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Zeolite hydrogen-bonded

Figure 2.1.43 C7stal packing of59 (P-1) [87] (a) along [100] but slightly rotated around Y (b) along [-201] irregulartwo-chamber and elliptical channel systems interpenetrate in this organic zeolite hydrogen bonds are indicated. Figure 2.1.43 C7stal packing of59 (P-1) [87] (a) along [100] but slightly rotated around Y (b) along [-201] irregulartwo-chamber and elliptical channel systems interpenetrate in this organic zeolite hydrogen bonds are indicated.
Kim, Y., Lee, B. I., and Yoon, M., Excited-state intramolecular charge transfer of p-NdV-dimethy-laminobenzoic acid in Y zeolites hydrogen bonding effects, Chem. Phys. Lett., 286,466,1988. [Pg.1387]

Scheme 21 Hydrogen bonding effects 3.1.9 Photooxygenation in Zeolites... Scheme 21 Hydrogen bonding effects 3.1.9 Photooxygenation in Zeolites...
Water adsorption on high silica zeolites. Formation of hydroxonium ions and hydrogen-bonded adducts... [Pg.69]

Fig. 4 Proposed defect cluster model in as-made zeolites with quaternary ammonium cations as structure directing agents (SDAs) hydrogen bond distances of 1.68 A are determined experimentally from the H NMR chemical shift of 10.2 ppm X and Y are atoms not further specified in the SDA the interaction between the SDA and the SiO- group is assumed based on bond valence arguments (see text)... Fig. 4 Proposed defect cluster model in as-made zeolites with quaternary ammonium cations as structure directing agents (SDAs) hydrogen bond distances of 1.68 A are determined experimentally from the H NMR chemical shift of 10.2 ppm X and Y are atoms not further specified in the SDA the interaction between the SDA and the SiO- group is assumed based on bond valence arguments (see text)...
As mentioned above, an acidic zeolite can provide both protonic (Bronsted) and aprotonic (Lewis) sites. The Bronsted sites are typically structural or surface hydroxyl groups and the Lewis sites can be charge compensating cations or arise from extra-framework aluminum atoms. A basic (proton acceptor) molecule B will react with surface hydroxyl groups (OH ) via hydrogen bonding... [Pg.124]

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