Facile method for the synthesis of phosphomolybdic acid supported on zirconia – ceria mixed oxide and its catalytic evaluation in the solvent - free oxidation of benzyl alcohol / Sujata Mallick in Industrial & engineering chemistry research, Vol. 51 N° 23 (Juin 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7859–7866 Titre : Facile method for the synthesis of phosphomolybdic acid supported on zirconia – ceria mixed oxide and its catalytic evaluation in the solvent - free oxidation of benzyl alcohol Type de document : texte imprimé Auteurs : Sujata Mallick, Auteur ; Surjyakanta Rana, Auteur ; Kulamani Parida, Auteur Année de publication : 2012 Article en page(s) : pp. 7859–7866 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Oxide Catalytic evaluation Résumé : A series of phosphomolybdic acid (5–20 wt % PMA) promoted zirconia–ceria (ZrO2–CeO2) mixed oxides were synthesized by an impregnation method and characterized by XRD, nitrogen adsorption/desorption, UV–vis DR spectroscopy, TPR/TPD, and 31P MAS NMR spectroscopy. NMR spectra revealed that the catalyst retained the Keggin structure of PMA even after calcination at 500 °C. The catalysts were screened for the solvent-free liquid-phase oxidation of benzyl alcohols using hydrogen peroxide as the oxidizing agent. The sample of 15 wt % PMA/ZrO2–CeO2 showed 85% conversion and 96% selectivity to the corresponding aldehydes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2022724 [article] Facile method for the synthesis of phosphomolybdic acid supported on zirconia – ceria mixed oxide and its catalytic evaluation in the solvent - free oxidation of benzyl alcohol [texte imprimé] / Sujata Mallick, Auteur ; Surjyakanta Rana, Auteur ; Kulamani Parida, Auteur . - 2012 . - pp. 7859–7866. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 23 (Juin 2012) . - pp. 7859–7866 Mots-clés : Oxide Catalytic evaluation Résumé : A series of phosphomolybdic acid (5–20 wt % PMA) promoted zirconia–ceria (ZrO2–CeO2) mixed oxides were synthesized by an impregnation method and characterized by XRD, nitrogen adsorption/desorption, UV–vis DR spectroscopy, TPR/TPD, and 31P MAS NMR spectroscopy. NMR spectra revealed that the catalyst retained the Keggin structure of PMA even after calcination at 500 °C. The catalysts were screened for the solvent-free liquid-phase oxidation of benzyl alcohols using hydrogen peroxide as the oxidizing agent. The sample of 15 wt % PMA/ZrO2–CeO2 showed 85% conversion and 96% selectivity to the corresponding aldehydes. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2022724

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire

Liquid phase hydrodechlorination of chlorobenzene over bimetallic supported zirconia catalyst / Sujata Mallick in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12439-12448 Titre : Liquid phase hydrodechlorination of chlorobenzene over bimetallic supported zirconia catalyst Type de document : texte imprimé Auteurs : Sujata Mallick, Auteur ; Surjyakanta Rana, Auteur ; Kulamani Parida, Auteur Année de publication : 2012 Article en page(s) : pp. 12439-12448 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst Liquid phase Résumé : Mesoporous zirconia was prepared by the surfactant-assisted route, using cetyltrimethylammonium bromide as cationic surfactant. The synthesized zirconia was employed as support for copper and nickel bimetallic catalysts in the hydrodehalogenation reaction of chlorobenzenes and substituted chlorobenzenes at room temperature. The catalysts were characterized by nitrogen adsorption-desorption, X-ray powder diffraction, Fourier-transfer infrared spectroscopy (FTIR), transmittance electron micrograph (TEM), UV-vis diffuse reflectance spectroscopy (UV—vis DRS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The nitrogen adsorption—desorption studies revealed that the modified samples retain the mesoporosity. TEM studies showed uniform distribution of metals having 5-10 nm particles size on the support surface. The bimetallic catalyst exhibited a higher H2 chemisorption capacity relative to monometallic catalysts. For catalytic hydrodehalogenation of chlorobenzene, bimetallic catalyst showed 95% conversion with 100% selectivity for benzene as compared to monometallic catalysts, indicative of the synergy effect of copper, nickel supported on zirconia. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745717 [article] Liquid phase hydrodechlorination of chlorobenzene over bimetallic supported zirconia catalyst [texte imprimé] / Sujata Mallick, Auteur ; Surjyakanta Rana, Auteur ; Kulamani Parida, Auteur . - 2012 . - pp. 12439-12448. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12439-12448 Mots-clés : Catalyst Liquid phase Résumé : Mesoporous zirconia was prepared by the surfactant-assisted route, using cetyltrimethylammonium bromide as cationic surfactant. The synthesized zirconia was employed as support for copper and nickel bimetallic catalysts in the hydrodehalogenation reaction of chlorobenzenes and substituted chlorobenzenes at room temperature. The catalysts were characterized by nitrogen adsorption-desorption, X-ray powder diffraction, Fourier-transfer infrared spectroscopy (FTIR), transmittance electron micrograph (TEM), UV-vis diffuse reflectance spectroscopy (UV—vis DRS), temperature programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The nitrogen adsorption—desorption studies revealed that the modified samples retain the mesoporosity. TEM studies showed uniform distribution of metals having 5-10 nm particles size on the support surface. The bimetallic catalyst exhibited a higher H2 chemisorption capacity relative to monometallic catalysts. For catalytic hydrodehalogenation of chlorobenzene, bimetallic catalyst showed 95% conversion with 100% selectivity for benzene as compared to monometallic catalysts, indicative of the synergy effect of copper, nickel supported on zirconia. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745717

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité
aucun exemplaire