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The objective of this study is to obtain data on the rates and the extent of sulfation reactions involving partially sulfided calcium-based sorbents, and oxygen as well as sulhr dioxide, at operating conditions closely simulating those prevailing in the second stage (combustor) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the C02 partial pressure generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, calcium sulfate isdoi:10.2172/28261 fatcat:wfooca64jbgstl4a74eusvahye