Promoting Effect of KIT‐6 to Support Ni‐Ce0.8Gd0.2O2‐δ as Efficient Coke‐Resistant Catalysts for Carbon Dioxide Reforming of Methane

Abstract

A series of Ni‐Ce0.8Gd0.2O2‐δ/KIT‐6 composites with various mass ratios were prepared by the impregnation approach. TEM and XRD characterization results revealed that the KIT‐6 support improved the distribution of Ni‐Ce0.8Gd0.2O2‐δ nanoparticles through the confinement effect of ordered mesopores of KIT‐6. XPS measurement showed that the concentration of surface oxygen vacancies in Ni‐Ce0.8Gd0.2O2‐δ/KIT‐6 composite was higher than that in KIT‐6‐free Ni‐Ce0.8Gd0.2O2‐δ. The catalytic test toward CO2 reforming of CH4 indicated that the Ni‐Ce0.8Gd0.2O2‐δ/KIT‐6 exhibited higher catalytic activity and stability over 100 h at 700 °C than Ni‐Ce0.8Gd0.2O2‐δ. The enhanced performance was demonstrated to be due to improved nickel dispersion and higher concentration of oxygen vacancies in Ni‐Ce0.8Gd0.2O2‐δ/KIT‐6, which reinforced the catalytic activity and decoking ability in the reforming reaction, thus boosting the durability of the catalyst.