GAS STREAM TREATMENT PROCESS FOR MERCURY REMOVAL

A process of treating a gas stream containing at least one mercury compound or species, the process comprising: applying a composition into said gas stream ahead of a particulate matter collection device, wherein said composition contains a compound having the following formula (SiO 2 ) x (OH) y M z S a F, wherein (i) SiO 2 is an optional component; (ii) M comprises at least one of the following metal or metalloid cations: boron, magnesium, aluminum, calcium, titanium, vanadium, manganese, iron, cobalt, nickel, copper, zinc, zirconium, molybdenum, palladium, silver, cadmium, tin, platinum, gold, and bismuth; (iii) S comprises a sulfur-based species selected from at least one of the following: sulfide salts, dithiocarbamates, polymer-based dithiocarbamates, and polysulfide salts; (iii) F is an optional component and if present comprises at least one of the following: a functionalized organosilane, a sulfur-containing organosilane, an amine-containing organosilane, and an alkyl-containing organosilane at a surface area coverage of 0.01-100 %; (iv) the molar ratio of y/x is equal to about 0.01 to about0.5 and the molar ratio of x/z is equal to about 0.1 to about 300 if SiO 2 is present, and if SiO 2 is absent X is 0 and Z is 1; and (v) the molar ratio of a/z is about 0.5 to about 5.