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• W2976793929 abstract "Abstract To clarify the issue on Brønsted acidity enhancement by the presence of zinc species in H‐ZSM‐5 zeolite (G.D. Qi, et al., Angew. Chem.‐Int. Edit . 2016 , 55 , 15826), the influence of Zn 2+ cationic species, introduced into the zeolite, on the strength of Brønsted acid sites (BAS) has been analyzed by solid‐state NMR and FTIR techniques using trimethylphosphine (TMP) and CO as probe molecules. Comparative analysis of the acidity for H‐ZSM‐5 and Zn 2+ /H‐ZSM‐5 zeolites has been performed. TMP adsorbed on both zeolite samples exhibits same signals at 6.3 and −4.5 ppm in 1 H and 31 P MAS NMR spectra, respectively, assigned to protonated TMP. FTIR spectroscopy has shown that both zeolite samples, H‐ZSM‐5 and Zn 2+ /H‐ZSM‐5, display the same red frequency shift (Δν OH⋅⋅⋅CO =−318 cm −1 ) of the O−H stretching band and the same blue frequency shift (Δν CO =+32 cm −1 ) of the CO stretching band for CO adsorption complex with BAS. The results obtained do not provide any evidence for the existence of some specific BAS with enhanced acid strength for Zn 2+ ‐exchanged zeolite compared to the strength inherent to pure acid‐form zeolite. It is thus inferred the strength of BAS in H‐ZSM‐5 zeolite is not affected by the modification of the zeolite with Zn 2+ cationic species." @default.
• W2976793929 created "2019-10-03" @default.
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• W2976793929 date "2019-10-31" @default.
• W2976793929 modified "2023-10-18" @default.
• W2976793929 title "Does the Zn²⁺ Species Introduced into H‐ZSM‐5 Zeolite Affect the Strength of Brønsted Acid Sites?" @default.
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• W2976793929 doi "https://doi.org/10.1002/cctc.201901637" @default.
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