Polymeric iron chelates for nitric oxide removal from flue gas streams

Kinetic Study of Ambient-Temperature Reduction of FeIIIedta by Na2S2O4

“…1,2,4-13 Another one, nitrilotriacetic acid (nta), has been employed to a much lesser extent. 8,[14][15][16] The following compounds were also tested as ferrous ion ligands: (i) acetyl acetonate, 4 (ii) citrate, 4 (iii) a polymeric chelate, 17 (iv) dithiocarbamates, 18 (v) cysteine, 19 (vi) amino acids and peptides, 20 (vii) immobilized resins, 21 (viii) bis(2,3-dimercapto-1-propanesulfonate), 22 and (ix) tiochelate. 23 The ferrous chelate enables nitric oxide to form Fe II -(L)(NO), nitrosyl ferrous chelate, in an aqueous solution.…”

“…The chelate method can provide simultaneous removal of NO x and SO 2 in one absorption step by scrubbing flue gases by aqueous solutions of ferrous chelate, Fe II L, iron(II) ion coordinated to a ligand, L. Only ethylenediaminetetraacetic acid (edta) has been widely investigated as the ligand of ferrous ions in this system. ,,− Another one, nitrilotriacetic acid (nta), has been employed to a much lesser extent. ,− The following compounds were also tested as ferrous ion ligands: (i) acetyl acetonate, (ii) citrate, (iii) a polymeric chelate, (iv) dithiocarbamates, (v) cysteine, (vi) amino acids and peptides, (vii) immobilized resins, (viii) bis(2,3-dimercapto-1-propanesulfonate), and (ix) tiochelate …”

Experimental Investigation on the Kinetics of NO Complex Absorption through FeIIEDTA Solvent in a Double-Stirred Reactor

“…Rate Constant k. The complex absorption of NO in Fe II EDTA is a fast pseudo-first-order reaction. 29 As a result, the rate constant k under different operational conditions is from eq 13…”

Removal of nitrogen oxide (NOx) and sulfur dioxide from flue gas using aqueous emulsions of yellow phosphorus and alkali

“…Research efforts to modify existing wet FGD processes for the simultaneous control of S02 and NOx emissions have led to several new approaches to enhance NO, absorption in scrubbing liquors. These include the oxidation of NO to the more soluble N02 using oxidants such as 03 and C102 (2) and the addition of various iron (II) chelates to the scrubbing liquors to bind and activate NO (2)(3)(4)(5)(6)(7)(8)(9). Despite high removal efficiencies of both S02 and NO,, none of these methods has been demonstrated to be cost effective to date.…”

“…n2o4 + h2o -hno2 + HN03(9) where M is a another molecule, which remains unchanged after the reaction. The proposed mechanism is consistent with the finding that 02 is required for the NO absorptionEnviron.…”