Bi-metallic Ni–Fe LSF perovskite for chemical looping hydrogen application
Adam Zaidi, Christopher de Leeuwe, Vincenzo Spallina
Abstract
This work introduces a novel composite bimetallic perovskite Fe2O3-NiO/La0.6Sr0.4FeO3 as an oxygen carrier for chemical looping hydrogen production. The materials were tested in a 2-g packed bed reactor at different temperatures ranging from 500 to 900 °C and atmospheric pressure by alternating three-stage chemical looping hydrogen reactions. FeNi bimetallic interactions and La0.6Sr0.4FeO3 (LSF-641) resistance to carbon deposition resulted in a stable material with only a 2% oxygen capacity drop over 20 redox cycles. The modified LSF exhibited a 20 increase in H2 generation compared to LSF-641. These results demonstrate the effectiveness of doping Fe with Ni to generate more stable OC and the low H2 generation of LSF coupled with its greater redox cycling. Pre- and post-experimental (SEM-EDX) characteristics showed a homogenous distribution of Ni and Fe on the surface, thus confirming high stability to metal oxide cluster formation or sign of sintering.