Kinetic Study on the SO2 Adsorption using Adsorbent CuO/γ-Al2O3

Abstract

Kinetic of SO 2 adsorption using adsorbent CuO/g-Al 2 O 3 has been studied with respect to the effect of SO 2 concentration and the amount of active phase on the kinetic of chemical adsorption between SO 2 and CuO. Adsorbent CuO/γ-Al 2 O 3 was prepared using the dry impregnation method with Cu(NO 3 ) 2 .3H 2 O solution on a commercial support, γ-Al 2 O 3 . Four types of the adsorbent CuO/g-Al 2 O 3 were prepared, with CuO contents represented as Cu of: 5, 8, 15 and 22%. Experiments on the adsorption were carried out at a temperature of 300°C. The model gas containing SO 2 with a concentration of 3000 or 18500 ppmv were passed at a constant flow rate in the range of 1.2 - 2.2 mL/sec through the bed of adsorbent for 1 hour. SO 2 adsorbed on CuO were analyzed based on the decrease in concentration of SO 2 between the inlet and the outlet of the adsorption column. The conversion of CuO to CuSO 4 was calculated based on the stoichiometry of reaction between SO 2 and CuO to form CuSO 4 . The increase in Cu content in the adsorbent decreased the conversion of CuO. In the adsorption using the model gas with SO 2 concentrations of 18500 and 3000 ppmv, the increase in Cu content in the adsorbent decreased the the reaction rate constant. Among various models under-consideration, the 3-D Difussion-Jander kinetic model was found to be the best to represent the experimental data.