A Novel Biomass CO2 Gasification Process Assisted by Induction Heating for Co-Production of Porous Carbon and CO-Rich Syngas

Environmental challenges are becoming increasingly severe, and biomass energy, as a clean and renewable resource, plays a vital role in mitigating carbon emissions. The co-production of valuable CO-rich syngas and porous carbon via CO2 as the biomass gasification agent not only facilitates efficient conversion of solid biomass feedstock into high-value products but also enables the resource-oriented utilization of renewable biomass feedstocks. This study developed a new type of tube-sleeve-tube induction heating reactor, enabling efficient gasification of biomass in a CO2 atmosphere. Using the constructed experimental system, the CO2 gasification characteristics of corn stover in the tube-sleeve-tube induction heating reactor were investigated. It is confirmed that high temperatures favor the Boudouard reaction, thereby promoting the dry reforming of tar with CO2. At 1120 °C, the resulting syngas comprises 81.0% CO and achieves a volumetric yield of up to 1043.5 mL/g. Corn stover char generated at 1020 °C possesses optimal pore characteristics, featuring a specific surface area of 692.1 m2/g and a total pore volume of 0.439 cm3/g. Although higher gas agent flow rates and extended reaction time enhance syngas production, the evolution of the pore structure exhibits a distinct inflection point. The maximum CO2 adsorption capacity of gasification char reached 2.12 mmol/g. Notably, induction heating consumes only 39% of the energy required by conventional resistance heating under identical operating conditions, demonstrating substantial energy savings. Therefore, this process demonstrates broad potential for industrial applications.