Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV-Vis Spectroscopies - Sorbonne Université Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2014

Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV-Vis Spectroscopies

Abstract

A MoSiBEA zeolite has been prepared by a two-step postsynthesis procedure that consists of first creating the vacant T-atom sites with associated silanol groups by treatment of TEABEA zeolite with nitric acid and then incorporating Mo ions into the vacant T-atom sites by solid-state ion exchange at 773 K using molybdenum(II) acetate. The incorporation of Mo ions into the vacant T-atom sites of the framework of SiBEA zeolite as isolated mononuclear Mo(VI) species was evidenced by the combined use of XRD and FTIR, NMR, and diffuse reflectance UV-visible spectroscopies. The consumption of OH groups was monitored by FTIR spectroscopy. The reducibility of Mo was investigated by TPR and EPR spectroscopy. The size of very small well-dispersed Mo(0) nanoparticles formed upon treatment of MoSiBEA between 298 and 1240 K in hydrogen stream (5% H2/Ar) was measured by TEM.
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Dates and versions

hal-00983714 , version 1 (25-04-2014)

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Rafal Baran, Frédéric Averseng, Yannick Millot, Thomas Onfroy, Sandra Casale, et al.. Incorporation of Mo into the Vacant T-Atom Sites of the Framework of BEA Zeolite as Mononuclear Mo Evidenced by XRD and FTIR, NMR, EPR, and DR UV-Vis Spectroscopies. Journal of Physical Chemistry C, 2014, 118, pp.4143-4150. ⟨10.1021/jp410016g⟩. ⟨hal-00983714⟩
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