Synthesis and characteristics of Y-zeolite/MCM-48 biporous molecular sieve

Y-zeolite/MCM-48 biporous molecular sieve has been synthesized in the mode of overgrowth of MCM-48 on the surface of pre-added zeolite Y. The as-synthesized sample was characterized by XRD, SEM, TEM, IR and nitrogen sorption methods and the corresponding hydrothermal stability was studied. It is found that the composite material exhibits both properties of mesoporous MCM-48 and microporous Y-zeolite sieves. The DFT pore diameter mainly located at 1.2 and 3.2 nm. In the progress of synthesis, the pre-added NaY acts as a seed material and MCM-48 overgrow on the surface of Y-zeolite. Compared with MCM-48 molecular sieve, this new biporous molecular sieve shows a higher hydrothermal stability, which results in its thicker pore-wall, and stronger acidity.

NaY/MCM-48 composite molecular sieve was successfully synthesized in this article. The composite was characterized and showed both properties of mesoporous MCM-48 and microporous Y-zeolite sieve and the results show that MCM-48 grows on the surface of Y-zeolite during the preparation of the composites. Compared with Si-MCM-48 molecular sieve, the composite material shows a higher hydrothermal stability, which results in the thicker pore-wall of the composite material, and stronger acidity.Figure optionsDownload as PowerPoint slide