چكيده به لاتين
Most energy production industries generate carbon dioxide, a major greenhouse gas, by burning fossil fuels. Recently, due to the harmful environmental effects of carbon dioxide production and its increase by industries, there has been a greater need to separate carbon dioxide gas. One of the methods for carbon dioxide gas separation is surface adsorption by modified amine adsorbents. This method is widely used due to its adaptability and high efficiency. This research investigates the adsorption of carbon dioxide on modified-zeolite with two types of amines, tetraethylenepentamine (TEPA) and diethanolamine (DEA). The impact of various operating conditions, such as temperature, pressure, and the amount of amine, are examined. Isotherm, kinetic, and thermodynamic modeling in MATLAB software is employed to analyze the adsorption behavior. Then the experimental data are compared with existing models. BET, SEM, XRD, and FTIR analyses are employed to identify the adsorbents. The outcomes confirm the successful loading of amines onto the supports and the effectiveness of surface modification. Design Expert software is utilized to design the experiments, and the response surface method (RSM) is applied to optimize the conditions. The highest carbon dioxide adsorption on modified-zeolite using TEPA and DEA and unmodified zeolite is recorded as 9.2 and 9.4, and 7.4 mmol/g respectively, at 5 bar and 25°C. The experimental data of adsorption isotherms of modified zeolites show better agreement with the Freundlich model. The Elovich model is the most suitable adsorption kinetic model for both adsorbents, demonstrating better compatibility with the laboratory data. The thermodynamic parameters ΔH° and ΔG° exhibit negative values, indicating the exothermic and spontaneous nature of the adsorption process, respectively. Moreover, the negative value of ΔS° indicates a reduction in disorder during the process. Based on the results of this study, amine-modified adsorbents demonstrate efficient carbon dioxide adsorption capabilities.
