Synthesis and Investigation of Zeolite TiO 2 /Al-ZSM-12 Structure and Properties.

The textural, structural, morphological, and acidic properties of TiO₂/Al-ZSM-12 zeolite synthesized viathe hydrothermal method and using methyltriethylammonium chloride as a template were studied in this study. The structure, size, and shape of the crystallites, and the acidity of the synthesized materials were investigated in detail using the following methods: XRD, low-temperature nitrogen adsorption–desorption, XRF, FTIR, Raman spectroscopy, DRS UV–Vis, DRIFTS, PL, SEM, TEM, solid-state NMR spectroscopy on ²⁷Al, ¹H, ²⁹Si, ¹H-²⁹Si and ²³Na nuclei, NH₃-TPD, TG, DSC, DTA, FTIR-Py, FTIR-2,6-dTBP, FTIR-CD₃CN, and DRIFTS-acid. The presence of tetrahedral titanium in the TiO₂/Al-ZSM-12 zeolite was confirmed by Raman spectroscopy, DRIFT, and ²⁹Si NMR. It was revealed that the crystallites of the TiO₂/Al-ZSM-12 zeolite, elongated along the b axis, had a higher acidity compared to the unsubstituted zeolite Al-ZSM-12. The oxidative catalytic activity of the TiO₂/Al-ZSM-12 zeolite was studied in the photoinduced decomposition of the crystal violet dye and it was found that the reaction proceeds most efficiently in the presence of H₂O₂ as an oxidizing agent and TiO₂/Al-ZSM-12 as a catalyst (PCA = 0.157%∙min⁻¹). [ABSTRACT FROM AUTHOR]