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<p>This study explores the alkaline treatment of Philippine natural zeolite (PNZ) using different NaOH concentrations to synthesize MFI-type zeolites for VOC removal. NaOH concentration significantly altered PNZ’s composition and morphology. Untreated PNZ’s irregular structure changed into spherical particles at 1.5–3&#xa0;M NaOH, while 5&#xa0;M (AT5) treatment formed crystalline aggregates. XRF confirmed 20% desilication, suggesting mesopore formation. AT5-produced MFI-type zeolite had spherical agglomerates (7.8 ± 0.2&#xa0;µm) and nanoplates (0.4 ± 0.08&#xa0;µm). XRD showed AT5 had pure MFI peaks, while untreated PNZ contained Beta and Mordenite impurities. Crystallinity showed that MFI-R has a crystallinity of 64.68%, while MFI-AT exhibits a higher value of 73.85%. This suggests that MFI-AT possesses a more well-ordered, crystalline structure compared to MFI-R, which contains a greater proportion of disordered or amorphous regions.</p> Graphical abstract <p></p>

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Synthesis of MFI-type framework from Philippine natural zeolite: Effects of alkaline treatment on zeolite morphology and structure and its impact on MFI-type framework formation

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Don Nelson C. Potato,
  • Hannah Shamina O. Cosiñero,
  • Apraile Hope P. Dumrigue,
  • Ramuel John I. Tamargo

摘要

This study explores the alkaline treatment of Philippine natural zeolite (PNZ) using different NaOH concentrations to synthesize MFI-type zeolites for VOC removal. NaOH concentration significantly altered PNZ’s composition and morphology. Untreated PNZ’s irregular structure changed into spherical particles at 1.5–3 M NaOH, while 5 M (AT5) treatment formed crystalline aggregates. XRF confirmed 20% desilication, suggesting mesopore formation. AT5-produced MFI-type zeolite had spherical agglomerates (7.8 ± 0.2 µm) and nanoplates (0.4 ± 0.08 µm). XRD showed AT5 had pure MFI peaks, while untreated PNZ contained Beta and Mordenite impurities. Crystallinity showed that MFI-R has a crystallinity of 64.68%, while MFI-AT exhibits a higher value of 73.85%. This suggests that MFI-AT possesses a more well-ordered, crystalline structure compared to MFI-R, which contains a greater proportion of disordered or amorphous regions.

Graphical abstract