Enhanced catalytic activity for methane dry reforming of Ce-doped Ba0.9Zr0.7Y0.2Ni0.1O3-δ perovskite catalyst

Abstract

Dry reforming of methane (DRM) holds great economic value and environmental protection significance. In our previous study, an in-situ reduced Ni-doped BaZrO3-δ-based catalyst was used as the DRM reforming layer, which exhibited remarkable coking-resistance. To further enhance its DRM catalytic activity and durability, Ce was doped at the B-site of Ba0.9Zr0.7Y0.2Ni0.1O3-δ, and the positive effects of Ce doping on DRM catalytic activity was investigated. Among the various Ce-doped catalysts, the perovskite catalyst with a Ce doping amount of 20 mol. % (i.e., Ba0.9Zr0.5Ce0.2Y0.2Ni0.1O3-δ) demonstrated the highest catalytic activity. At 750 °C, the CH4 and CO2 conversions reached as high as 80.1 % and 85.3 % respectively. Additionally, this catalyst exhibited excellent DRM catalytic durability, and no coking was detected after a 60 h durability test at 700 °C. The enhanced DRM catalytic activity and high coking-resistance can be attributed to the increased concentration of oxygen vacancies, improved hydration capacity, and enhanced CO2 adsorption capacity. The Ce doping in perovskite catalysts provides valuable insights for the construction of DRM catalysts with superior catalytic activity and durability.