The novel perovskite-type Ni-doped Sr0.92Y0.08TiO3 as a reforming biogas (CH4 + CO2) for H-2 production

Abstract

In this study, novel perovskite-type Sr0.92Y0.08TiO3-based catalysts were investigated for hydrogen production by the dry reforming of biogas (comprising CH4 and CO2). Ni-doped Sr0.92Y0.08TiO3 catalysts with improved catalytic activity were grown using the Pechini method. The prepared catalysts were characterized using X-ray diffraction to check for impurities introduced in the perovskite structure by doping method. The reforming of methane over perovskite-based catalysts has been extensively investigated; however, detailed understanding of the activating catalytic sites under different conditions is still lacking. To understand the details of the activating catalyst mechanism, transmission electron microscopy, temperature-programed reduction, X-ray photoelectron spectroscopic (XPS) analysis were performed under different activating conditions. XPS analysis of 5 mol% Ni-doped Sr0.92Y0.08TiO3 revealed that the H-2-activated catalyst lost active lattice oxygen sites and Ni sites due to formation of Ni hydroxide. Thus, the H-2-activated catalyst has lower catalytic activity than the N-2-activated one.