Potentiality of heteropolytungstates as catalysts in the selective oxidation of diphenylsulfide to diphenylsulfoxide
The activity of complex heteropolytungstates of general formula B-α-[M<sup>II</sup><sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>(PW<sub>9</sub>O<sub>34</sub>)<sub>2</sub>]<sup>10-</sup> with M= Co(II), Zn(II),...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2009
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/104497 http://hdl.handle.net/11336/56016 https://www.aqa.org.ar/images/anales/pdf9701/9701art15.pdf |
| Aporte de: |
| Sumario: | The activity of complex heteropolytungstates of general formula B-α-[M<sup>II</sup><sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>(PW<sub>9</sub>O<sub>34</sub>)<sub>2</sub>]<sup>10-</sup> with M= Co(II), Zn(II), Mn(II) and Cu(II) (PWM) was investigated in the selective oxidation reaction of diphenylsulfide to diphenylsulfoxide in presence of <i>tert</i>-butylhydroperoxide as oxidant. The characterization of phases was performed by X Ray Powder Diffraction, XRD. All phases resulted isomorphous although PWCu is obtained as a mixture of two structural isomers [Cu<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>PW<sub>10</sub>O<sub>38</sub>]<sup>7-</sup>.
The oxidation reaction was carried out in batch at 80°C using toluene as solvent and tbutylhydroperoxide 5-6 M in decane as oxidant for 6 h. The catalytic evaluation made by gas chromatography revealed a similar behavior with conversions of diphenylsulfide around 60% and high selectivity to diphenylsulfoxide near to 95% for most of phases studied while PWCu resulted the most active catalyst presenting a conversion of 84%. The activity rise was correlated with the increase of the oxidant character of the cluster metal(II). |
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