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We demonstrate a synthesis method to broaden the range of SiO2/Al2O3 ratio (30–100) of high-silica MCM-22 zeolites by prolonging the aging time of the gel before the crystallization. The synthesis conditions such as silica sources, chemical compositions of initial gel and aging time of gel were investigated in detail. High quality MCM-22 products with various morphologies have been synthesized by...
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