Characterization of Ca-promoted Ni/α-Al2O3 catalyst for CH4 reforming with CO2 Original Research Article

In CH4 dry reforming, the influence of Ca on the activity of supported Ni catalyst depended on the properties of the supports (SiO2, α-Al2O3, γ-Al2O3) and on the amount of Ca added. Small amounts of Ca increased the activity and stability of Ni/α-Al2O3. Temperature-programmed reduction with H2 (H2-TPR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) characterizations of Ca-promoted Ni/α-Al2O3 catalysts indicated that Ca improved the dispersion of Ni, strengthened the interaction between Ni and Al2O3, and retarded the sintering. A higher amount of Ca covered the surface of α-Al2O3 and enhanced the decomposition of CH4.