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• W2010707789 abstract "Aqueous solutions of ammonium metavanadate of increasing concentrations have been contacted with a β zeolite before (sample Alβ, Si/Al=11) and after (sample Siβ, Si/Al>1000) dealumination in a 13 N HNO3 solution. UV–visible and 51V NMR characterizations of the V-loaded zeolites show that mainly octahedral V species are formed in Alβ whereas, up to a loading of 1.75 V atoms per unit cell (2.3 V wt.%), only pseudotetrahedral V species (nonhydroxylated (SiO)3VO and hydroxylated (SiO)2(HO)VO) are observed in Siβ. XRD and FT-IR results indicate that the V atoms present in Siβ are incorporated in the framework in a pseudotetrahedral environment. These V species are resistant to washing either with water or with an aqueous solution of NH4OAc (1 mol l−1, 12 h). In contrast, the octahedral V species present in VAlβ (whatever the V loading) and in VSiβ (at loadings higher than 1.75 V per unit cell) are eliminated upon washing showing that these species are loosely bound to the zeolite. As demonstrated by FT-IR, the incorporation of V in the Siβ framework involves silanol groups formed upon dealumination. This incorporation generates new Brönsted acidic sites. New FT-IR bands (3650, 3620, 980, 950 cm−1) are formed whose attribution is proposed. The maximum amount of V atoms incorporated in Siβ (1.75 per unit cell) is lower than the potential amount of framework vacant T-sites generated by dealuminating the β framework (5.3 per unit cell). However, this V amount is 20 times larger than that usually found in V-loaded zeolite prepared by hydrothermal synthesis. Therefore, this study confirms that dealuminating a zeolite is an attractive method to generate silanol groups which can be used to react with vanadium complexes and allow the incorporation in the zeolitic walls of high amounts of V atoms resistant to washing treatments." @default.
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• W2010707789 date "2000-04-01" @default.
• W2010707789 modified "2023-09-25" @default.
• W2010707789 title "Role of silanol groups in the incorporation of V in β zeolite" @default.
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• W2010707789 doi "https://doi.org/10.1016/s1381-1169(99)00332-5" @default.
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