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Literature Abstracts

 1470.    HOLMES, J. AND EMMETT, P. H.  Alteration of the Size and Distribution of Pores in Charcoals.  Jour. Phys. and Colloid Chem., vol. 51, 1947, pp. 1276-1307; Chem. Abs., vol. 42, 1948, p. 1102.

        Pore-size and surface-area alterations produced in 4 gas-mask charcoals by various combinations of steaming, hydrogenation, oxidizing, sintering, or impregnating with NiO, CuO, Mo₂O₃, Na₂CO₃, Fe₂O₃, or Cr₂O₃ were studied.  Adsorption isotherms for N₂ at –195° were used to judge the changes in pore-size distribution and surface area.  The samples included 2 charcoals made by the ZnCl₂ process, 1 steam-activated coconut shell charcoal, and 1 made from coal by a combination of calcination and steam activation.  The various treating procedures are discussed in terms of 6 possible types of pore alteration that can be produced.  The results can be summarized by saying that suitable combinations of the treating process seem capable of increasing the relative proportion of any particular size of pore that it is desired to produce in the charcoals.