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 resulted in 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, \(\hbox {N}_{2}\) adsorption and \(\hbox {NH}_{3}\)-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 desilication in alkali-treated MCM-22(P).
Graphical Abstract
SYNOPSIS Hydrothermal synthesis of layered MCM-22 using two different silica sources under stirring and static condition is reported. Layered zeolite MCM-22 synthesized from colloidal silica under stirring conditions was modified with swelling-sonication and alkali-treatment methods respectively. Crystal structure of MCM-22 remain unchanged while morphology was different when synthesized using different silica sources.
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Acknowledgements
Council of Scientific and Industrial Research (CSIR)—National Chemical Laboratory (NCL), Pune, provided great support to do instrumental analysis and explore our ideas for research applications. Riddhi Thakkar acknowledges DST, India, for a research fellowship (Inspire fellowship). The authors would also like to thank Dr. Satyanarayana Chilukuri and his research team for helpful technical discussions.
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Thakkar, R., Bandyopadhyay, R. Preparation, characterization, and post-synthetic modification of layered MCM-22 zeolite precursor. J Chem Sci 129, 1671–1676 (2017). https://doi.org/10.1007/s12039-017-1366-3
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DOI: https://doi.org/10.1007/s12039-017-1366-3