Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1996-02-28
1998-04-28
Williams, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
738655, G01N 1508
Patent
active
057446997
ABSTRACT:
A method and an apparatus for adsorption measurement suitable for a small-surface area determination are disclosed. The apparatus includes (a) a temperature-compensated constant-volume adsorption apparatus including: a pair of a reference buret and a sample buret of almost equal shapes and volumes disposed in a lateral symmetry, a pair of a reference adsorption cell and a sample adsorption cell of almost equal shapes and volumes disposed in a lateral symmetry and connected to the reference and sample burets, respectively, the sample cell containing a sample for adsorption measurement, an adsorbate gas supply connected to the reference and sample burets so as to supply an adsorbate gas to the burets, and a pressure gage capable of measuring pressures within the reference and sample burets. The measurement includes the steps of (b) introducing an adsorbate gas into the burets, (c) causing the adsorbate gas in the burets to expand into the respective adsorption cells, and (d) determining an adsorbed amount of the adsorbate gas by the sample cell based on a pressure difference between the burets while compensating for an adsorbed amount by the reference adsorption cell.
REFERENCES:
patent: 4972730 (1990-11-01), Camp et al.
patent: 5074146 (1991-12-01), Orr et al.
patent: 5133219 (1992-07-01), Camp
Suzuki, "Temperature-Compensated, Differential Tensimeter For Measuring Gas Adsorption By Low Surface Area Solids", Rev. Sci. Instrum. 53(7), Jul. 1982, pp. 1061-1066.
Suzuki et al., "Direct Determination Of Effective Bet-Area Of Xe, Kr, and Ch.sub.4 ", Journal of Catalysis 155, 163-165 (1995).
Suzuki, "Measurement of 1 cm.sup.2 Surface Areas By Krypton Adsorption Using An Adsorption Apparatus With A Temperature-Compensated, Differential Tensimeter Of Symmetrical Design", Rev. Sci. Instrum. 66 (10), Oct. 1995, pp. 5070-5074.
Politzer Jay L.
Williams Hezron E.
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