Investigating the activity of zirconia as a catalyst and a support for noble metals, in green oxidation of cyclohexane / M. Sadiq in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 1 (01-02/2012)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 1 (01-02/2012) . - p. 32-36 Titre : Investigating the activity of zirconia as a catalyst and a support for noble metals, in green oxidation of cyclohexane Type de document : texte imprimé Auteurs : M. Sadiq, Auteur ; S. Alam, Auteur ; F. Mabood, Auteur ; F. K. Bangash, Auteur ; M. Ilyas, Auteur Année de publication : 2012 Article en page(s) : p. 32-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés organiques volatils -- Oxydation Cyclohexane -- Oxydation liquides Surfactants Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Green oxidation of cyclohexane by molecular oxygen was carried out over ZrO2 and noble metals (Pd and Pt) supported on zirconia in solvent free conditions. Studies have been carried out in a typical three-necked batch reactor. Reaction products were identified by GC and UV spectrophotometer. Reaction rates were determined as a function of temperature, partial pressure of oxygen, amount of catalyst, volume of reactants, agitation and reaction duration. The agitation effect and activation energy revealed the absence of mass transfer resistance. Experimental results unveiled the effect of morphology of ZrO2 on catalysis. 1.0 wt.% noble metal/ZrO2(m) was found more selective for cyclohexanol production at low temperature, agitation 900 rpm and partial pressure of 101.325 KPa while at high temperature cyclohexanol was further oxidized to cyclohexanone. Comparison of Pt/ZrO2 and Pd/ZrO2 catalysts was made on the basis of reactivity and selectivity. Catalysts were characterized by using BET surface area and pore size analyzer, XRD and SEM. To conclude shortly, for the oxidation of cyclohexane, platinum or palladium supported on zirconia are selective, recyclable and could behave as truly heterogeneous catalysts. Note de contenu : - EXPERIMENTAL : General - Preparation of catalyst - General procedure for oxidation of cyclohexane - RESULTS AND DISCUSSION : Characterization of catalyst - Oxidationof cyclohexane - Optimal conditions for catalytic activity Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13310 [article]

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