Catalytic Conversion of Tar Compounds from Biomass over Modified Ni/Olivine Catalysts

Abstract

This study investigated the improving catalytic effects during tar catalytic reforming by impregnated NiO and CeO2 onto olivine, and the further reduction of carbon deposition on the catalysts was achieving by the addition of MgO. A series of characters of the catalysts were tested by XRD, TPR and TPD. The experimental results showed the addition of MgO could improve the resistance to carbon deposition and had demonstrated higher reaction activity at higher temperature and lower water-carbon ratio. The activities of catalysts were not only related to the impregnating order of the promoters NiO and CeO2 but also to the water (steam)-carbon ratio (S/C). Those catalysts impregnated Mg, Ce and Ni in order could achieve highly disperse sites and further promote the interaction between active sites and carriers. Furthermore, those catalysts also had higher reaction activity and better anti-coking abilities under low water (steam)-carbon ratios.