalyst's preparation method or the introduction of structural or surface promoters. In the present study Ni/y-alumina catalysts were prepared by the Equilibrium Deposition Filtration (EDF) technique with varying the process' experimental conditions. The physicochemical properties of the final catalysts were determined by X-ray Diffraction (XRD), Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) and H2 temperature-programmed reduction (TPR). Catalytic performance was evaluated using a feed gas mixture of CH4/CO2= 1.5 molar ratio, simulating a clean model of biogas, diluted with helium. The catalysts reveal differences in their structure and physicochemical properties, thus affecting their catalytic performance in the biogas reforming reaction.