By Günter Engelhardt, Hubert Koller (auth.), Prof. Dr. Bernhard Blümich (eds.)

ISBN-10: 3642500498

ISBN-13: 9783642500497

ISBN-10: 364250051X

ISBN-13: 9783642500510

1. G. Engelhardt, H. Koller, Stuttgart, FRG: 29Si NMR of Inorganic Solids 2. H. Pfeifer, Leizpig, FRG: NMR of good Surfaces three. A. Sebald, Bayreuth, FRG: MAS and CP/MAS NMR of much less universal Spin-1/2 Nuclei four. C. J{ger, Mainz, FRG: satellite tv for pc Transition Spectroscopy of Quadrupolar Nuclei five. D. Brinkmann, M. Mali, Z}rich, CH: NMR-NQR stories of High-Temperature Superconductors

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Additional info for Solid-State NMR II: Inorganic Matter

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Catalysis based on zeolite Y containing bridging OH groups have a cracking activity which is orders of magnitude greater than that of the formerly used silica-alumina catalysts. The synthetic zeolite ZSM-S is very useful for many applications since its high silicon content (n ~ IS) gives it high thermal stability, while the channel diameters lead to quite striking effects of shape selectivity including the ability to synthesize gasoline from methanol (MTG = methanol-to-gasoline process). Summarized, zeolites share the following five properties: (1) Well-defined crystalline structure, (2) large internal surface areas since 4 x 10 20 supercageslg with ca.

Of composition Na 2Si 20 s ·nH 20 [112J or Na 2Si 4 0 9·nH 20 [97J owing to overlapping lines of several Qn environments present in the glass structure. However, type and relative proportions of the distinct Qn coordinations could be determined by careful interpretation of the overlapping resonances and subsequent line deconvolution. A detailed Qn speciation of the glasses could thus be given which shows clearly the increasing depolymerisation of the glass network with increasing water content.

4 x 10- 9 m 3/kg and does not depend on the temperature T or on the intensity Bo of the applied magnetic field. 6 x 10 - 12 m 3/mol for Si0 2 [28J which corresponds (cf. Eq. 49 x 1O- 9 m 3/kg. In contrast, for the commercial zeolite containing ca. 2 x 1O- 9 m 3/kg if the temperature decreases from about 550 K to 170 K. 5 T. For the usual form of the NMR samples, viz. cylindrical tubes oriented perpendicular to the magnetic field Bo with a value of about 3 for the ratio between the filling height and the diameter of the the sample, the demagnetization factor a is ca.

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Solid-State NMR II: Inorganic Matter by Günter Engelhardt, Hubert Koller (auth.), Prof. Dr. Bernhard Blümich (eds.)

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