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An Efficient Catalyst for the Large Scale Production of Multi-Walled Carbon Nanotubes / Jayaseelan Logeswari in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13347–13354 Titre : An Efficient Catalyst for the Large Scale Production of Multi-Walled Carbon Nanotubes Type de document : texte imprimé Auteurs : Jayaseelan Logeswari, Auteur ; Arumugam Pandurangan, Auteur ; Dharmalingam Sangeetha, Auteur Année de publication : 2012 Article en page(s) : pp. 13347–13354 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon  nanotubes Résumé : The main objective of this work is to design an efficient catalyst for the synthesis of multiwalled carbon nanotubes (MWNTs) in our scalable, high quality with gram amount synthesis. The catalysts with composition of Fe, Mo, and MgO in the molar ratios 1:0.5:13, 1:1:13, and 1:1:50 were prepared by combustion method. The high acetylene conversion and carbon yield of chemical vapor deposition (CVD) reaction suggest the formation of MWNTs by 1:1:50 molar ratio catalysts under pyrolysis of the pure C2H2 gas with the flow rate about 60 mL/min at 800 ̊C for 30 min. The catalysts and the resulting CNT samples were analyzed by XRD, TGA, FT-Raman, SEM, and TEM to establish a relation between catalyst design and MWNT yield. Raman results indicate that CNTs are in multiwalled structure, since no single-walled characteristic features appear in the 200–400 cm–1 region. We give evidence that increased carbon conversion, carbon yields and % purity of more than 65%, 1000%, and 99%, respectively, with respect to our catalysts are directly related to ratio between Fe–Mo and MgO. One g of acetylene containing 0.9231 g of carbon would enter the reaction chamber, which is responsible for the 1.96, 1.9842, and 2.2356 g of the carbon deposition per 200 mg of catalyst A, B, and C respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102525u [article] An Efficient Catalyst for the Large Scale Production of Multi-Walled Carbon Nanotubes [texte imprimé] / Jayaseelan Logeswari, Auteur ; Arumugam Pandurangan, Auteur ; Dharmalingam Sangeetha, Auteur . - 2012 . - pp. 13347–13354. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13347–13354 Mots-clés : Carbon  nanotubes Résumé : The main objective of this work is to design an efficient catalyst for the synthesis of multiwalled carbon nanotubes (MWNTs) in our scalable, high quality with gram amount synthesis. The catalysts with composition of Fe, Mo, and MgO in the molar ratios 1:0.5:13, 1:1:13, and 1:1:50 were prepared by combustion method. The high acetylene conversion and carbon yield of chemical vapor deposition (CVD) reaction suggest the formation of MWNTs by 1:1:50 molar ratio catalysts under pyrolysis of the pure C2H2 gas with the flow rate about 60 mL/min at 800 ̊C for 30 min. The catalysts and the resulting CNT samples were analyzed by XRD, TGA, FT-Raman, SEM, and TEM to establish a relation between catalyst design and MWNT yield. Raman results indicate that CNTs are in multiwalled structure, since no single-walled characteristic features appear in the 200–400 cm–1 region. We give evidence that increased carbon conversion, carbon yields and % purity of more than 65%, 1000%, and 99%, respectively, with respect to our catalysts are directly related to ratio between Fe–Mo and MgO. One g of acetylene containing 0.9231 g of carbon would enter the reaction chamber, which is responsible for the 1.96, 1.9842, and 2.2356 g of the carbon deposition per 200 mg of catalyst A, B, and C respectively. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102525u

Catalytic wet peroxide oxidation technique for the removal of decontaminating agents ethylenediaminetetraacetic acid and oxalic acid from aqueous solution using efficient fenton type Fe-MCM-41 mesoporous materials / Narasimhan Gokulakrishnan in Industrial & engineering chemistry research, Vol. 48 N°3 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1556–1561 Titre : Catalytic wet peroxide oxidation technique for the removal of decontaminating agents ethylenediaminetetraacetic acid and oxalic acid from aqueous solution using efficient fenton type Fe-MCM-41 mesoporous materials Type de document : texte imprimé Auteurs : Narasimhan Gokulakrishnan, Auteur ; Arumugam Pandurangan, Auteur ; Pradeep Kumar Sinha, Auteur Année de publication : 2009 Article en page(s) : p. 1556–1561 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Peroxide  Oxidation  --  catalytic  Ethylenediaminetetraacetic  acid  Oxalic  acid  Waste  treatment Résumé : Catalytic wet peroxide oxidation (CWPO) of organic contaminants may have a possible path for the treatment of decontamination waste containing chelating agents that cause a complex with radioactive cations leading to interferences in their removal by various techniques and may pose a hazard to the environment. The aim of the present work was to synthesize and characterize the mesoporous Fe-MCM-41 with various Si/Fe ratios for evaluating the removal of organic contaminants such as ethylenediaminetetraacetic acid (EDTA) and oxalic acid in aqueous solution. The influence of reaction parameters such as time, pH, and temperature was studied to achieve efficient removal of organic contaminant. Among the catalysts studied, Fe-MCM-41 (Si/Fe = 25) provides high-percentage removal of total organic carbon in aqueous solution. The mineralization of organic contaminants was found to be higher in heterogeneous catalysis than homogeneous catalysis (Fe3+). Further, after the reaction, only a minimum percentage (2%) of Fe was leaching from Fe-MCM-41 under optimized condition and the catalyst remained unaltered in its structure. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800907y [article] Catalytic wet peroxide oxidation technique for the removal of decontaminating agents ethylenediaminetetraacetic acid and oxalic acid from aqueous solution using efficient fenton type Fe-MCM-41 mesoporous materials [texte imprimé] / Narasimhan Gokulakrishnan, Auteur ; Arumugam Pandurangan, Auteur ; Pradeep Kumar Sinha, Auteur . - 2009 . - p. 1556–1561. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°3 (Février 2009) . - p. 1556–1561 Mots-clés : Peroxide  Oxidation  --  catalytic  Ethylenediaminetetraacetic  acid  Oxalic  acid  Waste  treatment Résumé : Catalytic wet peroxide oxidation (CWPO) of organic contaminants may have a possible path for the treatment of decontamination waste containing chelating agents that cause a complex with radioactive cations leading to interferences in their removal by various techniques and may pose a hazard to the environment. The aim of the present work was to synthesize and characterize the mesoporous Fe-MCM-41 with various Si/Fe ratios for evaluating the removal of organic contaminants such as ethylenediaminetetraacetic acid (EDTA) and oxalic acid in aqueous solution. The influence of reaction parameters such as time, pH, and temperature was studied to achieve efficient removal of organic contaminant. Among the catalysts studied, Fe-MCM-41 (Si/Fe = 25) provides high-percentage removal of total organic carbon in aqueous solution. The mineralization of organic contaminants was found to be higher in heterogeneous catalysis than homogeneous catalysis (Fe3+). Further, after the reaction, only a minimum percentage (2%) of Fe was leaching from Fe-MCM-41 under optimized condition and the catalyst remained unaltered in its structure. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800907y