Abstract In 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.

中文翻译：

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酸活化对层状钛硅酸盐 AM-4 的影响：结构和物理化学性质的微调

摘要 在这项工作中，我们研究了具有边缘共享的板钛矿型 TiO6 链的合成类似矿物 Lintisite 的微孔层状钛硅酸盐 AM-4（阿威罗-曼彻斯特材料编号 4）。我们工作的目的是验证酸活化对 AM-4 特性的影响，用 0.0625–0.25 M HNO3 处理。SEM、XRD、IR 和 DR UV-vis 光谱的物理化学表征结果、77 K 下的氮吸附/解吸结果证明 AM-4 的质地、化学成分、结构和物理化学性质可以通过用 0.0625 处理来调整–0.25 M HNO3。根据质量滴定法，AM-4的表面酸度（pHPZC）随着HNO3浓度的增加而升高，这与1的反应速率和收率的增加一致，