Dry reforming of methane on active and coke resistant Ni/Y2Zr2O7 catalysts treated by dielectric barrier discharge plasma简

摘要

In this study, Ni/Y2Zr2O7 catalysts prepared with impregnation method and treated by dielectric barrier discharge plasma（DBD） in different atmospheres have been investigated for methane dry reforming. It is revealed by H2-TPR that plasma treatment can enhance the interaction between Ni O/Ni particles and the Y2Zr2O7 pyrochlore support. Therefore, catalysts with smaller Ni O and Ni grains sizes, higher metallic Ni active surface areas can be achieved, as evidenced by XRD, TEM and H2 adsorption-desorption measurements. As a consequence, the plasma-treated catalysts show significantly improved activity, stability and coke resistance, as testified by the TEM and TGA-DSC results. Plasma treatment in H2/Ar gas mixture is found to be the best condition to prepare Ni/Y2Zr2O7, which can be used to obtain a catalyst with the highest activity, stability and most potent coke resistance. It is believed that the smaller Ni grain size and higher metallic Ni active surface area induced by plasma treatment are the inherent reasons accounting for the promoted reaction performance of the Ni/Y2Zr2O7 pyrochlore catalysts.