Timofeeva, Maria N.Kalashnikova, Galina O.Shefer, Kristina I.Mel'gunova, Elena A.Panchenko, Valentina N.Nikolaev, Anatoliy I.Gil Bravo, Antonio2020-05-262022-03-0120200169-131710.1016/j.clay.2020.105445https://academica-e.unavarra.es/handle/2454/36984In 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.31 p.application/pdfeng© 2020 Elsevier B.V. This manuscript version is made available under the CC-BY-NC-ND 4.0Layered titanosilicate AM-4Acid treatment1,5-benzodiazepine1,2-phenylenediamineCyclocondensation reactioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess