%0 Journal Article
%T Nucleation and growth process of sodalite and cancrinite from kaolinite-rich clay under low-temperature hydrothermal conditions
%A Reyes
%A Carlos Alberto R¨ªos
%A Williams
%A Craig
%A Alarc¨®n
%A Oscar Mauricio Castellanos
%J Materials Research
%D 2013
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%R 10.1590/S1516-14392013005000010
%X the synthesis of low-silica zeotypes by hydrothermal transformation of kaolinite-rich clay and the nucleation and growth processes of sodalite and cancrinite in the system na2o-al2o3-sio2-h2o at 100 a¡ãc were investigated. the synthesis products were characterized by x-ray powder diffraction (xrpd), scanning electron microscopy (sem), fourier transform infrared spectroscopy (ft-ir), 29si and 27al magic angle spinning nuclear magnetic resonance (mas-nmr) and thermogravimetric analysis (tga). our data show that the sequence of the transformation of phases is: poorly crystalline aluminosilicate a£¿¡¯ zeolite lta a£¿¡¯ sodalite a£¿¡¯ sodalite + cancrinite a£¿¡¯ cancrinite. synthesized materials appeared stable thermodynamically under the experimental conditions, with zeolite lta (a metastable phase) occurring as a minor phase, compared with the presence of sodalite and cancrinite.
%K synthesis
%K low-silica
%K hydrothermal
%K kaolinite
%K transformation.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-14392013005000010&lng=en&nrm=iso&tlng=en