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

By Eike Brunner, Harry Pfeifer (auth.)

This is the 1st instruction manual on zeolites and different microporous fabrics. it truly is an up to date, hugely subtle selection of details if you take care of zeolites in or at educational associations in addition to being a consultant for newcomers.

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182]. It is, furthermore, remarkable that the 17 O NMR chemical shift is sensitive to the Si – O – Al bond angle [181]. Another NMR spectroscopic method for the determination of basicity in zeolites was suggested by Bosácek [183]. This method is based on measurement of the 13 C NMR chemical shift of surface methyl groups. Surface methyl groups can be formed on framework oxygen atoms, here denoted by O– according to the reaction: CH3 I + O– Me+ → O – CH3 + MeI (44) if CH3 I is adsorbed on a zeolite containing charge compensating cations Me+ .

E. the hydrogen bond distance cannot be used as a measure of the strength of acidity of bridging hydroxyl groups. If the NMR spectrum consists of two or more superimposed signals, it may be advantageous to apply the MAS technique in order to resolve the different signals (see above). g. internuclear distances, may then be obtained by a numerical analysis of the spinning sideband pattern [70]. In contrast to the above-described example (CO on bridging hydroxyl groups), the NMR signals of nuclei in adsorption complexes may exhibit complicated line shapes due to the superposition of various magnetic interactions.

Influence of Occluded Clusters . . . . . . Influence of Dealumination on H-Y Zeolites . . Acidity in Fluid Cracking Catalysts (FCCs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ZSM-5 Zeolites . . . . . . . . . . Influence of the Probe Molecule . . . . . Effect of Adsorption Temperature . . . .

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