Eike Brunner, Harry Pfeifer (auth.)'s Acidity and Basicity PDF

By Eike Brunner, Harry Pfeifer (auth.)

ISBN-10: 3540739637

ISBN-13: 9783540739630

This is the 1st instruction manual on zeolites and different microporous fabrics. it truly is an updated, hugely refined selection of info if you happen to take care of zeolites in or at educational associations in addition to being a advisor for newcomers.

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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. 4). In the experiments to be described in this section, the NMR spectra exhibit various lines so that the limiting case of slow exchange can be assumed, at least approximately for the analysis of the spectra.

9 ZSM-5 Zeolites . . . . . . . . . . Influence of the Probe Molecule . . . . . Effect of Adsorption Temperature . . . . Difference in Preparation Procedures . . . Effect of Pretreatment . . . . . . . . Effect of Proton Exchange Level . . . . . Influence of the Si/Al Ratio and Dealumination Metal-Modified ZSM-5 .

15 N CP MAS NMR spectra of adsorbed pyridine have been studied by Maciel et al. [103] (pyridine on silica-alumina), Ripmeester [104] (pyridine on γ -alumina, mordenite), and by Majors and Ellis [159] (pyridine on γ -alumina). Values for the resonance shift relative to solid pyridine are collected in Table 6. The major drawbacks of these experiments are: (i) an absolute determination of concentrations is connected with large errors due to the strong dependence of the line intensities on parameters controlling the efficiency of cross polarization [107] (see Sect.

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


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