Physicochemical approach to the studies of metal alkoxides

Turova, Nataliya; Turevskaya, E. P.; Yanovskaya, M. I.; Yanovsky, A.I.; Kessler, Vadim G.; Tcheboukov, D.E.

doi:10.1016/s0277-5387(97)00256-8

Cited by 107 publications

(132 citation statements)

References 58 publications

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“…This difference can be associated to some small changes in the sol-gel transition caused by the addition of an acid zinc precursor. Usually, the addition of acid during a sol-gel process accelerates the hydrolysis of the alkoxide, changing the subsequent polymerization, which can affect the final crystallization of the titanium oxide [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

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Ag-Coated Heterostructures of ZnO-TiO2/Delaminated Montmorillonite as Solar Photocatalysts

et al. 2017

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Heterostructures based on ZnO-TiO2/delaminated montmorillonite coated with Ag have been prepared by sol–gel and photoreduction procedures, varying the Ag and ZnO contents. They have been thoroughly characterized by XRD, WDXRF, UV–Vis, and XPS spectroscopies, and N2 adsorption, SEM, and TEM. In all cases, the montmorillonite was effectively delaminated with the formation of TiO2 anatase particles anchored on the clay layer’s surface, yielding porous materials with high surface areas. The structural and textural properties of the heterostructures synthesized were unaffected by the ZnO incorporated. The photoreduction led to solids with Ag nanoparticles decorating the surface. These materials were tested as photocatalysts for the degradation of several emerging contaminants with different nitrogen-bearing chemical structures under solar light. The catalysts yielded high rates of disappearance of the starting pollutants and showed quite stable performance upon successive applications.

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Section: Resultsmentioning

confidence: 99%

“…Cloisite 30B shows a type II isotherm of the UIPAC classification, characteristic of nonporous or macroporous solids [ 30 ]. It presents an H3 hysteresis loop associated to the nonrigid aggregates of plate-like particles (e.g., clay materials) [ 29 ]. The 1C2T heterostructure has been included as a reference.…”

Section: Resultsmentioning

confidence: 99%

Ag-Coated Heterostructures of ZnO-TiO2/Delaminated Montmorillonite as Solar Photocatalysts

et al. 2017

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“…We demonstrated, via the mass balance, that the reaction on Aerosil-200 silica pretreated at 200°C results exclusively in the formation of dinuclear oxo-bridged complexes regardless of Ti loading (13) The dinuclear Ti complex assembles spontaneously on the silica surface via a non-hydrolytic alkoxide condensation reaction which generates the Ti-O-Ti bridge as well as C 3 H 6 (16). Confirmation of this condensation process was obtained via the exposure to Ti(O'Pr) 4 of a silica fully loaded (i.e., with no unreacted hydroxyl groups) with a mononuclear titanium alkoxide complex.…”

Section: Composition Of the Titanium Sites In The Grafted Catalystmentioning

confidence: 99%

Stoichiometry and Kinetics of Gas Phase Cyclohexene Epoxidation by a Silica-Supported tert-Butylperoxidititanium Complex

Bouh¹,

Hassan²,

Scott³

2002

Catalysis of Organic Reactions

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“…Alternatively, reactions can use metal alkoxide starting materials directly, and proceed via ether elimination, as is the case in the Bradley reaction [36]. The Bradley reaction can present a competing reaction path during the reaction of metal halides with ethers, as metal alkoxides with secondary or tertiary alkyl groups are formed in situ during NHSG processes [37]. Compared to conventional sol-gel processes, NHSG reactions follow a different mechanism, leading to significantly less dependence on the identity of the metal ions (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Novel Materials through Non-Hydrolytic Sol-Gel Processing: Negative Thermal Expansion Oxides and Beyond

Lind

Gates

Pedoussaut³

et al. 2010

Materials

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Low temperature methods have been applied to the synthesis of many advanced materials. Non-hydrolytic sol-gel (NHSG) processes offer an elegant route to stable and metastable phases at low temperatures. Excellent atomic level homogeneity gives access to polymorphs that are difficult or impossible to obtain by other methods. The NHSG approach is most commonly applied to the preparation of metal oxides, but can be easily extended to metal sulfides. Exploration of experimental variables allows control over product stoichiometry and crystal structure. This paper reviews the application of NHSG chemistry to the synthesis of negative thermal expansion oxides and selected metal sulfides.

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Physicochemical approach to the studies of metal alkoxides

Cited by 107 publications

References 58 publications

Ag-Coated Heterostructures of ZnO-TiO2/Delaminated Montmorillonite as Solar Photocatalysts

Ag-Coated Heterostructures of ZnO-TiO2/Delaminated Montmorillonite as Solar Photocatalysts

Stoichiometry and Kinetics of Gas Phase Cyclohexene Epoxidation by a Silica-Supported tert-Butylperoxidititanium Complex

Novel Materials through Non-Hydrolytic Sol-Gel Processing: Negative Thermal Expansion Oxides and Beyond

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