Characterization and catalytic behavior of highly active tungsten-doped SBA-15 catalyst in the synthesis of glutaraldehyde using an anhydrous approach

Crystals of hexagonal tungsten oxides (hex-WO3) have been synthesized using hydrothermal method at 150 degrees C, assisted by the capping reagent of ammonium tartrate (AT). The XRD and EDX results reveal that the lattice distortion exists in all the samples, possibly due to the defects and the intercalation of the residual sodium ions. Different crystal shapes including plate-like, urchin-like, and particle structures were obtained by varying concentration of AT and pH values in the precursor solution. Beside the absorption action of the NH4+ and Na+ ions, the capping effect can be reinforced by the hydrogen bonding from the tartrate groups in the crystallization process. The bandgap energies were modulated by the size of the nanostructured hex-WO3 crystals due to quantum confinement effect, which increases from 2.74 to 3.04 eV. Based on the analysis of the photoluminescence and X-ray photoelectron spectroscopy, the enhancement of the blue emission of the nanocrystals is assigned as a result of a complex of the local intercalation of the residual sodium ions and the oxygen vacancies or defects. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Hydrothermal synthesis and optical properties of hexagonal tungsten oxide nanocrystals assisted by ammonium tartrate

Selective oxidation of sulfides with H2O2 catalyzed by silica–tungstate core–shell nanoparticles

A series of tungsten oxide nanoparticles (NPs) has been synthesized via a green and straightforward approach exploiting bare tungsten powder as a precursor. The synthesized NPs were further organo-functionalized by cetyltrimethylammonium bromide (CTAB) in order to adjust their surface state and enhance their compatibility with biphasic oxidation of vegetable oils with H2O2. Simply, different structures of tungsten oxide were observed, which were characterized by XRD, FTIR, TGA, TEM, N2 adsorption/desorption isotherms, and zeta potential analysis. All the synthesized nanocatalysts could fully convert oleic acid, and the highest yield of production of the desired diacid (azelaic acid), ∼80%, was achieved by optimization of the CTA+ amount on the nanocatalyst’s surface, which show excellent activity compared to the reported heterogeneous works. Thanks to the organo-functionalization, this water-tolerant catalyst exhibited no significant leaching, as well as convenient recovery and steady reuse without a noti...

Synthesis, organo-functionalization, and catalytic properties of tungsten oxide nanoparticles as heterogeneous catalyst for oxidative cleavage of oleic acid as a model fatty acid into diacids

WO3/70 % TBHP/Aqueous NaOH: An Efficient Catalytic Combination for the Selective Oxidation of Methylarenes and Alkyl Aryl Ketones to Benzoic Acids

Structural effect of tungsten oxides on selective oxidation of cyclopentene to glutaraldehyde

Interaction of irradiation defects with precipitates in CuCrZr and Cu-1Fe alloys

Pre-stored edge dislocations-enabled pseudo-toughness in chromium

Method for producing tetrahydrofuran

Method for preparing mica titanium material

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