Mesoporous Sulfonic Acids as Selective Heterogeneous Catalysts for the Synthesis of Monoglycerides

Bossaert, Wim D.; Vos, Dirk De; Rhijn, Wim M. Van; Bullen, Joren; Grobet, Piet J.; Jacobs, Pierre

doi:10.1006/jcat.1998.2353

Cited by 321 publications

(225 citation statements)

References 28 publications

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“…In all cases, open framework structures have been obtained for compositions in which fewer than 25% of the silicon centers have been functionalized. 10,15,78,79 Ozin and co-workers reported the bifunctionalized periodic mesoporous organosilicas having bridging ethenylene groups in the walls and vinyl groups protruding into the channels. 80 Later, a series of organic functionalities such as amine, thiol, diamine, imidazole, pyridine, and phenyl were incorporated into the channel of mesoporous silica with bridging ethylene groups in the framework using cationic surfactants.…”

Section: Functionalized Periodic Mesoporous Organosilicasmentioning

confidence: 99%

Highly Ordered Mesoporous Organosilica Hybrid Materials

Kapoor¹,

Inagaki²

2006

Bulletin of the Chemical Society of Japan

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The latest developments in periodic mesoporous organosilicas (PMO) have been compiled. The discovery of mesoporous hybrid organosilicas with molecular scale periodicity resulting from alternating hydrophilic and hydrophobic layers, and a cost effective solution showing the use of allyl derivatives of the bis-silyl precursors are discussed. Relevant uses of the periodic mesoporous materials in diverse applications are summarized. For example, the metal-incorporated periodic mesoporous organic frameworks are likely to offer an advantage in catalytic transformations, while the functionalized PMOs show promise in fascinating catalytic applications via enhancing the physical properties of guest molecules and clusters. In general, the advancement in PMOs have showed great promise and are expected to deliver exciting achievable future findings.

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Section: Functionalized Periodic Mesoporous Organosilicasmentioning

confidence: 99%

Highly Ordered Mesoporous Organosilica Hybrid Materials

Kapoor¹,

Inagaki²

2006

Bulletin of the Chemical Society of Japan

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“…Glycerol monoester has been prepared by esterification of fatty acid with glycerol, using acidic solids instead of sulfuric acid [35][36][37][38][39][40][41][42].…”

Section: Strategies For Biomass Conversion Into Bioproducts 61mentioning

confidence: 99%

Process Options for the Catalytic Conversion of Renewables into Bioproducts

Gallezot

2007

Catalysis for Renewables

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“…Sulfonic acid covered NaY zeolite was prepared according to the literature. 10 In typical experiment, before modification, NaY zeolite is calcined at 400 o C for 2 h in order to remove adsorbed water. Calcined NaY zeolite (3 g) is added to a solution of 3-mercatopropyl trimethoxysilane (MPTS, Wako) (0.294 g) dissolved in toluene (20 mL) as the organosulfonic acid precursor.…”

Section: Catalysts Preparationmentioning

confidence: 99%

Phase-boundary catalysts for acid-catalyzed reactions: the role of bimodal amphiphilic structure and location of active sites

Nur¹,

Ikeda²,

Ohtani³

2004

J. Braz. Chem. Soc.

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O potencial catalítico para reações de interface de fases em reações catalisadas por ácidos foi demonstrado pelo zeólito NaY enriquecido com ácido nióbico recoberto por alquilsilano na reação de hidratação do 1,2-epoxioctano com água em fase líquida. O catalisador foi preparado através da impregnação do ácido nióbico na superfície externa de NaY, seguida da modificação parcial da superfície externa de NaY com grupos alquilsilanos. As partículas adicionadas a uma mistura contendo água e 1,2-epoxioctano foram facilmente localizadas na interface das fases líquido-líquido, e catalisaram eficientemente a hidratação do epóxido, mesmo sem agitação. Com o objetivo de investigar o efeito da localização dos sítios ativos, foram preparados HZSM-5 alquilsililado e NaY funcionalizado com ácido sulfônico, em que os sítios ativos estão localizados predominantemente na superfície interna dos zeólitos. Neste caso, foi necessária agitação mecânica para aumentar a velocidade de reação. Sugere-se que a alquisilação da superfície externa do zeólito, quando o sítio ativo se encontra principalmente dentro do poro, não pode modificar o modo de ação do catalisador; ainda é necessário agitar a mistura reacional para promover a transferência de massas de substratos e reagentes.The catalytic potential of phase-boundary catalyst for acid-catalyzed reactions has been demonstrated by NaY zeolite loaded with alkylsilane-covered niobic acid in the liquid phase hydration of 1,2-epoxyoctane with water. The catalyst was prepared by impregnation of niobic acid on the external surface of NaY and followed by a partial modification of the external surface of NaY with alkylsilyl groups. When the particles were added to a mixture of water and 1,2-epoxyoctane, they were feasibly located just at the liquid-liquid phase boundary and efficiently catalyzed hydration of the epoxide even without stirring. In order to investigate the effect of the location of the active sites, alkylsilylated HZSM-5 and sulfonic acid functionalized NaY in which the active sites are located dominantly on the internal surface of zeolites were prepared. In that case, mechanical stirring was needed to increase the reaction rate. It was suggested that alkylsilylation on the external surface of zeolite, when the active site is mainly inside the pore, could not change the mode of the catalytic action; it is still necessary to stir the reaction mixture to drive the mass transfer of substrates and reagents.

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Mesoporous Sulfonic Acids as Selective Heterogeneous Catalysts for the Synthesis of Monoglycerides

Cited by 321 publications

References 28 publications

Highly Ordered Mesoporous Organosilica Hybrid Materials

Highly Ordered Mesoporous Organosilica Hybrid Materials

Process Options for the Catalytic Conversion of Renewables into Bioproducts

Phase-boundary catalysts for acid-catalyzed reactions: the role of bimodal amphiphilic structure and location of active sites

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