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Effect of the addition of propane and distortion of tetrahedral vanadium(V) species in VSiβ zeolites on the photodecomposition of NO

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VxSiβ catalysts with x = 0.05, 0.2 and 1.75 V wt%, prepared by a two-step post-synthesis method, have been characterised by physical techniques and their photocatalytic reactivity investigated in the decomposition of NO. XRD and diffuse reflectance UV–Vis spectroscopy show that vanadium is incorporated as tetrahedral VV species, a result confirmed by XANES and EXAFS. Photoluminescence spectra of VxSiβ catalysts show well-resolved vibrational fine structures due to three different kinds of tetrahedral VV (α, β, γ) species, with different degrees of distortion. Their relative amounts depend on V content and calcination/hydration treatments. Calcined–hydrated V1.75Siβ, calcined V1.75Siβ and calcined V0.05Siβ exhibit mainly the α, γ and β kind of tetrahedral vanadium, respectively. These samples are active in the decomposition of NO under UV-irradiation, leading mainly to N2 and O2. The decomposition of NO is strongly enhanced in presence of propane, leading to higher yield of N2. The latter strongly depends on the distortion of tetrahedral V species. The highest activity is found for the catalyst with tetrahedral V of highest distortion, lowest V=O bond length and biggest lifetime of its excited triplet state.


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