Chemical looping gasification of lignin with bimetallic oxygen carriers

•BaFe2O4 demonstrated the best ability to selectively gasify lignin and with a high syngas production.•Four bimetallic oxygen carriers (CaFe2O4, CaMn2O4, BaFe2O4 and BaMn2O4) showed the ability to be fully regenerated in air after reduction.•CO2 enhances the gasification process with these oxygen carriers.•Bimetallic oxygen carriers accelerated the kinetics of gasification process.