Study on structural characteristics and adsorption performance of ultrasonic treated Mn-containing sulfur transfer agent

To prepare manganese-containing spinel sulfur transfer agent with acid peptization, ultrasonic wave is used for the first time to modify the structure of sulfur transfer agent in this work. Mini fixed bed reactor was used to investigate the effect of ultrasonic power, time and temperature on the structure and oxidation adsorption performance of sulfur transfer agent and the adsorption kinetics and mechanism of SO2 were analyzed. SEM, TEM, XRD and N2 adsorption-desorption techniques were employed to characterize and analyse the function of sulfur transfer agent. The results indicated that manganese-containing spinel is a kind of promising sulfur transfer agent and exhibits higher sulfur capacity and desulfurization degree under the selected conditions of the ultrasonic wave power of 60%, and with the treatment period for 3 h at a temperature of 60 °C.

During preparation, Mn2+ is fully oxidized into Mn3+ in high-temperature roasting. In the process of oxidation adsorption, when Mn3+ serves as the active enter of SO2 oxidation, Mn3+ is reverted to Mn2+ and part of them displays +2.Figure optionsDownload full-size imageDownload as PowerPoint slide