Journal of Materials Science, Vol.44, No.12, 3211-3217, 2009
In situ preparation of self-bonded zeolite MCM-22 bodies by vapor-phase transport method
Self-bonded bodies of zeolite MCM-22 were prepared by vapor-phase transport method. The resultant materials were characterized by means of X-ray diffraction, scanning electron microscope, mercury porosimetry, and nitrogen porosimetry. Self-bonded MCM-22 bodies were in situ prepared at pH 10.0 with the molar composition of 0.05Na(2)O:SiO2:0.033Al(2)O(3). It was found that the bodies, prepared by aluminosilicate gel, had been transformed into zeolite MCM-22. The MCM-22 bodies of which the mechanical resistance was 126 N/cm avoided binder accession. By adding auxiliary chemical-PEG20000 to the aluminosilicate gel, the pore size distributions of MCM-22 bodies could be adjusted. The average pore radius of MCM-22 bodies reached in the 149.41-653.64 nm range when AC/SiO2 ratio was 1.5 x 10(-4)-9.0 x 10(-4).