Print version ISSN 0012-7353
RIOS REYES, CARLOS; DENVER WILLIAMS, CRAIG and ROBERTS, CLIVE. SYNTHESIS AND CHARACTERISATION OF SOD-, CAN- AND JBW-TYPE STRUCTURES BY HYDROTHERMAL REACTION OF KAOLINITE AT 200°C. Dyna rev.fac.nac.minas [online]. 2011, vol.78, n.166, pp. 38-47. ISSN 0012-7353.
Low-silica zeolitic materials like SOD, CAN and JBW crystallized after hydrothermal transformation of kaolinite in the system Na2O-Al2O3-SiO2-H2O at 200°C, 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.
Keywords : Low-silica zeolitic materials; hydrothermal; synthesis; kaolinite; dissolution.