Book ChapterDOI
Spectroscopic Characterization of Silicalite and Titanium-Silicalite
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In this article, the surface characterization of silicalite and titanium-silicalite is made by combined use of IR and UV-Vis reflectance spectroscopy, and the nature of the IR modes and of the electronic transitions associated with framework titanium is discussed in detail.Abstract:
Surface characterization of silicalite and titanium-silicalite is made by combined use of IR and UV-Vis reflectance spectroscopy. The nature of the IR modes and of the electronic transitions associated with framework titanium is discussed in detail. The perturbation caused by the adsorption of small polar molecules (H 2 O, NH 3 , CH 3 OH) on both the IR and UV-Vis spectra is discussed in terms of the formation of six-coordinated complexes by ligand insertion in the Ti(IV) coordination sphere. All the Ti(IV) is accessible to the interaction with the molecules.read more
Citations
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Journal ArticleDOI
DRS UV-Vis and EPR spectroscopy of hydroperoxo and superoxo complexes in titanium silicalite
TL;DR: In this article, the most important spectroscopic features in the UV-Vis of framework and extra-framework Ti(IV) in titanium silicalite are summarized and the formation of EPR active species is also considered.
Journal ArticleDOI
Preparation and in-Situ Spectroscopic Characterization of Molecularly Dispersed Titanium Oxide on Silica
TL;DR: In this paper, the molecularly dispersed TiO2/SiO2 supported oxides were prepared by the incipient wetness impregnation of 2-propanol solutions of titanium isopropoxide.
Journal ArticleDOI
Probing zeolites by vibrational spectroscopies
Silvia Bordiga,Carlo Lamberti,Carlo Lamberti,Francesca Bonino,Arnaud Travert,Frédéric Thibault-Starzyk +5 more
TL;DR: This review addresses the most relevant aspects of vibrational spectroscopies applied to zeolites and zeotype materials and describes the methods needed to precisely determine the IR absorption coefficients, making IR a quantitative technique.
Journal ArticleDOI
Structural and Physicochemical Features of Titanium Silicalites
TL;DR: In this article, a comparison and discussion of the substantial amount of information about the state and coordination of titanium ions in titanium silicalites is presented, with emphasis on location of the Ti ions in framework or extra-framework positions, their coordination, and the relationship of some spectral features to concrete structures at the atomic level.
Journal ArticleDOI
Recent Progress in Synthesis of Fine and Specialty Chemicals from Wood and Other Biomass by Heterogeneous Catalytic Processes
TL;DR: In this paper, the synthesis of fine and specialty chemicals involving heterogeneous catalysts is discussed according to the type of reactions (e.g., hydrogenation, oxidation, isomerization, etc.) for various biomass derived feedstocks.
References
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Journal ArticleDOI
Silicalite, a new hydrophobic crystalline silica molecular sieve
Edith M. Flanigen,J. M. Bennett,R. W. Grose,J. P. Cohen,R. L. Patton,Richard M. Kirchner,Joseph V. Smith +6 more
TL;DR: In this article, a new polymorph of SiO2 (silicalite, refractive index 1.39, density 1.76 g cm−3) has been proposed, which encloses a three-dimensional system of intersecting channels defined by 10-rings wide enough to adsorb molecules up to 0.6 nm diameter.
Journal ArticleDOI
Zeolites: Catalysts for Organic Syntheses
TL;DR: The characteristic properties of zeolites, such as acidity, shape-selectivity and thermal stability, also enable them to be used for highly selective synthesis in the fields of chemical intermediates and fine chemicals as mentioned in this paper.
Journal ArticleDOI
Identification of ZSM-type and other 5-ring containing zeolites by i.r. spectroscopy
TL;DR: The mid i.r. spectra have been recorded of the pentasil family, of the mordenite group, of ZSM-39 and Melanophlogite as mentioned in this paper.
Book ChapterDOI
Electron Transfer Spectra
TL;DR: In this paper, it was shown that the Laporte-forbidden bands of transition group complexes can be adapted to the strong Laportes-allowed bands, at least in the octahedral complexes of a central ion with six halide ligands.