Abstract
Ti x SiBEA zeolites (x = 1.5, 3.2 and 5.8 Ti wt%) are prepared by a two-step postsynthesis method involving (1) dealumination of TEABEA zeolite by nitric acid leading to nests of SiO–H groups in vacant T-atom sites and (2) incorporation of Ti into SiBEA zeolite by reacting TiCl4 vapor with those silanol groups. The incorporation of Ti into the SiBEA framework is evidenced by XRD, 29Si MAS NMR, 1H–29Si CP MAS NMR and 1H MAS NMR. DR UV–vis and XPS investigations show that, for low Ti content, mainly framework tetrahedral Ti(IV) ions are present in Ti x SiBEA zeolites. On the basis of XPS data, the quantification of framework tetrahedral Ti(IV) and framework and/or extra-framework octahedral Ti(IV) ions is followed as a function of Ti content.
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S. Dzwigaj gratefully acknowledges the CNRS (France) for financing his research position.
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Nogier, JP., Millot, Y., Man, P.P. et al. Nature, Environment and Quantification of Titanium Species in TiSiBEA Zeolites Investigated by XRD, NMR, DR UV–Vis and XPS. Catal Lett 130, 588–592 (2009). https://doi.org/10.1007/s10562-009-9960-8
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DOI: https://doi.org/10.1007/s10562-009-9960-8