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    A New Method for Measuring the Surface Areas of Finely Divided Materials and for Determining the Size of Particles

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    During the past few years a method for measuring surface areas of iron synthetic ammonia catalysts by means of low-temperature adsorption isotherms has been developed (1, 2) and found applicable to other metallic catalysts (3, 4), to a variety of nonmetallic porous adsorbents, and to finely divided nonporous solids (6). Since the method is comparatively simple and rapid in operation and appears to give reliable results, it has seemed worth while to describe it in detail in the present paper and to compare the values that it yields for surface areas and average particle size with those obtained on the same samples of finely divided solids by other entirely different types of measurement. It may be stated by way of anticipation that the results of such a comparison are so striking as to warrant the prediction that the low temperature gas adsorption method for measuring surface area and particle size will find wide application in industrial and scientific work.

    Author Information:

    Emmett, P. H.
    Professor, The Johns Hopkins University, Baltimore, Md

    Committee/Subcommittee: E01.94

    DOI: 10.1520/STP43899S