Experimental and density functional study of sulfur trioxide formation catalyzed by hematite in pressure oxy-combustion

Experimental Investigation of Removal of SO3 from Flue Gas with Modified Fly Ash Adsorbents

“…With the implementation of increasingly strict environmental standards, ultraclean emission in coal-fired power plants has been extensively advocated and gradually realized. , In the past several years, studies related to mainstream pollutant emission from coal-fired power plants were mainly focused on nitrogen oxides (NO x ), sulfur dioxide (SO 2 ), particulate matter, Hg, etc . Nowadays, controlling nonconventional pollutant sulfur trioxide (SO 3 ), which is in trace amount in the flue gas has been receiving more and more attention. − With the combustion of high-sulfur coal and the application of oxy-fuel combustion for CO 2 capture and storage in power plants, the formation of SO 3 is enhanced. , Although the amount of SO 3 in flue gas is far less than that of SO 2 , its toxicity is ten times that of SO 2 . SO 3 is highly reactive and it can easily react with ammonia (NH 3 ) in a selective catalytic reduction (SCR) reactor to produce sticky ammonium bisulfate (NH 4 HSO 4 ), causing SCR catalyst deactivation, downstream air preheater plugging .…”

“… 4 − 6 With the combustion of high-sulfur coal and the application of oxy-fuel combustion for CO 2 capture and storage in power plants, the formation of SO 3 is enhanced. 4 , 7 Although the amount of SO 3 in flue gas is far less than that of SO 2 , its toxicity is ten times that of SO 2 . SO 3 is highly reactive and it can easily react with ammonia (NH 3 ) in a selective catalytic reduction (SCR) reactor to produce sticky ammonium bisulfate (NH 4 HSO 4 ), causing SCR catalyst deactivation, downstream air preheater plugging.…”