Mesoporous composite materials based on acid-activated montmorillonites
Montmorillonite is the main component of bentonite clays, which are natural aluminosilicates. Due to the specific structure of the crystal lattice framework and the developed interfacial surface, montmorillonite clays have excellent adsorption and ion-exchange properties. The areas of application of bentonite clays are expanding due to giving them new properties as a result of various types of activation. One of the most effective types of activation is acid treatment. Acid-activated montmorillonites are used as acid catalysts for various reactions. In addition, recently in the world there has been growing interest in the use of natural minerals and composites based on them as supports for catalysts and dehumidifiers. In this regard, the development of composite materials based on acid-activated montmorillonites with improved texture and strength characteristics is very relevant. Acid activation of calcium and sodium montmorillonites from the Taganskoe deposit was performed with HCl solution. It was shown that the development of the porous structure occurs due to the removal of both interlayer cations (Na+, Ca2+) and cations of the octahedral layer (Al3+, Fe3+, Mg2+) during the acid treatment. The texture characteristics and strength properties of extruded composites based on acid-activated montmorillonites are investigated. The nature of the change in the specific surface, pore volume, pore volume distribution and strength of the samples with varying montmorillonite content is analyzed. It was found that composite materials containing 80 wt.% bentonites have a highly developed monodisperse porous structure in the pore size range of 1.8 nm and a specific surface area of 290-330 m2/g. The strength of the composites reaches 100-115 kg/cm2, which is sufficient for industrial supports.
Keywords
монтмориллонит,
кислотная активация,
композитные материалы,
мезопоры,
прочность,
montmorillonite,
acid activation,
composite materials,
mesopores,
strengthAuthors
| Karpova Tatiana R. | Institute of Catalysis SB RAS | ktr@ihcp.ru |
| Buluchevskiy Evgeniy A. | Institute of Catalysis SB RAS | bulu@ihcp.ru |
| Lavrenov Alexander V. | Institute of Catalysis SB RAS | lavr@ihcp.ru |
Всего: 3
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