چكيده به لاتين
In this research, we first tried to create a synthesis of silica-alumina aerogel with potassium carbonate and to investigate the absorption of carbon dioxide by this compound in a fixed bed reactor. To evaluate the amount of carbon dioxide adsorption by the resulting compound, it is necessary to first design the operating conditions. To do this, in the first step, we must first study the rate of characterization and calcination temperature. To do this, the rate of H2O / CO2 gas flow rate is one, temperature ℃ 60 and the combined rate of CO2 percentage is 2%, H2O% 2, N2 96%. The mixture is then calcined at three temperatures 600℃, 800℃ and 1000℃, which absorb at each temperature is 3.68, 6.18, 7.12 (mmol of CO2/g of sorb), respectively. In the next step, we examine the percentage by weight of potassium carbonate. This amount is from 10 to 30% by weight, which according to the operating conditions of the previous stage, the amount of absorption at 20% by weight is the best. Finally, modeling was done by RSM model, which was performed in 13 tests. In this section, two parameters are examined to obtain the optimal state. These two parameters include the absorption temperature and the H2O/CO2 flow rate. Its values are equal to 40-80 and 0.5-2, respectively. Testing with a coefficient of determination (<0.96), we conclude that the best temperature 60 and H2O/CO2 current intensity rate is 1.2. Finally, according to the mentioned operating conditions and the amount of adsorbent used, we conclude that with the mentioned amounts, the amount of adsorption reaches 7.2 mmol of carbon dioxide per gram of adsorbent after forty minutes. This amount is stable for 20 cycles of recovery and carbonization.