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Abstract Chemical looping gasification (CLG) is expected to act as an efficient novel technique realizing energy conversion, but solid fuel CLG suffers from inadequate fixed carbon conversion. Sufficient oxidant would be the grand cure for the torment that ever besets solid fuel CLG. We here reported a strategy to promote cotton fiber CLG to produce syngas with high H 2 /CO ratio by introducing methanol solution for supplying adequate H 2 O and CO. Experiments were performed under various oxygen excess number (Ω) at 850 °C. Ω around 0.3 favors the generation of syngas with high H 2 /CO ratio and high carbon conversion (η). Comparatively experiments concerning effect of methanol solution on cotton fiber CLG verified its significant promotion on syngas generation. Methanol solution can even play a more significant role than water to increase the H 2 /CO ratio and η from 5.64 to 71% to 6.82 and 87%, respectively, while H 2 /CO ratio and η for the direct cotton fiber CLG without water and methanol solution is only 1.28 and 29%. Stoichiometry and thermodynamics analysis further verified the possibility of cotton fiber CLG using methanol solution, which shows a double advantage of waste solution treatment and energy conversion. Highlights • Double advantage of methanol-cotton fiber CLG for waste solution treatment and energy conversion. • High H 2 /CO ratio syngas and carbon conversion. • Reaction stoichiometry and auto-thermal analysis. [ABSTRACT FROM AUTHOR]