Abstract: Herein are disclosed compositions of matter, processes of manufacture and processes of use of solid state admixtures that include an inorganic base and a sulfide selected from the group consisting of an ammonium sulfide, an alkali metal sulfide, an alkali-earth metal sulfide, transition metal sulfide, and a mixture thereof. The composition can include solid state inorganic bases (e.g., calcium hydroxide and sodium sesquicarbonate) and/or gaseous bases (e.g., ammonia) and, optionally, a support material for one or more of the inorganic base and sulfide. The compositions are useful for capturing environmental contaminants, for example, from the flue gas of a coal fired power plant.

Abstract: Herein is described a composition effective for reducing the particulate resistivity of hydrated lime and capturing acidic gases from flue gas. The composition can include a supported carbonate that comprises 5 wt. % to 50 wt. % of a carbonate and 50 wt. % to 95 wt. % of a support; where the carbonate is an alkali metal carbonate selected from the group consisting of a carbonate, a bicarbonate, and a mixture thereof. The composition can be prepared by admixing the carbonate and the support with sufficient water and then drying. The composition can be used alone or with hydrated lime for reducing the concentration of acid gases in flue gas.

Abstract: A mercury capture system and method that includes the equipment for and the production of a mercury-sorbent metal sulfide in a flue gas conduit of a coal fired power plant. The system can include transition metal salt solution injection and sulfur solution injection apparati that can introduce transition metal salt solution and sulfur solution droplets (individually or as a co-injection) into the flue gas stream. The method can include the introduction (individually or as a co-injection) of a copper salt, an iron salt, and a sulfur compound into the flue gas stream, wherein the mercury-sorbent metal sulfide can be manufactured and reacted with mercury in the flue gas.

Abstract: Described herein is a process for oxidizing gaseous Hg(0) in the combustion gas from a coal fired boiler. The process includes injecting into the combustion gases a particulate mercury oxidant precatalyst. The process further including, oxidizing Hg(0) in the combustion gases to an oxidized mercury selected from the group consisting of Hg(I), Hg(II) and injecting a mercury sorbent that admixes with the oxidized Hg(II) to form a oxidized-mercury/sorbent species. The oxidized-mercury/sorbent species can then be collected from the combustion (flue) gas using standard powder capture technologies.

Abstract: A process of enhancing fly ash collection without adding SO3 to a flue gas can include providing a flue gas that includes fly ash and combustion gases from a coal fired boiler; injecting into the flue gas a particulate resistivity aid; and then collecting the fly ash and particulate resistivity aid with a cold side electrostatic precipitator (ESP).