CO2 hydrogenation is one pathway of CO2 utilization technology to reduce the CO2 emission. Many studies are reported on the development of CO2 utilization processes and catalysts. Especially, the CO2 hydrogenation, converting to useful chemicals usually lead to an exothermic heat generation which results in local thermal runaway and catalyst degradation. This study investigates CO₂ hydrogenation fluidized bed system, which is in excellent heat control through forced solid mixing, using Na promoted Fe-based catalysts (Na-Fe/Al₂O₃) fluidized bed material. The bed material was made from a spray dry method for the direct conversion of low-concentration CO₂. The catalytic reactions were performed in a bench-scale (6.35 cm dia.) reactor under various temperature (320–410°C), pressure (15–30 bar), fluidization velocity (2.5–4.5 U₀/Umf) and bed height (30–60 cm). A maximum conversion rate of 35% and an olefin ratio of 53.15% were achieved at 410°C and 20 bar. Temperature was found to be the most effective factor among others (p>???). In addition, 2 staged fixed bed reactor was developed to produce BTX chemicals over staged reactions of CO2 to methanol and methanol to BTX for practical operations. The operating conditions was temperature(210-300oC), pressure(~50bar) and GHSV(~5000 ml/g-h). The performance of the catalysts in a fixed bed reactor was better in CO2 conversion to C₅⁺ long-chain hydrocarbons than that in the fixed bed reactor. This study provides essential data for the development of high-efficiency fluidized bed processes and contributes to the advancement of direct CO₂ conversion technology.
