Kinetics of NO absorption in aqueous iron (II)thiochelate solutions

Ferrous thiochelate solutions were used to absorb NO from flue gas. The absorption rates were studied as a function of pH with a double‐stirred reactor at 50°C. The rate constants of five ferrous thiochelates: Fe2+(dimercaptosuccinate)2, Fe2+(dithioloxalate)2, Fe2+(aminoethanethiol)2, Fe2+(cysteine)2, Fe2+(penicillamine)2, reacted with NO at pH5.5 and pH 7.0, have been determined. The implications of the kinetic data on the use of these iron thiochelate additives in wet flue gas desulfurization scrubbers: limestone, lime, and sodium, for simultaneous SO2 and NOx removal is discussed.