Download Acidity and Basicity by Eike Brunner, Harry Pfeifer (auth.) PDF

By Eike Brunner, Harry Pfeifer (auth.)

This is the 1st guide on zeolites and different microporous fabrics. it truly is an up to date, hugely subtle number of info in case you care for zeolites in or at educational associations in addition to being a advisor for newcomers.

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Furthermore, Nicholas et al. [129] have suggested investigation of the protonation of typical Hammett indicators by NMR spectroscopy in order to determine the strength of acidity of Brønsted acid sites, which may be a promising technique for future experiments. Finally, Mildner and Freude [130] have studied the proton transfer between Brønsted acid sites in H – Y zeolites and adsorbed benzene molecules via two-dimensional exchange spectroscopy. This exchange can be considered to be the first elementary step of a Brønsted acid-catalysed reaction.

9 Faujasite-Type Zeolites X and Y . . . . . Influence of the Probe Molecule . . . . . Temperature Dependence of Heats of Adsorption Thermal Stability of Faujasites . . . . . . Influence of the Crystallite Size . . . . . . The Effect of Proton Exchange Level . . . . Substitution by Other Cations . . . . . . Influence of Occluded Clusters . . . . . . Influence of Dealumination on H-Y Zeolites . . Acidity in Fluid Cracking Catalysts (FCCs) .

27) In the limiting case of rapid exchange: 2πτ |νa – νb | 1 (28) the lines merge into a single line at the frequency: ν = pa νa + pb νb . e. for: 2πτ |νa – νb | ≈ 1 . (30) Therefore, we shall discuss only experiments where the exchange of the probe molecules among the adsorption sites can be assumed to be slow (Eq. 27) or rapid (Eq. 28). 1 Slow Exchange The complete suppression of the influence of rapid exchange processes upon the spectra may require measurements at very low temperatures, especially for small probe molecules of high mobility (see Sect.

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