• Preparation, characterization, and post-synthetic modification of layered MCM-22 zeolite precursor

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    • Keywords

       

      Colloidal silica; silicic acid; MCM-22(P); swelling-sonication; alkali-treatment.

    • Abstract

       

      Hydrothermal synthesis of MCM-22(P) was carried out with two different silica sources, colloidal silica (28%) and silicic acid with different gel composition. The synthesis was carried out in stirring and static conditions with different crystallization time. MCM-22(P) modified with swelling-sonication method resultedin swollen MCM-22, while alkali treatment yielded desilicated MCM-22. The materials were characterized by X-ray diffraction, low-angle XRD, FE-SEM-EDX, FT-IR, TGA, N₂ adsorption and NH₃-TPD analysis. The results revealed that MCM-22 has a layered sphere, doughnut like morphology and after modification, swollen and broken sphere was observed. Physicochemical analysis revealed that the materials’ mesoporosity increased and acidity also changed. Energy dispersive X-ray analysis revealed the high amount of desilicationin alkali-treated MCM-22(P).

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