Studies of activated charcoal cloth. V. Modification of pore structure by impregnation with certain transition metal salts and oxo-complexes

Samples of activated charcoal cloth have been prepared by pretreatment of viscose rayon with a number of transition metal oxo-complexes (Mo, V, and W) and chlorides (Fe and Co), followed by carbonization in nitrogen and activation in carbon dioxide at 850°C. Significant modification of both adsorptive properties and fiber morphology occurred, resulting in chars having a wide range of pore structure type according to the particular impregnant employed. The development of microporosity was limited in cases where overall char reactivity was enhanced. Sodium orthotungstate was found to induce the hollowing out of fiber ends during activation.