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 1372.    HEALEY, F. H., CHESSICK, J. J., AND ZETTLEMOYER, A. C.  Adsorption of Gases on Metals.  Am. Chem. Soc., 119th Meeting Abs., April 1951, p. 15 G.

       Reduced and unreduced samples of Mo powder were studied by means of B.E.T. adsorption techniques.  N, A, and O isotherms were measured at –195° and –183°.  The Mo sample, originally 99.9% pure, was reduced with H2 at several temperatures.  The chemisorption of O2 at –195° was taken to be a measure of the extent of reduced surface.  Samples reduced at temperatures below approximately 500° showed no ability to chemisorb O2, although there was an apparent increase in surface area.  At about 540° some sintering was noted.  Isosteric heats of adsorption were calculated for some of the reduced and unreduced surfaces.  The value of Vm for the unreduced surface was found to be the same for A, N, and O.  This finding led to a disagreement in areas calculated on the basis of closest packing of the adsorbate.