The adsorption of hydrogen cyanide by impregnated activated carbon cloth. Part II: Reactivity of impregnated metal carboxylates towards hydrogen cyanide

Add time:08/11/2019    Source:sciencedirect.com

Activated carbon cloth was impregnated with the formates, acetates, and propanoates of manganese, cobalt, nickel, copper, and zinc. Impregnated cloth samples were challenged with 1 L min−1 2 mg L−1 HCN in air in a test rig. The effluent gas was sampled every 2 min, the sample separated on a gas chromatograph and the cyanogen and hydrogen cyanide concentrations determined. Breakthrough curves were obtained that gave an indication of the usefulness of the impregnation for HCN removal from air.The behavior of all the carboxylates was consistent with a model based on reaction of HCN with saturated aqueous solution of the metal carboxylate on the charcoal surface. Storage at 60°C and 80% RH for 14 days resulted in hydrolysis of the metal carboxylate with precipitation of what were probably hydroxide species of the metals. These were much less reactive towards HCN, and breakthrough times diminished accordingly. Cobalt and nickel acetates proved to be the most efficient impregnants for the removal of HCN from air.

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