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The role of boric acid in the synthesis of Eni Carbon Silicates

By Stefano Zanardi, Giuseppe Bellussi, Wallace O'Neil Parker Jr., Erica Montanari, Michela Bellettato, Giuseppe Cruciani, Angela Carati, Stefania Guidetti, Caterina Rizzo and Roberto Millini


The influence of H3BO3 on the crystallization of hybrid organic–inorganic aluminosilicates denoted as Eni Carbon Silicates (ECS's) was investigated. Syntheses were carried out at 100 °C under different experimental conditions, using bridged silsesquioxanes of general formula (EtO)3Si–R–Si(OEt)3 (R = –C6H4– (BTEB), –C10H6– (BTEN) and –C6H4–C6H4– (BTEBP)), in the presence of equimolar concentrations of NaAlO2 and H3BO3. The study, involving the synthesis of three different but structurally related phases (ECS-14 from BTEB, ECS-13 here described for the first time from BTEN, and ECS-5 from BTEBP), confirmed a catalytic role for H3BO3 which in general increased the crystallization rate and improved the product quality in terms of amount of crystallized phase (crystallinity), size of the crystallites and phase purity, while it was weakly incorporated in trace amounts in the framework of ECS's

Topics: Boric acid, Bridged silsesquioxanes, Catalytic role, Hybrid organic-inorganic
Year: 2014
DOI identifier: 10.1039/c4dt00919c
OAI identifier: oai:iris.unife.it:11392/2182413
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