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  2. Molecular sieve - Wikipedia

    en.wikipedia.org/wiki/Molecular_sieve

    The diameters of the pores that comprise molecular sieves are similar in size to small molecules. Large molecules cannot enter or be adsorbed, while smaller molecules can.

  3. Zeolite - Wikipedia

    en.wikipedia.org/wiki/Zeolite

    Zeolite exhibited in the Estonian Museum of Natural History. Zeolite is a family of several microporous, crystalline aluminosilicate materials commonly used as commercial adsorbents and catalysts. [1]

  4. Activated alumina - Wikipedia

    en.wikipedia.org/wiki/Activated_alumina

    Activated alumina is used for a wide range of adsorbent and catalyst applications including the adsorption of catalysts in polyethylene production, in hydrogen peroxide production, as a selective adsorbent for many chemicals including arsenic, fluoride, in sulfur removal from fluid streams (Claus Catalyst process).