Boosting catalytic hydrolysis of carbonyl sulfide over K+ modified CeO2 nanospheres at low-temperature

Abstract

Carbonyl sulfide (COS) as one of typical atmospheric sulfur-containing pollutants widely emitted from various industrial processes, which has a significant impact on human health and environmental safety. Currently, developing highly efficient catalysts to eliminate COS is of great significance for both fundamental catalytic research and actual industrial application. Here we report a series of K+ doping spherical cerium oxide (CeO2-S) that showing promote activity for catalytic hydrolysis of COS. The research results demonstrated that the K+-doped CeO2-S formed more Ce3+ and oxygen vacancies than CeO2-S. The hydrolysis activity and stability of CeO2-S for COS were significantly improved by the introduction of K+. Among them, the 0.2 K/CeO2-S showed the optimal performance. Further in-situ DRIFTS results revealed that a slight increase in alkalinity could enhanced the activation of H2O over 0.2 K/CeO2-S, and the generated surface active hydroxyl groups reacted with adsorbed COS to produce the intermediate species (HSCO2-), leading to the formation of H2S and CO2. The catalysts prepared in this paper exhibited promoted activity with low-temperature and high stability for COS hydrolysis, which is beneficial for practical industrial scale-up applications and provides novel insights into designing efficacious catalysts with efficient low-temperature activity and superior stability for removing COS.