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
Synthesis, characterization and selective oxidation properties of Ti-containing mesoporous catalysts
Griselda A. Eimer,Sandra G. Casuscelli,Guillermo E. Ghione,Mónica Elsie Crivello,Eduardo R. Herrero +4 more
TL;DR: In this article, the effects of several factors such as the state and content of Ti, surfactant/Si ratio and template removal technique on the physicochemical properties and catalytic activity of Ti-MCM-41 were investigated.
Book ChapterDOI
Preparation and properties of Ti-containing MCM-41
TL;DR: In this paper, the isomorphous substitution of Si by Ti and/or V into the framework of MFI and MEL zeolite structures leads to materials that show good activity and selectivity for the oxidation of phenol, cycloalkanes, olefins, and alcohols using iodosobenzene and air as oxidants.
Journal ArticleDOI
UV−Visible Diffuse Reflectance Spectroscopy of Zeolite-Hosted Mononuclear Titanium Oxide Species
TL;DR: In this article, the analysis of UV−vis diffuse reflectance spectra was carried out for faujasites of different Si/Al ratios by reaction of dehydrated zeolites with TiCl4 at 100 °C.
Journal ArticleDOI
Titania−Silica Materials from the Molecular Precursor Ti[OSi(OtBu)3]4: Selective Epoxidation Catalysts
TL;DR: In this article, the tristert-butoxy)siloxy complex Ti[OSi(OtBu)3]4 was pyrolytically converted at low temperatures to the theoretical yield of homogeneous TiO4SiO2 materials.
Journal ArticleDOI
Computational and EXAFS Study of the Nature of the Ti(IV) Active Sites in Mesoporous Titanosilicate Catalysts
P. E. Sinclair,Gopinathan Sankar,C. Richard A. Catlow,and John Meurig Thomas,Thomas Maschmeyer +4 more
TL;DR: In this paper, nonlocal density functional theory (DFT) calculations within the cluster approximation have been carried out in order to model the formation of Ti active sites in the pores of mesoporous silicas by the reaction of (η5-C5H5)2TiCl2 with terminal surface silanols.
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.