چكيده به لاتين
In this study, active alumina was modified using a potassium hydroxide solution to increase the carbon dioxide adsorption capacity. Experimental experiments for activated alumina adsorbent modified and active alumina with different parameters, such as various pressures of 2 to 10 bar and various temperatures of 20 to 80˚C, were repeated to obtain optimal adsorption. Thermodynamic, kinetic and isotherm modeling were performed. In thermodynamic modeling, ΔS°, ΔH° and ΔG° are negative for both materials. the reaction is exothermic, the amount of adsorption decreases with increasing temperature. The adsorption capacity at higher temperatures is lower than the adsorption capacity at lower temperatures. The highest adsorption rate for active alumina at 293˚K was obtained at about 85 mg/g and for modified active alumina at a temperature of 293˚K at 135 mg/g. The minimum adsorption for active alumina at 353˚K was about 20 mg/g and for the modified active alumina at 353˚K at 35 mg/g. As pressure increased, the adsorption rate increased. By increasing the amount of weight active alumina, the adsorption rate decreased, the highest adsorption rate was observed with 2 g of active alumina at about 85 mg/g and the lowest amount of adsorption was observed with 10 g active alumina at about 20 mg/g. Activated Alumina adsorbent modified with potassium hydroxide has a higher adsorption rate than active alumina. The results of the experiments performed in kinetic modeling for well-modified alumina at 293˚K with a pseudo-first order model at 323˚K and 353˚K with a pseudo-second order model were well-coordinated. In the isotherm modeling, the results of experiments were well coordinated with the models of Freundlich, Langmuir, and Hill.
