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.