Vanadium-doped sodium phosphomolybdate salts as catalysts in the terpene alcohols oxidation with hydrogen peroxide
| Autor: | Sukarno Olavo Ferreira, Alana Alves Rodrigues, Rene Chagas da Silva, Márcio José da Silva, Castelo Bandane Vilanculo |
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| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
010405 organic chemistry General Chemical Engineering Inorganic chemistry Potentiometric titration Vanadium chemistry.chemical_element Infrared spectroscopy General Chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Nerol Hydrogen peroxide Stoichiometry |
| Zdroj: | RSC advances. 11(39) |
| ISSN: | 2046-2069 |
| Popis: | In this work, we have explored the catalytic activity of Keggin-type heteropolyanions PMo12−nVnO40(3+n)− (n = 0, 1, 2, or 3) in the form of sodium salts in green oxidation routes of terpene alcohols with hydrogen peroxide. Nerol was the model molecule selected to assess the impacts of the main reaction parameters, such as temperature, catalyst load, and stoichiometry of reactants. The impacts of the presence of vanadium at different proportions (i.e., V1, V2, and V3 loads/per anion) in the structure of phosphomolybdate catalysts were assessed. All the catalysts were characterized by various techniques such as powder X-ray diffraction, attenuated diffuse reflectance infrared spectroscopy, ultraviolet-visible spectroscopy, thermogravimetric analysis, isotherms of adsorption–desorption of N2 measurements of surface area, scanning electronic microscopy, energy-dispersive X-ray spectroscopy, and n-butylamine potentiometric titration. Among the catalysts assessed, Na4PMo11VO40 was the most active and selective toward epoxides. The efficiency of this catalyst in the epoxidation of different terpene alcohols was investigated. Special attention was dedicated to correlating the composition and properties of the vanadium-doped phosphomolybdic catalysts with their catalytic activity. |
| Databáze: | OpenAIRE |
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