Syngas production from reforming of methane with CO_2 and O_2 over Ni/SrO―SiO_2 catalysts in a fluidized bed reactor

摘要

Nickel catalysts supported on different amounts of SrO modified SiO_2 were prepared and used in combined dry reforming and partial oxidation of methane in a fluidized bed reactor. This reaction was investigated under different temperatures, space velocities and feed gas composition. Results showed that the structure of the nickel active phase strongly depended on the interaction between Ni and the support, which was related to the support properties, the additives and the preparation methods. The catalysts were characterized using XRD, TPR, CO_2-TPD and TEM techniques. Ni sintering was a major reason for the deactivation of pure Ni/SiO_2 catalysts, while Ni dispersed highly on a 10 wt% Sr promoted Ni/SrO-SiO_2 catalyst. The enhanced interaction between Ni species and SrO-promoted support might be responsible for its high activity and good resistance to agglomeration of the nickel particles.