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Effect of calcination temperature on catalytic hydrolysis of COS over CoNiAl catalysts derived from hydrotalcite precursor / Honghong Yi 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. 13273-13279 Titre : Effect of calcination temperature on catalytic hydrolysis of COS over CoNiAl catalysts derived from hydrotalcite precursor Type de document : texte imprimé Auteurs : Honghong Yi, Auteur ; Hongyan Wang, Auteur ; Xiaolong Tang, Auteur Année de publication : 2012 Article en page(s) : pp. 13273-13279 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Precursor  Catalyst  Hydrolysis  Catalytic  reaction  Calcining Résumé : A series of CoNiAl composite oxide catalysts were prepared by calcining the CoNiAl hydrotalcite-like precursor at various temperatures and used in the catalytic hydrolysis of carbonyl sulfide (COS). The raw CoNiAl precursor and calcined products were characterized by various technologies. The catalyst calcined at 350 °C showed excellent activity and stability for COS hydrolysis at 50 °C and GHSV of 2000 h―1 with temperature of water saturator of 25 °C. The CoNiAl precursor was decomposed at 350 °C to form NiO accompanying spinel phase and hydroxyl groups (OH―), which were active sites of the hydrolysis of COS. With lower calcination temperature, the precursor is incompletely decomposed to form mixed oxides, thereby decreasing the catalyst activity. Increasing the calcination temperature above 350 °C led to severe sintering of NiO and other active components, causing decrease in the number of active sites. The deactivation of catalysts was also investigated. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267483 [article] Effect of calcination temperature on catalytic hydrolysis of COS over CoNiAl catalysts derived from hydrotalcite precursor [texte imprimé] / Honghong Yi, Auteur ; Hongyan Wang, Auteur ; Xiaolong Tang, Auteur . - 2012 . - pp. 13273-13279. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13273-13279 Mots-clés : Precursor  Catalyst  Hydrolysis  Catalytic  reaction  Calcining Résumé : A series of CoNiAl composite oxide catalysts were prepared by calcining the CoNiAl hydrotalcite-like precursor at various temperatures and used in the catalytic hydrolysis of carbonyl sulfide (COS). The raw CoNiAl precursor and calcined products were characterized by various technologies. The catalyst calcined at 350 °C showed excellent activity and stability for COS hydrolysis at 50 °C and GHSV of 2000 h―1 with temperature of water saturator of 25 °C. The CoNiAl precursor was decomposed at 350 °C to form NiO accompanying spinel phase and hydroxyl groups (OH―), which were active sites of the hydrolysis of COS. With lower calcination temperature, the precursor is incompletely decomposed to form mixed oxides, thereby decreasing the catalyst activity. Increasing the calcination temperature above 350 °C led to severe sintering of NiO and other active components, causing decrease in the number of active sites. The deactivation of catalysts was also investigated. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25267483

Silica - supported tin oxides as heterogeneous acid catalysts for transesterification of soybean oil with methanol / Wenlei Xie in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 225-231 Titre : Silica - supported tin oxides as heterogeneous acid catalysts for transesterification of soybean oil with methanol Type de document : texte imprimé Auteurs : Wenlei Xie, Auteur ; Hongyan Wang, Auteur ; Li, Hui, Auteur Année de publication : 2012 Article en page(s) : pp. 225-231 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Transesterification  Acid  catalysis Résumé : In this work, the SnO2/SiO2 materials with various Sn loadings ranging from 1 to 16 wt % were prepared and used as heterogeneous acid catalysts for soybean oil transesterification to produce biodiesel. The catalyst with 8 wt % Sn loading and calcined at 873 K exhibited the best catalytic activity, giving an oil conversion of 81.7%. The dispersed amorphous SnO2 species on the silica surface are considered to be active sites for the transesterification reaction. The effect of reaction parameters such as catalyst amount, reaction temperature, reaction time, and methanol-to-oil ratio was investigated to optimize the transesterification conditions. It is shown that the free fatty acid (FFA) and water have no significant influence on the catalytic activity to the transesterification reaction. In addition, the heterogeneous acid catalyst was found to have high activities toward the esterification of FFAs. Furthermore, the catalyst could be recovered with a better reusability. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476465 [article] Silica - supported tin oxides as heterogeneous acid catalysts for transesterification of soybean oil with methanol [texte imprimé] / Wenlei Xie, Auteur ; Hongyan Wang, Auteur ; Li, Hui, Auteur . - 2012 . - pp. 225-231. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 225-231 Mots-clés : Transesterification  Acid  catalysis Résumé : In this work, the SnO2/SiO2 materials with various Sn loadings ranging from 1 to 16 wt % were prepared and used as heterogeneous acid catalysts for soybean oil transesterification to produce biodiesel. The catalyst with 8 wt % Sn loading and calcined at 873 K exhibited the best catalytic activity, giving an oil conversion of 81.7%. The dispersed amorphous SnO2 species on the silica surface are considered to be active sites for the transesterification reaction. The effect of reaction parameters such as catalyst amount, reaction temperature, reaction time, and methanol-to-oil ratio was investigated to optimize the transesterification conditions. It is shown that the free fatty acid (FFA) and water have no significant influence on the catalytic activity to the transesterification reaction. In addition, the heterogeneous acid catalyst was found to have high activities toward the esterification of FFAs. Furthermore, the catalyst could be recovered with a better reusability. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476465