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Preparation of nano-Pd/SiO2 by one-step flame spray pyrolysis and its hydrogenation activities / Okorn Mekasuwandumrong in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2819–2825 Titre : Preparation of nano-Pd/SiO2 by one-step flame spray pyrolysis and its hydrogenation activities : comparison to the conventional impregnation method Type de document : texte imprimé Auteurs : Okorn Mekasuwandumrong, Auteur ; Sirima Somboonthanakij, Auteur ; Piyasan Praserthdam, Auteur Année de publication : 2009 Article en page(s) : pp. 2819–2825 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nano-Pd/SiO2  catalysts  Flame  spray  pyrolysis  Conventional  impregnation  method Résumé : Characteristics and catalytic properties of the nano-Pd/SiO2 catalysts synthesized in one-step flame spray pyrolysis (FSP) were compared to those prepared on the flame-made SiO2 supports by conventional impregnation method. Pd0 metal particles/clusters <3 nm in size were obtained directly from a single-step flame process, whereas the conventional impregnation method resulted in PdO with larger crystallite sizes (in the range of 5−12 nm). Although there was little difference in the turnover frequency (TOF) values for 1-heptyne hydrogenation on the different Pd/SiO2 catalysts prepared by impregnation, the TOF values of the flame-made catalysts decreased from 66.2 s−1 to 4.3 s−1 as the palladium loading increased from 0.5 wt % to 10 wt %, which suggested changes in the catalytic properties when palladium nanoparticles were formed simultaneously in the support matrices by FSP method. For both preparation methods, the palladium particle sizes remained unaltered after liquid-phase hydrogenation reaction. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012055 [article] Preparation of nano-Pd/SiO2 by one-step flame spray pyrolysis and its hydrogenation activities : comparison to the conventional impregnation method [texte imprimé] / Okorn Mekasuwandumrong, Auteur ; Sirima Somboonthanakij, Auteur ; Piyasan Praserthdam, Auteur . - 2009 . - pp. 2819–2825. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 2819–2825 Mots-clés : Nano-Pd/SiO2  catalysts  Flame  spray  pyrolysis  Conventional  impregnation  method Résumé : Characteristics and catalytic properties of the nano-Pd/SiO2 catalysts synthesized in one-step flame spray pyrolysis (FSP) were compared to those prepared on the flame-made SiO2 supports by conventional impregnation method. Pd0 metal particles/clusters <3 nm in size were obtained directly from a single-step flame process, whereas the conventional impregnation method resulted in PdO with larger crystallite sizes (in the range of 5−12 nm). Although there was little difference in the turnover frequency (TOF) values for 1-heptyne hydrogenation on the different Pd/SiO2 catalysts prepared by impregnation, the TOF values of the flame-made catalysts decreased from 66.2 s−1 to 4.3 s−1 as the palladium loading increased from 0.5 wt % to 10 wt %, which suggested changes in the catalytic properties when palladium nanoparticles were formed simultaneously in the support matrices by FSP method. For both preparation methods, the palladium particle sizes remained unaltered after liquid-phase hydrogenation reaction. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8012055