Cu x H 3 - 2 x PW12O40 supported on MCM - 41 / Dharitri Rath in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8942-8948 Titre : Cu x H 3 - 2 x PW12O40 supported on MCM - 41 : Their activity to heck vinylation of aryl halides Type de document : texte imprimé Auteurs : Dharitri Rath, Auteur ; Surjyakanta Rana, Auteur ; K. M. Parida, Auteur Année de publication : 2010 Article en page(s) : pp. 8942-8948 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Heteropoly acid Catalysts Résumé : A series of Cu salts of heteropoly acid (CuxH3−2xPW12O40) supported MCM-41 catalysts (CuxH3−2xPW12O40/MCM-41) was synthesized by wet impregnation method and thoroughly characterized by using various analytical techniques, viz., X-ray diffraction, UV−vis diffused reflectance spectroscopy (UV−vis DRS), nitrogen adsorption desorption, temperature-programmed reduction (TPR), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). From XRD and FT-IR studies, we confirmed that the Keggin structure of heteropoly acid (HPA) is retained in Cu salt of HPA. Heck vinylation was performed to examine the catalytic properties of the catalysts. The 50 wt % CuxH3−2xPW12O40/MCM-41 showed remarkable catalytic performance of phenyl iodide (98% conversion) to cinnamic acid in aqueous medium compared with MCM-41 and other catalytic systems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100895v [article] Cu x H 3 - 2 x PW12O40 supported on MCM - 41 : Their activity to heck vinylation of aryl halides [texte imprimé] / Dharitri Rath, Auteur ; Surjyakanta Rana, Auteur ; K. M. Parida, Auteur . - 2010 . - pp. 8942-8948. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 8942-8948 Mots-clés : Heteropoly acid Catalysts Résumé : A series of Cu salts of heteropoly acid (CuxH3−2xPW12O40) supported MCM-41 catalysts (CuxH3−2xPW12O40/MCM-41) was synthesized by wet impregnation method and thoroughly characterized by using various analytical techniques, viz., X-ray diffraction, UV−vis diffused reflectance spectroscopy (UV−vis DRS), nitrogen adsorption desorption, temperature-programmed reduction (TPR), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). From XRD and FT-IR studies, we confirmed that the Keggin structure of heteropoly acid (HPA) is retained in Cu salt of HPA. Heck vinylation was performed to examine the catalytic properties of the catalysts. The 50 wt % CuxH3−2xPW12O40/MCM-41 showed remarkable catalytic performance of phenyl iodide (98% conversion) to cinnamic acid in aqueous medium compared with MCM-41 and other catalytic systems. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100895v

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Fe/meso-Al2O3 / K. M. Parida in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8310–8318 Titre : Fe/meso-Al2O3 : an efficient photo-fenton catalyst for the adsorptive degradation of phenol Type de document : texte imprimé Auteurs : K. M. Parida, Auteur ; Amaresh C. Pradhan, Auteur Année de publication : 2010 Article en page(s) : pp. 8310–8318 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst Mesoporous Résumé : A series of Fe(II)/meso-Al2O3 catalysts was prepared by the wetness impregnation method using ferrous sulfate and mesoporous alumina. Mesoporous alumina was synthesized at pH 6 by the precipitation method using aluminum isopropoxide as the aluminum source and sucrose as the template. These catalysts were characterized by different techniques such as SEM, XRD, XPS, FTIR spectroscopy, and BET surface area analysis. The catalytic activities in phenol degradation by the photo-Fenton reaction were evaluated. The effects of H2O2 concentration, pH, and additive (ethanol) on the photo-Fenton reaction were studied. The sample with 0.25 wt % Fe(II)/meso-Al2O3-6 was found to be an efficient catalyst, showing 98% degradation of 2.1 × 10−5 mol of phenol at pH 6 in 1 h. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902049s [article] Fe/meso-Al2O3 : an efficient photo-fenton catalyst for the adsorptive degradation of phenol [texte imprimé] / K. M. Parida, Auteur ; Amaresh C. Pradhan, Auteur . - 2010 . - pp. 8310–8318. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8310–8318 Mots-clés : Catalyst Mesoporous Résumé : A series of Fe(II)/meso-Al2O3 catalysts was prepared by the wetness impregnation method using ferrous sulfate and mesoporous alumina. Mesoporous alumina was synthesized at pH 6 by the precipitation method using aluminum isopropoxide as the aluminum source and sucrose as the template. These catalysts were characterized by different techniques such as SEM, XRD, XPS, FTIR spectroscopy, and BET surface area analysis. The catalytic activities in phenol degradation by the photo-Fenton reaction were evaluated. The effects of H2O2 concentration, pH, and additive (ethanol) on the photo-Fenton reaction were studied. The sample with 0.25 wt % Fe(II)/meso-Al2O3-6 was found to be an efficient catalyst, showing 98% degradation of 2.1 × 10−5 mol of phenol at pH 6 in 1 h. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie902049s

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Solar light active photodegradation of phenol over a FexTi1−xO2−yNy nanophotocatalyst / Brundabana Naik in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8339–8346 Titre : Solar light active photodegradation of phenol over a FexTi1−xO2−yNy nanophotocatalyst Type de document : texte imprimé Auteurs : Brundabana Naik, Auteur ; K. M. Parida, Auteur Année de publication : 2010 Article en page(s) : pp. 8339–8346 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Nanophotocatalyst Résumé : This article details the preparation, characterization, and catalytic activity evaluation of an efficient mesoporous FexTi1−xO2−yNy nanophotocatalyst (FeNT) for the degradation of phenol under direct solar light illumination. For fabrication of the FeNT, Fe doped TiO2 (FeT) was first prepared by a nonhydrolytic sol−gel route and N doping was subsequently performed by heating the resultant materials under a flow of NH3. The samples were analyzed by XRD, SEM, UV-vis DRS, FTIR, PL, and XPS to investigate the structural, electronic and optical features. FeNT samples exhibit about 1.5 fold higher direct solar light induced photocatalytic activity than the FeT catalyst and N doped TiO2 (NT). A noticeable red shift of the absorption edge and ca. 1.2 eV band gap narrowing is confirmed by UV-vis DRS. XPS has been applied to characterize the element oxidation state and near surface composition of catalysts. The presence of Fe ion facilitates the surface charge transfer process. Overall, the synergistic effect of iron and nitrogen greatly enhances the photocatalytic activity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100889m [article] Solar light active photodegradation of phenol over a FexTi1−xO2−yNy nanophotocatalyst [texte imprimé] / Brundabana Naik, Auteur ; K. M. Parida, Auteur . - 2010 . - pp. 8339–8346. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8339–8346 Mots-clés : Nanophotocatalyst Résumé : This article details the preparation, characterization, and catalytic activity evaluation of an efficient mesoporous FexTi1−xO2−yNy nanophotocatalyst (FeNT) for the degradation of phenol under direct solar light illumination. For fabrication of the FeNT, Fe doped TiO2 (FeT) was first prepared by a nonhydrolytic sol−gel route and N doping was subsequently performed by heating the resultant materials under a flow of NH3. The samples were analyzed by XRD, SEM, UV-vis DRS, FTIR, PL, and XPS to investigate the structural, electronic and optical features. FeNT samples exhibit about 1.5 fold higher direct solar light induced photocatalytic activity than the FeT catalyst and N doped TiO2 (NT). A noticeable red shift of the absorption edge and ca. 1.2 eV band gap narrowing is confirmed by UV-vis DRS. XPS has been applied to characterize the element oxidation state and near surface composition of catalysts. The presence of Fe ion facilitates the surface charge transfer process. Overall, the synergistic effect of iron and nitrogen greatly enhances the photocatalytic activity. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100889m

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