Pollutant emission control sorbents and methods of manufacture and use

摘要

Sorbents for removal of mercury and other pollutants from gas streams, such as a flue gas stream from coal-fired utility plants, and methods for their manufacture and use are disclosed. Embodiments include brominated sorbent substrate particles having a carbon content of less than about 10%. Other embodiments include one or more oxidatively active halides of a nonoxidative metal dispersed on sorbent substrate particles mixed with activated carbon in an amount up to 30% by weight. Further embodiments include physical blending of a flow modifier into the sorbent composition.

主权项

1. A sorbent composition for removal of mercury from a flue gas, the sorbent composition comprising:
one or more bromides of a nonoxidative metal dispersed on porous particles, wherein the nonoxidative metal is selected from the group consisting of sodium, potassium, calcium, magnesium, and combinations thereof, and wherein the one or more bromides are dispersed on the porous particles according to a drying process; and a flow modifier physically blended with the porous particles in an amount sufficient to reduce agglomeration of the porous particles when injected into the flue gas, wherein the porous particles are selected from the group consisting of alumina, silica, titania, zirconia, iron oxides, zinc oxide, rare earth oxides, metal carbonate, metal sulfate, aluminosilicates, zeolites, clays, heat-treated clays, chemical-surface modified clays, talc, fly ash, fluid cracking catalyst (FCC) particles, dirt, and combinations thereof.