Reaction Kinetics and Catalysis Letters

, Volume 54, Issue 1, pp 87–97 | Cite as

Catalytic properties of pillared montmorillonites

  • Jozef Krajčovič
  • Pavel Hudec
  • František Grejták


Hydroxyaluminium and hydroxychromium pillared montmorillonites were prepared by intercalation and subsequent calcination of Ca-montmorillonite separated from Jelšový Potok bentonite (Central Slovakia). Ca-montmorillonite and pillared clays were studied by thermal and X-ray diffraction methods. Nitrogen adsorption-absorption data were used to determine pore size distribution, specific surface area, volume of micropores and surface of mesopores. Isomerization of o-xylene to p- and m-xylene, and o-xylene disproportionation were used to test the catalytic activity of investigated materials. The measurements showed increasing catalytic activity in the order Ca-montmorillonite<chromium pillared montmorillonite<aluminium pillared montmorillonite. The results confirmed that increasing surface area had a positive effect on the conversion and disproportionation of o-xylene.


Clay Catalytic Activity Calcination Montmorillonite Pore Size Distribution 
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Copyright information

© Akadémiai Kiadó 1995

Authors and Affiliations

  • Jozef Krajčovič
    • 1
  • Pavel Hudec
    • 2
  • František Grejták
  1. 1.Institute of Inorganic ChemistrySlovak Academy of SciencesBratislavaSlovak Republic
  2. 2.Department of Petroleum, Faculty of Chemical TechnologySlovak Technical UniversityBratislavaSlovak Republic

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