Syngas production from the CO2 reforming of a waste cooking oil model compound over catalysts derived from La1−xSrxNiO3 perovskites

Abstract

Syngas production from waste cooking oil (WCO) based on reforming with CO₂ would allow the utilization of both resources. However, the catalysts used for reforming reactions (700–1000 °C) are prone to deactivation. In this work, La_1−xSr_xNiO₃ (x = 0.1, 0.2) perovskites were prepared as catalyst precursors, then reduced and used for CO₂ reforming of a waste cooking oil model compound (WCOMC). These materials exhibited stable catalytic activity during the reaction, attributed to the highly dispersed Ni⁰ nanoparticles on the La₂O₃ support and strong interactions between the metal and support. At 800 °C, the deposited amount of carbon on these catalysts decreased with increasing quantity of Sr doping into the A site of LaNiO₃ and the syngas had a H₂/CO ratio of 0.77. The present Sr-doped catalysts promoted the surface adsorption of oxygen along with the activation of C–H bonds. Most importantly, these materials strongly adsorbed CO₂ and facilitated the conversion of carbon deposition to gaseous products.