Studies of the Adsorption of Gases by Charcoal. I. Variations due to Heat Treatment, Pre-equilibrium Effects

Harvey Brace Lemon
1919 Physical Review  
Problem.-By varying the heat treatment of a given specimen of cocoanut shell charcoal both the rate at which it adsorbs air and the total amount it can adsorb from a given small mass of air can be varied over a wide range. These variations are studied for the case in which the mass of air used is less than that required to saturate the charcoal. Activation.-An increase in the adsorptive power, "activation," is produced by repeated evacuations at 650° C, each evacuation being followed by an
more » ... ption of air at the temperature of liquid air. De-activation.-A decrease in the adsorptive power can be produced by increasing the evacuation temperature to between 8oo° and 900 0 C. Hypotheses.-Hypotheses advanced to explain these phenomena are discussed.
doi:10.1103/physrev.14.281 fatcat:g2ggp6mxdbdqfpweitzfa5frii