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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Investigating the catalytic activity of monoclinic zirconia ; oxidation of benzyl alcohol in aqueous medium at mild conditions / 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. 37-42 Titre : Investigating the catalytic activity of monoclinic zirconia ; oxidation of benzyl alcohol in aqueous medium at mild conditions Type de document : texte imprimé Auteurs : M. Sadiq, Auteur ; M. Ilyas, Auteur ; S. Alam, Auteur Année de publication : 2012 Article en page(s) : p. 37-42 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool benzylique -- Oxydation Benzoïque, Acide Catalyse Eaux usées -- Epuration Surfactants Zirconium Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The oxidation/degradation of benzyl alcohol in artificially contaminated water under atmospheric pressure by molecular oxygen/air over ZrO2(m) catalyst was investigated. Monoclinic phase ZrO2 was synthesized and characterized by modern techniques. Oxidation of benzyl alcohol in aqueous medium was carried out in a typical three necked double walled batch reactor equipped with thermometer and condenser. The rate of oxidation was affected by different reaction parameters such as speed of agitation, catalyst loading, temperature, concentration of substrate solution (46.3–185 mmol/L) and partial pressure of oxygen. Major products were detected with GC and UV spectrophotometer. Optimal conditions were setup for better catalytic activity of ZrO2(m). To sum up, catalytic oxidation of benzyl alcohol in aqueous medium by ZrO2(m) is a useful and cheaper method for the conversion of benzyl alcohol to valuable products as well as for the removal of benzyl alcohol from industrial waste water. Note de contenu : - EXPERIMENTAL : Chemicals - Typical procedure for catalyst preparation - Catalytic test and analysis - RESULTS AND DISCUSSION : Characterization of catalyst - Oxidation alcohol in aqueous medium - Effects of different parameters Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13311 [article]

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Removal of triphenylmethane dye from aqueous solution by carbonaceous adsorbent / S. Alam in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 48, N° 2/2011 (03-04/2011)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 48, N° 2/2011 (03-04/2011) . - p. 134-142 Titre : Removal of triphenylmethane dye from aqueous solution by carbonaceous adsorbent Type de document : texte imprimé Auteurs : S. Alam, Auteur ; M. Mabood, Auteur ; M. Sadiq, Auteur ; Noor-ul-Amin, Auteur ; F. K. Bangash, Auteur Année de publication : 2011 Article en page(s) : p. 134-142 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Charbon actif Cinétique chimique Triphénylméthane Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Removal of acid blue 1 from aqueous solution on activated carbon produced from Salvadora oleoides was investigated. The samples were characterized by BET surface area, BJH pore volume and pore diameter, XRD, SEM, EDS and FTIR analysis. The surfaces contain functional groups like ketones and hydroxyl which disappeared at high activation temperature; relatively high amount of carbon w. r. t. oxygen was found with the increase in activation temperature; the increase in surface area and development of porous structures showed a positive effect on the adsorption capacity. Adsorption of the dye on carbon at 10 and 45°C showed that the first order, Bangham and Elovich and parabolic diffusion equations apply to the kinetic data. The adsorption rate increased with the temperature and with thermal activation of the sample. Thermodynamic parameters like ΔE≠, ΔH≠, ΔS≠ and ΔG≠ were calculated from the kinetic data. The negative values of ΔS≠ reflect decrease in the disorder of the system at the solid-solution interface during adsorption. Gibbs free energy (ΔG≠), which represents the driving force for the affinity of dye for the carbon, increased with the increase in activation temperature. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11122 [article]

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