By Eike Brunner, Harry Pfeifer (auth.)
This is the 1st guide on zeolites and different microporous fabrics. it's an up to date, hugely refined choice of details when you take care of zeolites in or at educational associations in addition to being a advisor for newcomers.
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4 Other Molecular Sieves . . . . . Aluminophosphates (VPI, AlPO4 ) . . Silicoaluminophosphates (SAPOs) . . Metal Aluminophosphates (MeAPOs) . Mesoporous Materials (such as MCM-41) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 130 132 134 136 13 Relationship to Catalytic Activity .
130 130 132 134 136 13 Relationship to Catalytic Activity . . . . . . . . . . . . 138 14 Conclusion . . . . . . . . . . . . . . . . . . 141 References . . . . . . . . . . . . . . . . . . . . 142 11 Tuning the Acidity . . . 1 Isomorphous Substitution . 1 Trivalent T Atoms . . . 2 Tetravalent T Atoms . . . 2 Chemical Modification . . 4 Additives . . . . . . . . . . .
5 ppm [119], which is ascribed to H2 O molecules adsorbed on Lewis acid sites. (iii) H2 O molecules can also exist in the physisorbed state (see above). At room temperature, H2 O molecules in the different adsorption states exchange rapidly, which makes the interpretation of the spectra difficult. On the other hand, 1 H MAS NMR spectroscopic studies of these exchange processes allow indirect measurement of the concentration of hydroxonium ions [119]. Fraissard et al. [114–116, 120] have developed another method for the determination of the concentration of hydroxonium ions.