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
Epoxidation Reaction of Unsaturated Hydrocarbons with H2O2 over Defect TS-1 Investigated by ONIOM Method: Formation of Active Sites and Reaction Mechanisms
TL;DR: In this article, the mechanism of alkene oxidation with hydrogen peroxide over the titanium silicalite-1 (TS-1) defect was investigated using a 65T nanocluster, TiSi64O97H74, and calculated at the 9T/65T two-layered ONIOM(B3LYP/6-31G(d,p):UFF) level.
Journal ArticleDOI
On the origin of the band at 960 cm−1 in the vibrational spectra of Ti-substituted zeolites
TL;DR: In this article, a new band at 935 cm −1 appears in the calculated infrared and Raman spectra upon incorporation into the lattice of a Ti-substituted orthorhombic MFI.
Journal ArticleDOI
Synthesis, characterization of bimetallic Ce-Fe-SBA-15 and its catalytic performance in the phenol hydroxylation
TL;DR: A series of Ce and Fe incorporated SBA-15 mesoporous materials were synthesized through direct hydrothermal method and characterized by using inductively coupling plasma atomic emission spectrometry (ICP-AES), powder X-ray diffraction (XRD), thermo gravimetry and differential scanning calorimetry (TG/DSC), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible diffuse reflectance spectra (UV-vis) and N2 adsorption-desorption isother
Journal ArticleDOI
Synthesis of tin(IV) silicalites (MFI) and their characterization: A Mössbauer and MAS NMR spectroscopy study
TL;DR: In this article, the synthesis of tin(IV) (iron, chromium, gallium, indium and titanium) silicalites and their characterization by SEM, X-ray diffraction, FTIR, Mossbauer and MAS NMR spectroscopies are reported.
Journal ArticleDOI
Enhanced Catalytic Performance of Titanium Silicalite-1 in Tuning the Crystal Size in the Range 1200–200 nm in a Tetrapropylammonium Bromide System
TL;DR: In this article, a facile method for the size-controllable synthesis of titanium silicalite-1 (TS•1) was presented, where a tetrapropylammonium bromide hydrothermal system was used, and the amount of seeds (silicalite‐1 suspension) and crystallization time were tuned to control the crystal size.
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.