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.

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Literature Abstracts

1372. HEALEY, F. H., CHESSICK, J. J., AND ZETTLEMOYER, A. C. Adsorption of Gases on Metals. Am. Chem. Soc., 119^th 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 V_m 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.