In situ preparation of self-bonded zeolite MCM-22 bodies by vapor-phase transport method
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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 0.05Na2O:SiO2:0.033Al2O3. 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 × 10−4–9.0 × 10−4.
KeywordsZeolite Pore Size Distribution Relative Crystallinity Zeolite Particle Beijing Chemical Reagent
The authors gratefully acknowledge the financial assistance from the National Natural Science Foundation of China (Nos. 20676011 and 20625621).
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