In-situ CO₂ capture by DFMs to enhance hydrogen production and regeneration performance of biomass-H₂O gasification

Developing green hydrogen energy can alleviate the problem of CO₂ emissions caused by excessive use of fossil fuels. In-situ capture of CO₂ for enhanced H₂ production in zero-carbon energy biomass-H₂O gasification can achieve the dual effects of green H₂ production and negative carbon. The study used red mud (RM) to modify CaO and prepare dual-functional materials (DFMs). And the in-situ CO₂ capture enhanced H₂ production and regeneration cycle performance of DFMs in biomass-H₂O gasification were studied, and the influence of biomass ash on the H₂ production and low-temperature (650 °C) regeneration performance of DFMs in the cycle was analyzed. The results are as follows: In DFMs catalyzed biomass-H₂O gasification, due to the continuous deposition of alkali and alkaline earth metals (AAEMs) in biomass ash with increasing cycle times, its catalytic effect increased H₂ production by 27 % after twenty cycles, and the pore structure degradation and cycle stability of DFMs decreased by 44.71 %. DFMs have demonstrated excellent catalytic performance and cycling stability in the catalytic removal of ash from biomass. After twenty cycles, the production of H₂ only decreased by 20.59 % and the performance of CaO decreased by 26.67 %, demonstrating the enormous potential of DFMs for in-situ CO₂ capture and enhanced H₂ production.