The world is witnessing a rapid growth in population and energy consumption, and is faced with the responsibility of minimizing greenhouse gas emissions. This research investigates an innovative way of producing hydrogen enriched synthesis gas (syngas) from biomass using fluidized bed technology and in-process carbon capture. Eggshell is highly rich in calcium carbonate, suggesting that the material is potentially an attractive biosource of lime and thus is used as a source of CO₂ sorbent in the gasification studies. Sawdust was used as the biomass in the gasification experiments. Investigation showed that increasing the calcined eggshell to biomass ratio (CEBR) provided more calcium oxide (CaO) to the process, promoted CO₂ uptake and enhanced hydrogen enrichment. A minimum CO₂ concentration of 3.3% and a maximum hydrogen concentration of 78% were obtained at a temperature of 650°C, steam to biomass ratio (SBR) of 1.2 and CEBR of 1.0. Experiments for obtaining the calcination and carbonation kinetic parameters of the eggshell were conducted by following the recommendations made by the Kinetics Committee of the International Confederation for Thermal Analysis and Calorimetry (ICTAC). It is important to properly manage available energy facilities before biohydrogen becomes fully commercialized. With this in mind, another part of the research is on the gasification of biomass in an atmosphere of steam and CO₂. The captured CO₂ from the first part of the research can be utilized in this part. This investigation promotes the valorization of a greenhouse gas (CO₂) and enhances the production of syngas with a flexible H₂/CO ratio for various applications. It was found that the inclusion of CO₂ as a co-gasifying agent promoted CO evolution, reduced H₂ concentration, and consequently decreased the H₂/CO ratio. The ratio reduced with a rise in temperature, increased with increasing CO₂ to biomass ratio (CBR), and showed no significant change with pressure. A CBR of around 0.6 would be an optimum value for Fischer-Tropsch synthesis to achieve a H₂/CO of 2:1, but the CBR should be lower for processes requiring a lower H₂/CO ratio like acetic acid formation and oxo-synthesis.