A Ce-doped Fe−Mn magnetic sorbent (Fe 6 Mn 0.8 Ce 0.2 O y ) was developed using the coprecipitation method. The effects of O 2 , H 2 O, flue gas temperature, SO 2 concentration, and Ce doping on the SO 2 tolerance of the Fe 6 Mn 0.8 Ce 0.2 O y sorbent for mercury removal were explored in a fixed-bed system. Combined with mercury temperature-programmed desorption (Hg-TPD) and X-ray photoelectron spectroscopy (XPS) analysis, the mechanism of mercury removal by the Fe 6 Mn 0.8 Ce 0.2 O y sorbent in the presence of SO 2 was analyzed. The results show that the Fe 6 Mn 0.8 Ce 0.2 O y sorbent is a promising sorbent for circulating mercury removal with high SO 2 tolerance. Ce doping significantly enhances the SO 2 tolerance of the Fe 6 Mn 0.8 Ce 0.2 O y sorbent for mercury removal by protecting the Mn 4+ active sites from SO 2 poisoning. This is because Ce has a stronger affinity with SO 2 compared to that of Mn, and most of SO 2 will preferentially react with CeO 2 instead of MnO 2 to form Ce 2 (SO 4 ) 3 . O 2 in flue gas improves the SO 2 tolerance of the Fe 6 Mn 0.8 Ce 0.2 O y sorbent by timely supplementing the oxygen vacancies. H 2 O coexisting with SO 2 in flue gas further reduces the mercury removal rate because of the competitive adsorption between H 2 O and mercury. Mercury is mainly adsorbed by MnO 2 in the Fe 6 Mn 0.8 Ce 0.2 O y sorbent by the Mars−Maessen mechanism, and SO 2 in flue gas causes the generation of a small amount of Hg 2 SO 4 and HgSO 4 .
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.