Comparative study on removal efficiency of impregnated carbons for hydrogen cyanide vapors in air depending on their phase composition and porous textures.

Activated carbons impregnated with Cu and Zn have been prepared. They are characterized and investigated with respect to their efficiency in the removal of HCN vapors in air. The effect of negligible amounts of Cr and pyridine present in the Cu-Zn impregnants has also been tested. The removal efficiency against HCN vapors in air of the samples obtained is proved to be comparable with that of standard ASC Whetlerite carbon. Carbons impregnated with Cu and Zn and containing additional components in their active phases appear to be advantageous as an alternative of the ASC Whetlerite carbons.