Dynamic kinetic studies of CO2 capture using polyethyleneimine-modified cylindrical NaY zeolite in packed beds under ambient conditions

•Preparing cylindrical NaY-PEI adsorbent to capture CO2 under ambient conditions.•Adequate Avramic model describes the kinetics precisely.•Mathematical nonlinear modeling proves the potential of cylindrical NaY-PEI adsorbent. The development of effective carbon dioxide adsorbents is becoming increasingly important as global warming becomes a more serious issue. In this work, a cylindrical NaY zeolite modified with polyethyleneimine (PEI) was used to capture carbon dioxide (CO2) at ambient conditions in packed beds. A simulation system indoors was employed to assess the efficacy of PEI-modified NaY zeolite in capturing carbon dioxide. This system featured a self-assembled packed bed column operating under ambient conditions. The investigation included experimentation with various parameters, including PEI-loading, initial CO2 concentrations spanning from 500 to 2000 ppm, gas flow rate, and packed bed height. To ascertain the quantity of CO2 captured from the air, the obtained results were scrutinized using dynamic kinetic models. The findings revealed that, under favorable conditions, including a 10 % weight loading of polyethyleneimine (PEI), an initial CO2 concentration of 1000 ppm, a gas flow rate of 100 mL/min, and a packed bed height of 10 cm, PEI-modified cylindrical NaY zeolite exhibited the highest CO2 binding capacity at 6.12 mg/g. Additionally, it is worth noting that the dynamic capture of CO2 demonstrated excellent fitting through nonlinear regression analysis using the Avrami fractional kinetic model at ambient conditions (25⁰C and 101.325 kPa). The application of dynamic kinetic models proved valuable in understanding the mechanism and efficiency of CO2 capture by the modified zeolite. [Display omitted]