Publicado

2011-03-01

SYNTHESIS AND CHARACTERISATION OF SOD-, CAN-AND JBW-TYPE STRUCTURES BY HYDROTHERMAL REACTION OF KAOLINITE AT 200OC

Palabras clave:

Low-silica zeolitic materials, hydrothermal, synthesis, kaolinite, dissolution (es)

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Autores/as

  • CARLOS RIOS REYES Profesor Titular, Escuela de Geología, Universidad Industrial de Santander, Bucaramanga, Colombia
  • CRAIG DENVER WILLIAMS School of Applied Sciences, University of Wolverhampton,England
  • CLIVE ROBERTS School of Applied Sciences, University of Wolverhamptont, Wolverhampton WV1 1SB, England
Low-silica zeolitic materials like SOD, CAN and JBW crystallized after hydrothermal transformation of kaolinite in the system Na₂O–Al₂O₃–SiO₂–H₂O at 200oC, with or without the addition of a structure-directing agent. The synthesis products were characterized by XRD, SEM, FTIR, ²⁹Si and ²⁷Al MAS-NMR and TGA. After dissolution of kaolinite in alkaline medium, co-crystallization of SOD and CAN, likely via a metastable LTA intermediate, was followed by a transformation to JBW-type structure.