Evaluation of the use of different coals in Chemical Looping Combustion using a bauxite waste as oxygen carrier

► A bauxite waste (BW) was identified as a promising oxygen carrier for iG-CLC of coal. ► BW showed high combustion efficiencies of gasification products using different coals. ► The use of recycled CO2 as gasifying agent should be limited except for lignite. ► In TGA, BW-char reaction extent was larger for chars from low rank coals. ► In fluidized bed, no significant evidence of BW-char reaction was observed.