Characterization I: -/- by Helmut G. Karge, Ekkehard Geidel (auth.), Hellmut G. Karge,

By Helmut G. Karge, Ekkehard Geidel (auth.), Hellmut G. Karge, Jens Weitkamp (eds.)

Molecular Sieves - technology and Technology covers, in a entire demeanour, the technological know-how and know-how of zeolites and all comparable microporous and mesoporous fabrics. Authored by way of well known specialists, the contributions are grouped jointly topically in the sort of approach that every quantity of the booklet sequence offers with a particular sub-field. Volume 4 covers the characterization of molecular sieves with the aid of crucial spectroscopic strategies (Characterization I), i.e. IR, Raman, NMR, EPR, UV-VIS Spectroscopy, X-ray absorption, photoelectron and Mössbauer Spectroscopy. thought, scan and alertness in chosen examples are discussed.

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4 Experimental Techniques In this section, experimental techniques for the characterization of zeolites and adsorbate/zeolite samples via IR spectroscopy, Raman scattering and inelastic neutron scattering will be briefly discussed. For more detailed information, the reader is referred to Refs. [145–150]. 1 Transmission IR Spectroscopy IR radiation energy transmitted through a zeolite sample is measured by infrared spectrometers as a function of the wavenumber, n˜, (in cm–1) or wavelength, l (in mm), where n˜ = 104/l and n˜ =c0 n, with c0 representing the velocity of light.

4 Fourier Transform Infrared Emission Spectroscopy (FT-IRES) In an interesting article by Sullivan et al. [182], different IR spectroscopic techniques (except photoacoustic IR spectroscopy) were compared (cf. Table 3). There was also described and discussed the relatively new Fourier transform infrared emission spectroscopy (IRES), its principle, an appropriate FT-IRES setup and applications. FT-IRES is unique in that it does not require an external radiation source, because the sample itself is the source.

4. Kinetic energy distribution of oxygen atoms (a), aluminum atoms (b), silicon atoms (c), and sodium atoms (d) [24]. Reproduced with permission of the Royal Society of Chemistry ing and bending modes is a rather crude approximation for structures containing cyclic subunits in which both types of internal coordinates are always related to each other. This gives rise to complex couplings within most of the symmetric stretching and bending modes, in particular in the region below 800 cm–1. The second important aim pursued in theoretical investigations of zeolite framework dynamics was to reveal relations between characteristic spectral features and the presence of specific substructures in the lattices.

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