INAMAT2 - Institute for Advanced Materials and Mathematics
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Browsing INAMAT2 - Institute for Advanced Materials and Mathematics by Subject "1,5-benzodiazepine"
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Publication Open Access Effect of the acid activation on a layered titanosilicate AM-4: the fine-tuning of structural and physicochemical properties(Elsevier, 2020) Timofeeva, Maria N.; Kalashnikova, Galina O.; Shefer, Kristina I.; Mel'gunova, Elena A.; Panchenko, Valentina N.; Nikolaev, Anatoliy I.; Gil Bravo, Antonio; Zientziak; Institute for Advanced Materials and Mathematics - INAMAT2; CienciasIn this work we investigated the microporous layered titanosilicate AM-4 (Aveiro-Manchester material number 4) of a synthetic analogous the mineral Lintisite having edge-shared brookite-type TiO6 chains. The objective of our work was to verify the effects of the acid activation on the AM-4 properties, treated with 0.0625–0.25 M HNO3. The results of the physicochemical characterization by SEM, XRD, IR and DR UV–vis spectroscopy, nitrogen adsorption/desorption at 77 K have provided evidences that texture, chemical composition, structural and physicochemical properties of AM-4 could be adjusted by treatment with 0.0625–0.25 M HNO3. According to the method of mass titration, surface acidity (pHPZC) of AM-4 roses with increasing HNO3 concentration, which was in accord with the increase of the reaction rate and yield of 1,5-benzodiazepine in the reaction of cyclocondansation between 1,2-phenylenediamine and acetone.