Highly active and selective nanoalumina-supported wilkinson’s catalysts for hydroformylation of styrene / Peng Li in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1824–1830 Titre : Highly active and selective nanoalumina-supported wilkinson’s catalysts for hydroformylation of styrene Type de document : texte imprimé Auteurs : Peng Li, Auteur ; Warintorn Thitsartarn, Auteur ; Sibudjing Kawi, Auteur Année de publication : 2009 Article en page(s) : pp. 1824–1830 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Nano-Al2O3 particles Polyamidoamine dendrimers Wilkinson’s catalyst Résumé : Uniform nano-Al2O3 particles were functionalized with surface amine ligands to form G0/nano-Al2O3 (where G stands for dendrimer generation) and then grafted with first generation PAMAM (polyamidoamine) dendrimers to form G1/nano-Al2O3. G0/nano-Al2O3 and G1/nano-Al2O3 were used to tether Wilkinson’s catalyst (RhCl(PPh3)3) to produce heterogenized rhodium complex catalysts, named respectively as Rh/G0/nano-Al2O3 and Rh/G1/nano-Al2O3. Both Rh/G0/nano-Al2O3 and Rh/G1/nano-Al2O3 catalysts show much higher activity and selectivity for hydroformylation of styrene than RhCl(PPh3)3 anchored on supports such as α-Al2O3, γ-Al2O3, and SBA-15. An increase of regioselectivity was observed from Rh/G0/nano-Al2O3 to Rh/G1/nano-Al2O3, showing the positive dendrimer effect on promoting the selectivity of styrene hydroformylation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800715k [article] Highly active and selective nanoalumina-supported wilkinson’s catalysts for hydroformylation of styrene [texte imprimé] / Peng Li, Auteur ; Warintorn Thitsartarn, Auteur ; Sibudjing Kawi, Auteur . - 2009 . - pp. 1824–1830. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1824–1830 Mots-clés : Nano-Al2O3 particles Polyamidoamine dendrimers Wilkinson’s catalyst Résumé : Uniform nano-Al2O3 particles were functionalized with surface amine ligands to form G0/nano-Al2O3 (where G stands for dendrimer generation) and then grafted with first generation PAMAM (polyamidoamine) dendrimers to form G1/nano-Al2O3. G0/nano-Al2O3 and G1/nano-Al2O3 were used to tether Wilkinson’s catalyst (RhCl(PPh3)3) to produce heterogenized rhodium complex catalysts, named respectively as Rh/G0/nano-Al2O3 and Rh/G1/nano-Al2O3. Both Rh/G0/nano-Al2O3 and Rh/G1/nano-Al2O3 catalysts show much higher activity and selectivity for hydroformylation of styrene than RhCl(PPh3)3 anchored on supports such as α-Al2O3, γ-Al2O3, and SBA-15. An increase of regioselectivity was observed from Rh/G0/nano-Al2O3 to Rh/G1/nano-Al2O3, showing the positive dendrimer effect on promoting the selectivity of styrene hydroformylation. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800715k

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Transesterification of oil by sulfated Zr-supported mesoporous silica / Warintorn Thitsartarn in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7857–7865 Titre : Transesterification of oil by sulfated Zr-supported mesoporous silica Type de document : texte imprimé Auteurs : Warintorn Thitsartarn, Auteur ; Sibudjing Kawi, Auteur Année de publication : 2011 Article en page(s) : pp. 7857–7865 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Industrial organic Chemicals Leather Fats Waxes Résumé : Highly dispersed sulfated zirconia has been successfully supported on SBA-15 using a postsynthesis method (P-SZS) and compared with conventional sulfated zirconia (SZ) in terms of catalytic activity in the transesterification of palm oil. The synthesized catalysts were characterized by XRD, TEM, NH3 TPD, and N2 adsorption–desorption measurements. The P-SZS catalysts could retain the ordered mesoporous hexagonal structure even at very high Zr loadings, and they had higher acidities (i.e., higher amounts of acid sites and higher acid strengths) than SZ because of the interaction of the highly dispersed sulfated zirconia with the large surface area of SBA-15. As a result, P-SZS catalysts have higher catalytic activities than SZ catalyst for the transesterification of palm oil with methanol. A series of P-SZS catalysts with varying amounts of sulfated zirconia were synthesized. P-SZS-1, which had the highest amount of supported sulfated zirconia, showed the best catalytic performance for transesterification reaction. The activity and stability of P-SZS-1 catalyst could be maintained, as the used P-SZS-1 catalyst could be regenerated simply by resulfation of the catalytic sites without the destruction of the ordered mesoporous structure. Interestingly, P-SZS-1 catalyst could be recycled and reused for at least five cycles without significant decrease in activity and stability. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1022817 [article] Transesterification of oil by sulfated Zr-supported mesoporous silica [texte imprimé] / Warintorn Thitsartarn, Auteur ; Sibudjing Kawi, Auteur . - 2011 . - pp. 7857–7865. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7857–7865 Mots-clés : Industrial organic Chemicals Leather Fats Waxes Résumé : Highly dispersed sulfated zirconia has been successfully supported on SBA-15 using a postsynthesis method (P-SZS) and compared with conventional sulfated zirconia (SZ) in terms of catalytic activity in the transesterification of palm oil. The synthesized catalysts were characterized by XRD, TEM, NH3 TPD, and N2 adsorption–desorption measurements. The P-SZS catalysts could retain the ordered mesoporous hexagonal structure even at very high Zr loadings, and they had higher acidities (i.e., higher amounts of acid sites and higher acid strengths) than SZ because of the interaction of the highly dispersed sulfated zirconia with the large surface area of SBA-15. As a result, P-SZS catalysts have higher catalytic activities than SZ catalyst for the transesterification of palm oil with methanol. A series of P-SZS catalysts with varying amounts of sulfated zirconia were synthesized. P-SZS-1, which had the highest amount of supported sulfated zirconia, showed the best catalytic performance for transesterification reaction. The activity and stability of P-SZS-1 catalyst could be maintained, as the used P-SZS-1 catalyst could be regenerated simply by resulfation of the catalytic sites without the destruction of the ordered mesoporous structure. Interestingly, P-SZS-1 catalyst could be recycled and reused for at least five cycles without significant decrease in activity and stability. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1022817

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