Kinetic Studies and Statistical Design of CO₂ Capture Process from Stream of Gas Mixture at Elevated Temperature Using Composites of Nanoparticles

Abstract:

Chitosan and clay materials of 50:50 ratio, produced and characterized from periwinkle shells and clay soil, was applied to capture CO₂ from gas mixture at elevated temperatures (50^OC to 250^OC) in a column bed, packed with the particles of dimension length 1.5 (m), and inner diameter 0.02 (m). The composition of gas mixture are 0.003, 0.002, 0.05, 0.15, 0.02, and 0.76 for CH_4, C₂H_6, H_2, CO_2, H₂O vapour, and N_2, respectively at condition of pressure 49 (kPa), temperature 250^OC, and flow rate 75 (L/min) from exhaust column into the column bed for adsorption process. The kinetic and isotherm models are adopted and simulations performed from the experimental data to determine suitable adsorption parameters for the process. Also, Aspen plus and statistical optimization tool to simulate the experimental data are utilized to determine the optimal yield and conditions of factors. The coefficient of determination of 0.992 showed that the quadratic model is best suitable for the combination of parameters and fitted well, while the optimization result gave significant difference among the bed height, temperature and time and their interactions. The result revealed that the adsorption process best followed Elovich kinetic and fitted well in the Freundlich multilayer adsorption isotherm with parameters 0.0187 (mg/g.hr), 175.932, and 1.5 for the kinetic constant, adsorption constant, and intensity respectively. The root means square errors and deviation values gave negligible values of 0.166; 0.045, and 0.0345; 0.0094 for the design/simulation; optimization models applied, when compared to the experimental data. The regression results of the factors analysis showed that the model R² of 0.995 is more reliable and fitted well than the modified R² of 0.985 and the estimated R² of 0.965. The central composite design for the optimization of the process gave maximum yield of 0.9411 at suitable combine time and temperature factors effect. Aspen plus simulation result gave yield of 0.9831 CO₂ removed from optimal conditions of time, temperature, and bed height of 2.8 (hrs), 155.6°C, and 3.44 (cm) respectively. It was noticed that N₂, CH₄, C₂H₆, and water vapour were removed from the gas mixture of yields 0.9972, 0.9832, 0.9831, and 0.9947 respectively.

• Periodical: Advanced Materials Research (Volume 1188)
• Pages: 131-146
• DOI: https://doi.org/10.4028/p-R1YJve
• Online since: February 2026
• Authors: Ojong Elias Ojong*, Odey David Adoga, Uloma Catherine Anaba, Silas Shamaye Samuel, Raymond Rowland Ana, Odey Ade Osha
• Keywords: Adsorptions, Chitosan/Clay Materials, CO₂ Capture, Kinetic Studies, Statistical Design

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