The adsorption of ethylene by silica has been investigated from 20 to 300°C. Over this range equilibrium is reached practically instantaneously in all cases. The adsorption of ethylene by reduced nickel has been investigated from —80° to 150°C. Definite slow effects and temperature hysteresis were observed. Since diffusion into the crystal lattice (``solubility'') is extremely unlikely in this case, more definite conclusions can be drawn than have been possible in previous investigations.
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