CO2 reforming of CH4 over M(Ca,Ba,Sr)xLa1-xNiO3 perovskites used as coke resistant catalyst precursor

Abstract

Methane and carbon dioxide are greenhouse gases that have been converted into synthesis gas for the production of oxygenated chemicals and hydrocar-bons. In this paper, M(Ca, Ba, Sr)xLa1-xNiO3 (x = 0.0, 0.3 and 0.5) doped per-ovskites were successfully synthesized as catalyst precursors aiming at high catalytic activity and stability in the CO2 reforming of methane. These perov-skites were characterized by X-ray diffraction (XRD), temperature programmed reduction by H2 (H2-TPR) and O2-temperature programmed oxidation (TPO). Its activity and carbon suppression were investigated in the CO2 reforming of methane. Results showed formation of perovskite structure, but La2NiO4 spinel and NiO were also detected in doped perovskites. The Ca, Ba and Sr partial substitution had evident influence on the reduction behavior of perovskites. All the doped perovskites used as catalyst precursors had better catalytic performance than LaNiO3. However, increasing the doping content decreased activity. Among doped perovskites, Ca0.3La0.7NiO3 showed better catalytic performance for the methane reforming reaction.