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Investigation of the structure and catalytic performance of highly dispersed Ni - based catalysts for the growth of carbon nanostructures / Muzi Li in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11892–11900 Titre : Investigation of the structure and catalytic performance of highly dispersed Ni - based catalysts for the growth of carbon nanostructures Type de document : texte imprimé Auteurs : Muzi Li, Auteur ; Guoli Fan, Auteur ; Hua Qin, Auteur Année de publication : 2012 Article en page(s) : pp. 11892–11900 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalysts  Nanostructures Résumé : The in situ growth of Ni-containing layered double hydroxide (LDH) microcrystallites on microspherical γ-alumina support was carried out through the surface activation of support followed by a homogeneous coprecipitation process, and carbon nanomaterials were synthesized directly over as-grown supported LDH samples via catalytic chemical vapor deposition of acetylene. As compared to that prepared by the conventional impregnation, supported LDH samples calcined at 700 °C possessed higher metal dispersion, which was attributed to well-developed two-dimensional structure of LDH platelets uniformly grown on the support surface originating from the strong interaction between brucite-like lattices and support. Furthermore, the supported catalyst from NiAl-LDH could catalyze the growth of regular carbon nanofibers, while another one from NiMgAl-LDH exhibited excellent catalytic performance for the growth of uniform carbon nanotubes due to higher metal dispersion achieved by the separating effect of amorphous metal oxide (MgO and Al2O3) phases around Ni nanoparticles. As-synthesized supported Ni-based catalysts are promising for practical applications in the production of carbon nanostructures with uniform geometric shape. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3008659 [article] Investigation of the structure and catalytic performance of highly dispersed Ni - based catalysts for the growth of carbon nanostructures [texte imprimé] / Muzi Li, Auteur ; Guoli Fan, Auteur ; Hua Qin, Auteur . - 2012 . - pp. 11892–11900. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 11892–11900 Mots-clés : Catalysts  Nanostructures Résumé : The in situ growth of Ni-containing layered double hydroxide (LDH) microcrystallites on microspherical γ-alumina support was carried out through the surface activation of support followed by a homogeneous coprecipitation process, and carbon nanomaterials were synthesized directly over as-grown supported LDH samples via catalytic chemical vapor deposition of acetylene. As compared to that prepared by the conventional impregnation, supported LDH samples calcined at 700 °C possessed higher metal dispersion, which was attributed to well-developed two-dimensional structure of LDH platelets uniformly grown on the support surface originating from the strong interaction between brucite-like lattices and support. Furthermore, the supported catalyst from NiAl-LDH could catalyze the growth of regular carbon nanofibers, while another one from NiMgAl-LDH exhibited excellent catalytic performance for the growth of uniform carbon nanotubes due to higher metal dispersion achieved by the separating effect of amorphous metal oxide (MgO and Al2O3) phases around Ni nanoparticles. As-synthesized supported Ni-based catalysts are promising for practical applications in the production of carbon nanostructures with uniform geometric shape. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie3008659

Structure and catalytic property of Li–Al metal oxides from layered double hydroxide precursors prepared via a facile solution route / Jia Wang in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp 7120–7128 Titre : Structure and catalytic property of Li–Al metal oxides from layered double hydroxide precursors prepared via a facile solution route Type de document : texte imprimé Auteurs : Jia Wang, Auteur ; Zhiyi Lei, Auteur ; Hua Qin, Auteur Année de publication : 2011 Article en page(s) : pp 7120–7128 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Precursor  Catalytic  reaction Résumé : This paper presents the synthesis of Li–Al mixed metal oxides from Li–Al layered double hydroxides (LiAl-LDHs) by using a novel separate nucleation and solvothermal aging steps method. The physicochemical properties of as-synthesized LiAl-LDHs and resulting calcined products at 600 °C were investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), simultaneous thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscope (SEM), and low-temperature nitrogen adsorption–desorption experiments. The results indicated that uniform LiAl-LDH particles with smaller sizes were obtained by using ethanol as solvent in the aging step, in contrast with those by using water and water/ethanol mixture. Especially, after calcination, the resulting mixed metal oxides showed variable surface basicities, which were strongly dependent on their crystallite sizes and surface areas. When used as solid base catalysts for the Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate, the mixed metal oxides with more strong basic sites exhibited a higher catalytic activity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239025 [article] Structure and catalytic property of Li–Al metal oxides from layered double hydroxide precursors prepared via a facile solution route [texte imprimé] / Jia Wang, Auteur ; Zhiyi Lei, Auteur ; Hua Qin, Auteur . - 2011 . - pp 7120–7128. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp 7120–7128 Mots-clés : Precursor  Catalytic  reaction Résumé : This paper presents the synthesis of Li–Al mixed metal oxides from Li–Al layered double hydroxides (LiAl-LDHs) by using a novel separate nucleation and solvothermal aging steps method. The physicochemical properties of as-synthesized LiAl-LDHs and resulting calcined products at 600 °C were investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), simultaneous thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscope (SEM), and low-temperature nitrogen adsorption–desorption experiments. The results indicated that uniform LiAl-LDH particles with smaller sizes were obtained by using ethanol as solvent in the aging step, in contrast with those by using water and water/ethanol mixture. Especially, after calcination, the resulting mixed metal oxides showed variable surface basicities, which were strongly dependent on their crystallite sizes and surface areas. When used as solid base catalysts for the Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate, the mixed metal oxides with more strong basic sites exhibited a higher catalytic activity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239025