Chemical looping steam reforming of bio-oil for hydrogen-rich syngas production: Effect of doping on LaNi0.8Fe0.2O3 perovskite

Chemical looping steam reforming of bio-oil is novel conversion technology utilizing waste energy, which is an advantage to reduce cost and improve environmental. However, complex reaction process between oxygen carrier and bio-oil constrain its development. In this study, perovskite based La 0.8 M 0.2 Ni 0.8 Fe 0.2 O 3 (M = Ca, Ce and Zr) were investigated as an oxygen carrier for chemical looping steam reforming of bio-oil model reaction. The perovskites were prepared via sol-gel method and the effect of doping for reforming of acetic acid as bio-oil model compound is also investigated. Among all the perovskite tested, Ce doped La 0.8 Ce 0.2 Ni 0.8 Fe 0.2 O 3 oxygen carrier gave superior and stable catalytic performance for 1440 min at 600 °C and steam/carbon mole ratio (S/C = 2). The fresh and spent oxygen carriers were characterized using XRD , H 2 -TPR, CO 2 -TPD, TG-DTG, Dielectric constant , Raman, XPS and XANES . Doping with base metal generally, improved coke resistance ability of the perovskite. CO 2 -TPD and XPS analysis reveal that the highest carbon resistance for La 0.8 Ce 0.2 Ni 0.8 Fe 0.2 O 3 perovskite is due to enhanced stronger surface basicity and oxygen adsorption. From DFT simulation and Dielectric constant results, the better activity for La 0.8 Ce 0.2 Ni 0.8 Fe 0.2 O 3 is attributed to its adsorption ability of reactants, oxygen and electron transfer from sub-surface to surface of the perovskite.