Effect of hierarchical pore structure of oxygen carrier on the performance of biomass chemical looping hydrogen generation

Biomass chemical looping hydrogen generation is known as a promising technique that converts biomass and water into hydrogen with inherent CO2 separation. In this study, effect of hierarchical pore structure of oxygen carrier on the performance of the biomass chemical looping hydrogen generation is investigated. The results show that oxygen carrier Fe2O3/Al2O3 with 0.09 g poly (ethylene oxide) can simultaneously improve the redox stability and activity. The hydrogen production of Fe2O3/Al2O3 with 0.09 g poly (ethylene oxide) and Fe2O3/Al2O3 without poly (ethylene oxide) are 343 ml H2/g oxygen carrier and 79 ml H2/g oxygen carrier, respectively. The above results are attributed to the hierarchical pore structure of the Fe2O3/Al2O3 with 0.09 g poly (ethylene oxide), which can create more active sites and prolong the contact time between the reactant and the oxygen carrier. Furthermore, the hierarchical pore structure of the oxygen carrier studied in this paper can be extended to design high active and stable oxygen carrier.