Hydrogen by glycerol chemical looping reforming over Fe-based oxygen carriers derived from LaNi1−xFexO3-λ perovskite

Abstract

Hydrogen energy is now widely concerned as one of the new energy sources. Hydrogen production by using chemical looping steam reforming is an effective way. Fe-based oxygen carriers are widely used in chemical looping reforming for hydrogen production. However, pure Fe2O3 as the oxygen carrier has low activity and poor stability. In order to improve the activity and stability of the Fe-based oxygen carriers, the perovskite structure and the transition metal were introduced into the oxygen carriers for modification. The LaFeO3-λ oxygen carriers were subjected to B-site doping with metal Ni, Cu and Co, respectively. The effect of Ni doping content and metal species on the performance of hydrogen production were explored. The results show that, for the research of Ni doping content, the H2 selectivity of using LaNi0.1Fe0.9O3-λ is up to 91%. For 10 cycle tests of performance stability about oxygen carriers, H2 selectivity stabilizes at 90% and CO selectivity fluctuates in the range of 62%−84% using LaNi0.1Fe0.9O3-λ. On the whole LaNi0.1Fe0.9O3-λ shows higher reactivity than other types of oxygen carriers built in this research. This study provides a basis for the development of efficient oxygen carriers in the chemical looping steam reforming system.