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Abstract

Catalytically active carbons are used in cigarette filters for selective oxidation of selected gas phase components in cigarette smoke. The carbons are impregnated with transition metals and sulfur and/or nitrogen ligation. The catalytic activity of the carbon is significantly improved by introducing catalytically active sites by heat treatment in the range of 500-1000.degree. C. in the presence of transition metals and nitrogenous or sulfurous materials. Furthermore, introduction of such metalliferous sites into a active carbon can improve the absorptive affinity of the active carbon for classes of compounds, including aliphatic dienes and aromatic hydrocarbons.

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