Immobilization of (n-Bu4N)4W10O32 on Mesoporous MCM-41 and Amorphous Silicas for Photocatalytic Oxidation of Cycloalkanes with Molecular Oxygen

Heterogeneous Photooxidation of Alcohols in Water by Photocatalytic Membranes Incorporating Decatungstate

“…[31] These aspects will be addressed by studying the effect of the membrane loading on reaction rates (vide infra).…”

“…[28,29] This approach has been recently addressed experimentally by immobilising a lipophilic decatungstate salt, (n-Bu 4 N) 4 W 10 O 32 , on amorphous silica or a mesoporous MCM-41 type and performing the heterogeneous photooxidation in an organic dispersing medium. [28,30,31] In the present work, we focused on aqueous photocatalysis. In water, the choice of an appropriate hydrophobic support is crucial to induce the sorption of an organic substrate in close proximity to the active site, and may be the key to discriminate among reactants based on their hydrophobic properties and affinity towards the heterogeneous catalyst so as to favour the selectivity tuning.…”

Semiconductors in Organic Photosynthesis

“…(n-Bu 4 N) 4 W 10 O 32 (TBADT), supported on silica by impregnation procedure, was successfully employed at room temperature and atmospheric pressure to promote by irradiation ( > 300 nm) the aerobic oxidation of cyclohexane to a 1:1 mixture of cyclohexanol and cyclohexanone (Molinari et al, 1999), while under analogous conditions cyclohexene was converted to the corresponding cyclohexenyl hydroperoxide with 90 % of selectivity . This decatungstate was also immobilized on a mesoporous MCM-41-type material, which allows to obtain a better dispersion of the semiconductor, and the new material was tested in the oxidation of the cyclohexane for comparison with the silica supported material (Maldotti et al, 2002b). These studies showed the key role of the solid matrix in controlling the ketone/alcohol ratio of the products.…”

A New Generation of Catalytic Poly(vinylidene fluoride) Membranes: Coupling Plasma Treatment with Chemical Immobilization of Tungsten‐Based Catalysts

“…[28] W10 has been widely used for the photocatalytic oxidation of organic molecules and for the degradation of organic pollutants such as phenol and its derivatives, which are among the most significant toxic pollutants in wastewater. [29] Phenols are included in several priority lists of pollutants; consequently, the development of new effective methods for their degradation, such as advanced oxidation processes, is highly desirable. These methods, mainly based on the photoinduced generation of OH radicals, lead to mineralization of organic pollutants.…”