La1–xKxCoO3 and LaCo1–yFeyO3 perovskite oxides / Feng Bin in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6660–6667 Titre : La1–xKxCoO3 and LaCo1–yFeyO3 perovskite oxides : preparation, characterization, and catalytic performance in the simultaneous removal of NOx and diesel soot Type de document : texte imprimé Auteurs : Feng Bin, Auteur ; Chonglin Song, Auteur ; Gang Lv, Auteur Année de publication : 2011 Article en page(s) : pp 6660–6667 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : catalysts Nitrogen sorption X-ray diffraction Résumé : Perovskite-type La1–xKxCoO3 and LaCo1–yFeyO3 catalysts were prepared and characterized by nitrogen sorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Catalytic activity for the simultaneous removal of NOx and soot was investigated using temperature-programmed reactions. For the La1–xKxCoO3 series, the introduction of K ions into the A-site caused the enhancement of Co valence state, which was beneficial to improving the catalytic activity. Excess K ions produced a Co3O4 phase adhering to the perovskite crystals, but the rhombohedral perovskite structure was well-maintained. In contrast, the B-site could be substituted by Fe ions with the doping ratio changing from null to 0.5, and no secondary phases were detected. With increasing K substitution, NOx conversion in the La1–xKxCoO3 series showed a declining trend after an initial ascent. The Co3O4 particles produced at high K content were responsible for this falling catalytic activity. For the LaCo1–yFeyO3 series, catalytic performances showed a monotonously decreasing trend as a function of Fe substitution. Among all of the perovskite oxides tested in this study, the La0.6K0.4CoO3 sample exhibited the highest catalytic activity for the simultaneous removal of NOx and soot. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200196r [article] La1–xKxCoO3 and LaCo1–yFeyO3 perovskite oxides : preparation, characterization, and catalytic performance in the simultaneous removal of NOx and diesel soot [texte imprimé] / Feng Bin, Auteur ; Chonglin Song, Auteur ; Gang Lv, Auteur . - 2011 . - pp 6660–6667. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6660–6667 Mots-clés : catalysts Nitrogen sorption X-ray diffraction Résumé : Perovskite-type La1–xKxCoO3 and LaCo1–yFeyO3 catalysts were prepared and characterized by nitrogen sorption, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Catalytic activity for the simultaneous removal of NOx and soot was investigated using temperature-programmed reactions. For the La1–xKxCoO3 series, the introduction of K ions into the A-site caused the enhancement of Co valence state, which was beneficial to improving the catalytic activity. Excess K ions produced a Co3O4 phase adhering to the perovskite crystals, but the rhombohedral perovskite structure was well-maintained. In contrast, the B-site could be substituted by Fe ions with the doping ratio changing from null to 0.5, and no secondary phases were detected. With increasing K substitution, NOx conversion in the La1–xKxCoO3 series showed a declining trend after an initial ascent. The Co3O4 particles produced at high K content were responsible for this falling catalytic activity. For the LaCo1–yFeyO3 series, catalytic performances showed a monotonously decreasing trend as a function of Fe substitution. Among all of the perovskite oxides tested in this study, the La0.6K0.4CoO3 sample exhibited the highest catalytic activity for the simultaneous removal of NOx and soot. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200196r

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Synthesis of La0.9K0.1CoO3 fibers and the catalytic properties for diesel soot removal / Cairong Gong in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4374–4378 Titre : Synthesis of La0.9K0.1CoO3 fibers and the catalytic properties for diesel soot removal Type de document : texte imprimé Auteurs : Cairong Gong, Auteur ; Chonglin Song, Auteur ; Yiqiang Pei, Auteur ; Lv Gang, Auteur Année de publication : 2008 Article en page(s) : p. 4374–4378 Note générale : Bibliogr. p. 4378 Langues : Anglais (eng) Mots-clés : La0.9K0.1CoO3 fibers  Calcination process  Scanning electron microscopy Résumé : La0.9K0.1CoO3 perovskite type oxide fibers have been prepared by a sol−gel process combined with electrospinning procedure. The reactions during the calcination process of fibers have been tracked and characterized by TG, IR, and XRD. The prepared La0.9K0.1CoO3 fibers are composed of nanoparticles and the BET surface area is 7.1 m2/g. The scanning electron microscopy (SEM) results indicate that each individual fiber is uniform in cross section, and the average diameter of this sample is 600 nm. The catalytic activity for the combustion of soot particulate is evaluated by the technique of the temperature-programmed reaction, and the combustion temperature of carbon is indeed significantly lower than that of noncatalytic combustion under loose contact conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071599f [article] Synthesis of La0.9K0.1CoO3 fibers and the catalytic properties for diesel soot removal [texte imprimé] / Cairong Gong, Auteur ; Chonglin Song, Auteur ; Yiqiang Pei, Auteur ; Lv Gang, Auteur . - 2008 . - p. 4374–4378. Bibliogr. p. 4378 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4374–4378 Mots-clés : La0.9K0.1CoO3 fibers  Calcination process  Scanning electron microscopy Résumé : La0.9K0.1CoO3 perovskite type oxide fibers have been prepared by a sol−gel process combined with electrospinning procedure. The reactions during the calcination process of fibers have been tracked and characterized by TG, IR, and XRD. The prepared La0.9K0.1CoO3 fibers are composed of nanoparticles and the BET surface area is 7.1 m2/g. The scanning electron microscopy (SEM) results indicate that each individual fiber is uniform in cross section, and the average diameter of this sample is 600 nm. The catalytic activity for the combustion of soot particulate is evaluated by the technique of the temperature-programmed reaction, and the combustion temperature of carbon is indeed significantly lower than that of noncatalytic combustion under loose contact conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071599f

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