Enhanced generation of hydroxyl radicals by OMS-2 catalyst for flue gas absorption

Abstract

The successful removal of flue gas by the usage of highly stable OMS-2 nanoparticle have been studied in this work. Flue gas has the main component that is SOx and NOx which are considered hazardous gas it not only harms the environment but also badly affects human health. To alleviate the impact of SOx and NOx on the environment we suppose to use OMS-2 catalyst with Ozone. However, ozonation alone is not sufficient for simultaneous oxidation of SOx and NOx. Therefore, the most immediate requirement of this process is to enhance the hydroxyl radical generation that would decrease the overall ozone demand and rapid degradation of the pollutants. This would make the process more viable for commercial usage. In this work, the authors have tried to use as-synthesized octahedral molecular sieves (OMS-2) as the catalyst for the rapid generation of hydroxyl radicals in the ozonation process. Several studies have been reported in the past years for the integration of the ozonation process and the existing methods for the simultaneous treatment of SO2 and NO2. NO2 shows a high reactivity in ozonated water and the %conversion for the same was more than 85%. SO2 shows poor reactivity towards the ozonation process with a maximum conversion of 60%. However, it was observed that the addition of OMS-2 makes noticeable changes for both SO2 and NO2 %conversion. The catalyst enhances the •OH radical generation, and NO2&SO2% absorption reaches 88% and 97% respectively. The mechanism of generation of various reactive species by O3 and OMS-2 catalyst has been described in addition to that, it has been tried to optimize the usage of the OMS-2 catalyst and other operating parameters in this work.