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Pore size distribution of silica gel by employing different methods of calculation

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  • Colloid Science
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Summary

Pore-size distributions were evaluated from nitrogen desorption isotherms for 18 silica gels of various structural characteristics. Six computational procedures were employed; namely, BJH,Pierce, Cranston andInkley, Dollimore andHeal, John andBobra, andAllen. In each procedure three estimates oft-values were tried, these are:t-Halsey,t-de Boer, andt-Mingle andSmith. The firstt-estimate showed better agreement betweenS cum andS BET (± 5 %) for high surface area materials (>500 m2/g), with all of the computation procedures. The second estimate gave rise to higher cumulative surface areas in most of the cases. The thirdt-estimate resulted in satisfactory agreement betweenS sum, andS BET , when employed in combination with the exact methods of BJH andCranston andInkley. The approximated expressions ofPierce, andJohn andBobra generally display poor agreement between cumulative and experimental values. A simplified method described byAllen is recommended for rapid comparisons of industrial porous solids.

Zusammenfassung

Aus N2-Adsorptionsisothermen an 18 verschiedenen Silicagelen wurden die Porengrößenverteilungen ermittelt. Dazu wurden sechs Rechenmethoden eingesetzt; und jede Methode wurde für drei verschieden bestimmtet-Werte (nachHalsey, de Boer undMingl-Smith) durchgeführt. Mit dent-Werten vonHalsey wird bei Stoffen mit hoher spezifischer Oberfläche (>500 m2/g) mit allen sechs Rechenmethoden eine gute Übereinstimmung vonS cum undS BET (± 5 %) erreicht. Diet-Werte nachde Boer geben in den meisten Fällen höhere Werte vonS cum. Mit dent-Werten vonMingl undSmith wird eine befriedigende Übereinstimmung zwischenS cum undS BET erreicht, wenn sie in Kombination mit den exakten Methoden nach BJH undCranston undJnkley angewandt werden. Eine vonAllen beschriebene vereinfachte Methode wird für schnelle Vergleichsmessungen an technischen porösen Stoffen empfohlen.

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  1. Laboratory of Surface Chemistry, National Research Centre, Dokki, Cairo, Egypt

    B. S. Girgis

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Girgis, B.S. Pore size distribution of silica gel by employing different methods of calculation. Colloid & Polymer Sci 256, 563–572 (1978). https://doi.org/10.1007/BF01639201

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  • DOI: https://doi.org/10.1007/BF01639201

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