The role of external surface activity in the effectiveness of zeolites

Small zeolite crystals may have a substantial fraction of their active sites located on the crystal exterior. Catalytic characterization of these small crystals in cases where intracrystalline diffusion limitations are significant requires a consideration of the contributions of both the external su...

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Veröffentlicht in:	Ind. Eng. Chem. Res.; (United States) 1988-01, Vol.27 (1), p.45-47
Hauptverfasser:	Farcasiu, Malvina, Degnan, Thomas F
Format:	Artikel
Sprache:	eng
Schlagworte:	400201 - Chemical & Physicochemical Properties ACTIVATION ENERGY CATALYTIC EFFECTS Chemistry CRYSTALS DIFFUSION ENERGY Exact sciences and technology General and physical chemistry INORGANIC ION EXCHANGERS INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ION EXCHANGE MATERIALS Ion-exchange MATERIALS MATHEMATICAL MODELS MINERALS Other ion exchangers: preparations and properties Surface physical chemistry SURFACE PROPERTIES ZEOLITES Zeolites: preparations and properties
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Beschreibung
Zusammenfassung:	Small zeolite crystals may have a substantial fraction of their active sites located on the crystal exterior. Catalytic characterization of these small crystals in cases where intracrystalline diffusion limitations are significant requires a consideration of the contributions of both the external surface and the intracrystlline active sites. A model accounting for the effectiveness of both types of sites is proposed for first-order reactions.
ISSN:	0888-5885 1520-5045
DOI:	10.1021/ie00073a010