Promotional effect of addition of ceria over yttria-zirconia supported Ni based catalyst system for hydrogen production through dry reforming of methane

Abstract

The idea of hydrogen production through dry reforming of methane (DRM) is simply outstanding as it is related to decrease the concentration of green-house gases. Yttria-Zirconia supported Nickel catalyst has thermal stability and mobile lattice oxygen but poor oxygen replenishment by CO2 to the reduced sites. Promotional addition of ceria adds catalytic merit as quick availability of lattice oxygen, good oxygen replenishment by CO2 to the reduced sites, and reducing bandgap. Herein, 1-3 wt% Ce promoted yttria-zirconia supported Ni catalyst is investigated and characterized by X-ray Diffraction (XRD), Raman, Infrared and UV–vis spectroscopy, CH4-temperature programmed surface reaction (CH4-TPSR) and cyclic H2TPR-CO2TPD-H2TPR experiment. The addition of 2 wt% ceria causes lower crystallinity of metallic nickel (than 1 wt% ceria) which facilitates wide range of CH4 decomposition sites (confirmed by CH4-TPSR). It additionally cultivates the mixed cerium zirconium oxide for resultant mixed potential and additional oxygen mobility. It ensures about 79% H2 yield.