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Formation of carbon nanofibers from supported Pt catalysts through catalytic chemical vapor deposition from acetylene / Qilong Chen in Industrial & engineering chemistry research, Vol. 50 N° 15 (Août 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9034–9042 Titre : Formation of carbon nanofibers from supported Pt catalysts through catalytic chemical vapor deposition from acetylene Type de document : texte imprimé Auteurs : Qilong Chen, Auteur ; Jia Wang, Auteur ; Feng Li, Auteur Année de publication : 2011 Article en page(s) : pp. 9034–9042 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chemical  vapor  deposition  Catalytic  reaction  Catalyst Résumé : Carbon nanofibers (CNFs) were synthesized by catalytic chemical vapor deposition from acetylene from a series of supported Pt catalysts derived from Pt-containing Mg–Al layered double hydroxide precursors. The materials were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, temperature programmed reduction, low-temperature N2 adsorption–desorption experiments, X-ray photoelectron spectroscopy, and Raman spectroscopy. The effects of reaction temperature and Pt content on the morphologies and microstructures of CNFs were investigated. The results revealed that the reaction temperature of 600 °C was appropriate for the growth of uniform CNFs with regular shape. Furthermore, the structural defects and the diameters of CNFs were reduced with the increasing Pt content, which is attributable to the high dispersion of smaller Pt nanoparticles as well as the quick deposition rate of carbon atoms on active metal particles. The present work developed an additional approach to optimize the growth of CNFs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395850 [article] Formation of carbon nanofibers from supported Pt catalysts through catalytic chemical vapor deposition from acetylene [texte imprimé] / Qilong Chen, Auteur ; Jia Wang, Auteur ; Feng Li, Auteur . - 2011 . - pp. 9034–9042. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 15 (Août 2011) . - pp. 9034–9042 Mots-clés : Chemical  vapor  deposition  Catalytic  reaction  Catalyst Résumé : Carbon nanofibers (CNFs) were synthesized by catalytic chemical vapor deposition from acetylene from a series of supported Pt catalysts derived from Pt-containing Mg–Al layered double hydroxide precursors. The materials were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, temperature programmed reduction, low-temperature N2 adsorption–desorption experiments, X-ray photoelectron spectroscopy, and Raman spectroscopy. The effects of reaction temperature and Pt content on the morphologies and microstructures of CNFs were investigated. The results revealed that the reaction temperature of 600 °C was appropriate for the growth of uniform CNFs with regular shape. Furthermore, the structural defects and the diameters of CNFs were reduced with the increasing Pt content, which is attributable to the high dispersion of smaller Pt nanoparticles as well as the quick deposition rate of carbon atoms on active metal particles. The present work developed an additional approach to optimize the growth of CNFs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24395850

Preparation and properties of microspherical alumina with a magnetic core/shell structure / Jun-Ting Feng in Industrial & engineering chemistry research, Vol. 48 N°2 (Janvier 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p.692–697 Titre : Preparation and properties of microspherical alumina with a magnetic core/shell structure Type de document : texte imprimé Auteurs : Jun-Ting Feng, Auteur ; Lin, Yan-Jun, Auteur ; Feng Li, Auteur ; David G. Evans, Auteur Année de publication : 2009 Article en page(s) : p.692–697 Note générale : chemical engenireeng Langues : Anglais (eng) Mots-clés : Microspherical  --  Alumina Résumé : A series of Ni2+−Co2+−Fe2+−Fe3+−SO42− layered double hydroxide precursors with different Ni/Co ratios have been synthesized by a method involving separate nucleation and aging steps. After calcination at 900 °C, the corresponding Ni1-xCoxFe oxides were obtained. Vibrating sample magnetometry indicated that the Ni1-xCoxFe oxide samples not only had high specific saturation magnetization, but also low coercivity and remanence. Ni1-xCoxFe oxides showed the optimum combination of magnetic properties for x = 0.2. Silica was coated onto the surface of Ni0.8Co0.2Fe oxide particles, and the coated particles were used as magnetic cores to prepare magnetic Ni0.8Co0.2Fe oxide/SiO2/γ-Al2O3 particles by hydrolysis of aluminum isopropoxide. After repeating the hydrolysis twice more, Ni0.8Co0.2Fe oxide/SiO2/γ-Al2O3 particles with about 20 wt % Ni0.8Co0.2Fe oxide were obtained and shown to be suitable for practical applications as a magnetic catalyst or catalyst support by virtue of their efficacious magnetic properties and pore structure. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801098k [article] Preparation and properties of microspherical alumina with a magnetic core/shell structure [texte imprimé] / Jun-Ting Feng, Auteur ; Lin, Yan-Jun, Auteur ; Feng Li, Auteur ; David G. Evans, Auteur . - 2009 . - p.692–697. chemical engenireeng Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°2 (Janvier 2009) . - p.692–697 Mots-clés : Microspherical  --  Alumina Résumé : A series of Ni2+−Co2+−Fe2+−Fe3+−SO42− layered double hydroxide precursors with different Ni/Co ratios have been synthesized by a method involving separate nucleation and aging steps. After calcination at 900 °C, the corresponding Ni1-xCoxFe oxides were obtained. Vibrating sample magnetometry indicated that the Ni1-xCoxFe oxide samples not only had high specific saturation magnetization, but also low coercivity and remanence. Ni1-xCoxFe oxides showed the optimum combination of magnetic properties for x = 0.2. Silica was coated onto the surface of Ni0.8Co0.2Fe oxide particles, and the coated particles were used as magnetic cores to prepare magnetic Ni0.8Co0.2Fe oxide/SiO2/γ-Al2O3 particles by hydrolysis of aluminum isopropoxide. After repeating the hydrolysis twice more, Ni0.8Co0.2Fe oxide/SiO2/γ-Al2O3 particles with about 20 wt % Ni0.8Co0.2Fe oxide were obtained and shown to be suitable for practical applications as a magnetic catalyst or catalyst support by virtue of their efficacious magnetic properties and pore structure. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801098k

Study on the mechanism and kinetics of the thermal decomposition of Ni/Al layered double hydroxide nitrate / Liren Wang in Industrial & engineering chemistry research, Vol. 47 N°19 (Octobre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7211–7218 Titre : Study on the mechanism and kinetics of the thermal decomposition of Ni/Al layered double hydroxide nitrate Type de document : texte imprimé Auteurs : Liren Wang, Auteur ; Zhi Lü, Auteur ; Feng Li, Auteur Année de publication : 2008 Article en page(s) : p. 7211–7218 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Ni/Al  layered  double  hydroxide  nitrate  Thermal  decomposition  Mass  spectrometry Résumé : In the paper, the mechanism and kinetics of thermal decomposition of Ni/Al layered double hydroxide nitrate with a Ni/Al molar ratio of 3.0 (NiAl-LDH) were studied by thermogravimetry/differential thermal analysis coupled with mass spectrometry (TG/DTA−MS). The results indicated that the thermal decomposition of NiAl-LDH proceeds in three individual processes, i.e., removal of the physisorbed and interlayer water, dehydroxylation of the layers, and decomposition of the interlayer nitrate ions (denitration). The mechanism and kinetics of dehydroxylation and denitration, which take place simultaneously almost in the same region of temperatures, were separately achieved by only using MS data sets recorded at different heating rates. The dehytroxylation follows a two-dimensional diffusion-controlled mechanism with instantaneous nucleation represented by the first-order Avrami−Erofe’ev equation with an average activation energy of ca. 129.0 kJ·mol−1, while the denitration obeys a three-dimensional diffusion-controlled mechanism represented by the Zhuralev−Lesokin−Tempelman equation with an average activation energy of ca. 137.2 kJ·mol−1. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800609c [article] Study on the mechanism and kinetics of the thermal decomposition of Ni/Al layered double hydroxide nitrate [texte imprimé] / Liren Wang, Auteur ; Zhi Lü, Auteur ; Feng Li, Auteur . - 2008 . - p. 7211–7218. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N°19 (Octobre 2008) . - p. 7211–7218 Mots-clés : Ni/Al  layered  double  hydroxide  nitrate  Thermal  decomposition  Mass  spectrometry Résumé : In the paper, the mechanism and kinetics of thermal decomposition of Ni/Al layered double hydroxide nitrate with a Ni/Al molar ratio of 3.0 (NiAl-LDH) were studied by thermogravimetry/differential thermal analysis coupled with mass spectrometry (TG/DTA−MS). The results indicated that the thermal decomposition of NiAl-LDH proceeds in three individual processes, i.e., removal of the physisorbed and interlayer water, dehydroxylation of the layers, and decomposition of the interlayer nitrate ions (denitration). The mechanism and kinetics of dehydroxylation and denitration, which take place simultaneously almost in the same region of temperatures, were separately achieved by only using MS data sets recorded at different heating rates. The dehytroxylation follows a two-dimensional diffusion-controlled mechanism with instantaneous nucleation represented by the first-order Avrami−Erofe’ev equation with an average activation energy of ca. 129.0 kJ·mol−1, while the denitration obeys a three-dimensional diffusion-controlled mechanism represented by the Zhuralev−Lesokin−Tempelman equation with an average activation energy of ca. 137.2 kJ·mol−1. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800609c