Examining the effect of zirconium doping in lanthanum nickelate perovskites on their performance as catalysts for dry methane reforming
Gema Gil-Muñoz, J. Alcañiz-Monge
Abstract
This study evaluates the viability of Zr doping in Ni-based perovskites as a precursor for dry reforming of methane (DRM) applications. X-ray diffraction results indicate that the solubility of Zr in the LaNiO₃ perovskite structure can reach up to 25 % on B-sites; however, the formation of new crystalline phases is observed when the Zr content increases to 50 %. The presence of Zr has been found to significantly enhance the catalytic activity of these samples, which exhibit the highest conversions rates despite their reduced Ni content. Furthermore, they demonstrate high temporal stability and an absence of carbonaceous deposit formation. These properties are attributed to a strong interaction between Ni and Zr species. However, excessive SMSI, as observed in Ti-bearing perovskite, may lead to a reduction in catalytic activity. Additionally, it has been observed that the presence of Zr influences the growth mechanism of the carbon nanotubes on Ni, shifting from tip-growth to a pulse-growth mechanism. • Zr substitution into B position of the perovskite can reach up to 25 %. • Zr enhance the catalytic activity and stability of perovskite precursor. • Zr confer a high resistance to Ni nanoparticles against carbon deposition. • Zr affects the growth mechanism of the carbon nanotubes on Ni.