Catalytic Effect of Ni and Fe Addition to Gasifier Bed Material in the Steam Reforming of Producer Gas

Abstract

The removal of tars from producer gas in a biomass gasification process is a challenging task, due mainly to the poor reforming activity of bed materials used in gasifiers. In this study, the steam reforming performance of Ni- and Fe-catalyzed gasifier bed materials is evaluated. Experiments are performed with the bimetallic catalysts, with overall metal loading as low as 1.00 wt %, in a lab-scale fixed-bed reactor between 700 and 900 °C. The addition of Fe to Ni results in smaller crystallites of NiO on the calcined catalysts. The reduced bimetallic catalysts show an improvement in the metal surface area and metal dispersion in comparison to the catalyst containing only Ni. The enhancement is possible with intimate contact of Ni and Fe, and it is found to be limited by their relative amounts. The catalyzed bed materials display higher conversion for C7H8 and C2H4 than the base material but lower CH4 conversion. The steam reforming of the producer gas tars show strong dependence on the reaction temperatur...