Documents disponibles écrits par cet auteur

Calcium-incorporated mesoporous aluminosilicates / Ayyamperumal Sakthivel in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 65–71 Titre : Calcium-incorporated mesoporous aluminosilicates : synthesis, characterization, and applications to the condensation of long-chain fatty acid with long-chain amine and alcohol Type de document : texte imprimé Auteurs : Ayyamperumal Sakthivel, Auteur ; Kenichi Komura, Auteur ; Shing-Jong Huang, Auteur Année de publication : 2010 Article en page(s) : pp. 65–71 Note générale : Indusrtial chemistry Langues : Anglais (eng) Mots-clés : Calcium-Incorporated  Mesoporous  Aluminosilicates:  Synthesis,  Characterization,  and  Applications  to  the  Condensation  of  Long-Chain  Fatty  Acid  with  Long-Chain  Amine  and  Alcohol Résumé : A comprehensive study on a series of highly stable calcium containing mesoporous aluminosilicate molecular sieves (CaAlMMSH) having different acidic properties has been made by varying the Si/Ca ratio in synthesis gels. The structural, physical, and porous properties of these microporous/mesoporous composite materials were characterized by X-ray diffraction, N2 adsorption/desorption isotherm measurements, solid-state 27Al and 29Si magic angle spinning NMR, and variable-temperature hyperpolarized 129Xe NMR, Fourier transform infrared (FTIR) and diffuse reflectance FTIR spectroscopies. As compared to the parent AlMMSH materials, the incorporation of excessive amount of calcium tends to result in an overall increase in acid amount while at the expense of strong acid sites. The CaAlMMSH materials were found to have superior catalytic activities than AlMMSH in the amidation of palmitic acid with N-hexadecylamine. However, no significant enhancement in catalytic activity for the esterification of palmitic acid with cetyl alcohol was observed upon introducing calcium onto the AlMMSH materials. Such discrepancies were ascribed to variations in available acid sties and coking in the two different condensations reaction over the CaAlMMSH materials as catalysts. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900641u [article] Calcium-incorporated mesoporous aluminosilicates : synthesis, characterization, and applications to the condensation of long-chain fatty acid with long-chain amine and alcohol [texte imprimé] / Ayyamperumal Sakthivel, Auteur ; Kenichi Komura, Auteur ; Shing-Jong Huang, Auteur . - 2010 . - pp. 65–71. Indusrtial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 65–71 Mots-clés : Calcium-Incorporated  Mesoporous  Aluminosilicates:  Synthesis,  Characterization,  and  Applications  to  the  Condensation  of  Long-Chain  Fatty  Acid  with  Long-Chain  Amine  and  Alcohol Résumé : A comprehensive study on a series of highly stable calcium containing mesoporous aluminosilicate molecular sieves (CaAlMMSH) having different acidic properties has been made by varying the Si/Ca ratio in synthesis gels. The structural, physical, and porous properties of these microporous/mesoporous composite materials were characterized by X-ray diffraction, N2 adsorption/desorption isotherm measurements, solid-state 27Al and 29Si magic angle spinning NMR, and variable-temperature hyperpolarized 129Xe NMR, Fourier transform infrared (FTIR) and diffuse reflectance FTIR spectroscopies. As compared to the parent AlMMSH materials, the incorporation of excessive amount of calcium tends to result in an overall increase in acid amount while at the expense of strong acid sites. The CaAlMMSH materials were found to have superior catalytic activities than AlMMSH in the amidation of palmitic acid with N-hexadecylamine. However, no significant enhancement in catalytic activity for the esterification of palmitic acid with cetyl alcohol was observed upon introducing calcium onto the AlMMSH materials. Such discrepancies were ascribed to variations in available acid sties and coking in the two different condensations reaction over the CaAlMMSH materials as catalysts. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900641u