Mechanics of COS removal by adsorption and catalytic hydrolysis: Recent developments

Abstract

Due to its distinct physicochemical characteristics, carbonyl sulfide (COS) has emerged as a significant and challenging issue in flue gas treatment. Adsorption is a method that has become quite popular in modern research due to its benefits of ease of use, economy, and a wide range of adsorbents. The adsorption reaction mechanism varies based on the different adsorbents and adsorption reaction circumstances, and the process of adsorption of COS is highly complex. The most promising desulfurization method, catalytic hydrolysis is thought to be well suited for the removal of COS from industrial flue gas due to its benefits of high catalytic efficiency, relatively low reaction temperature, fewer side reactions, and non-consumption of hydrogen sources. Due to variations in catalysts and reaction conditions, many COS-catalyzed hydrolysis reaction pathways exist. In this study, the most popular techniques for removing COS are outlined, and the detailed reaction mechanisms for removing COS via adsorption and catalytic hydrolysis are covered. The goal of studying the reaction mechanisms for COS removal is to provide references for the design and study of the subsequent high-efficiency adsorbent and hydrolysis catalyst. This includes gaining a deeper understanding of the processes occurring in the reactions, the interactions between the reactants, and the laws of generating products, as well as understanding the mode of action between the adsorbents, catalysts, and reactants.