Fabrication of Titanium-based adsorbents based on Alumina Aerogel and eva‎luation of its performance in Carbon Dioxide adsorption

2/18/2025 12:00:00 AM

Nowadays, many adsorbents have been studied for carbon dioxide adsorption. However, not all of them are capable of industrialization due to the high cost of reconstruction and low reproducibility. Therefore, it is very important to find an adsorbent that can improve the temperature and regeneration time in addition to adsorption so that it can be extended to the industry. In this research, the adsorption of carbon dioxide by aerogel alumina-metatitanic acid adsorbent with different percentages was carried out in a batch reactor with adsorbent amount of 0.5 g for 60 minutes. To ensure the correctness of the synthesis, morphological and structural analyzes such as BET, SEM, FT-IR and XRD have been carried out. In order to achieve favorable conditions for its adsorption and optimization, the help of experiment design and five-level plan (CCD) was taken. The input components of this software are three parameters of temperature in degrees Celsius, pressure in terms of bar and weight percentage of metatitanic acid as a catalyst (without dimension) and an output component named gas adsorption rate in terms of (mmolCO2/gr sorbent) has been introduced. The range of temperature changes between 20 and 60 degrees Celsius, pressure between 1 and 7 bar and weight percentage of metatitanic acid between 0 and 100 were introduced. After doing the mathematical modeling and finding the effective components in the order of pressure, temperature and weight percentage, the optimization operation was done. The best adsorption result (mmolCO2/gr sorbent) was suggested as 17.558 at 20°C temperature, 7 bar pressure and 25% by weight of metatitanic acid, which had a slight difference of about 2% with the value suggested by experimental design (RSM). In the continuation of this research, regeneration was done at 3 different temperatures of 70, 100 and 130 degrees Celsius and also at different times of 30, 180, 330 and 720 minutes in a normal oven and the best result was obtained at a temperature of 100 degrees Celsius and a time of 30 minutes. Finally, isothermal and thermodynamic experiments were performed to achieve the best predictive model and thermodynamic conditions such as enthalpy, entropy and Gibbs free energy. The results showed that the Freundlich model was in good agreement with the laboratory results, and also from the negative values of enthalpy, entropy and Gibbs free energy, it can be seen that the absorption is physical, exothermic and spontaneous.

جذب سطحي كربن دي اكسيد (CO2) , بازسازي , اروژل‌ آلومينا , متاتيتانيك اسيد , بهينه سازي

Carbon dioxide (CO2) surface adsorption , regeneration , Alumina aerogel , Metatitanic acid , optimization

Abolfazl Shokri

Dr.Shahrokh Shahhosseini- Dr.Amin Bazyari