Periodic mesoporous organosilica functionalized sulfonic acids as highly efficient and recyclable catalysts in biodiesel production

Karimi, Babak; Mirzaei, Hamid M.; Mobaraki, Akbar

doi:10.1039/c2cy00444e

Cited by 75 publications

(45 citation statements)

References 70 publications

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“…Methylpropyl sulfonic acid functionalised phenylene-and ethyl-bridged PMOs have been synthesised and tested for the transesterification of sunflower oil, canola oil, corn oil, refined olive oil and olive sludge. 237 These functionalised PMOs gave comparable or better activity than SBA-15-PrSO 3 H under optimised conditions, with the ethyl-bridged PMO showing highest activity with a 98% yield. Water adsorption studies proved that the phenylene-bridged PMO was more hydrophobic than the ethyl-bridged variant, but less active, showing that a balance of hydrophobic versus hydrophilic mesostructural properties are necessary for optimum transesterification.…”

Section: Hydrophobicity Studiesmentioning

confidence: 96%

Heterogeneous catalysis for sustainable biodiesel productionviaesterification and transesterification

et al. 2014

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Concern over the economics of accessing fossil fuel reserves, and widespread acceptance of the anthropogenic origin of rising CO2 emissions and associated climate change from combusting such carbon sources, is driving academic and commercial research into new routes to sustainable fuels to meet the demands of a rapidly rising global population. Here we discuss catalytic esterification and transesterification solutions to the clean synthesis of biodiesel, the most readily implemented and low cost, alternative source of transportation fuels to meet future societal demands.

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Section: Hydrophobicity Studiesmentioning

confidence: 96%

Heterogeneous catalysis for sustainable biodiesel productionviaesterification and transesterification

et al. 2014

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“…Periodic mesoporous organosilica (PMO) form a new class of mesoporous materials which holds great promises for a wide variety of applications such as adsorption, catalysis, drug release studies in simulated biological media, chromatography, and enzyme immobilization . Since the pioneering independent works of Inagaki, Ozin, and Stein in 1999 who first described PMO materials, the size reduction of PMO to the nanoscale has been scarcely reported.…”

mentioning

confidence: 99%

Biodegradable Ethylene‐Bis(Propyl)Disulfide‐Based Periodic Mesoporous Organosilica Nanorods and Nanospheres for Efficient In‐Vitro Drug Delivery

et al. 2014

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Periodic mesoporous organosilica nanorods and nanospheres are synthesized from 1,4-bis(triethoxysilyl)ethylene and bis(3-ethoxysilylpropyl)disulfide. The nanosystems present the long-range order of the hexagonal nanostructure. They are degraded in simulated physiological conditions. The loading and release of doxorubicin with these nanosystems are both pH dependent. These nanoparticles are endocytosed by breast cancer cells and are very efficient for doxorubicin delivery in these cells.

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“…The nitrogen isotherm patterns of mesoporous solid acid 1 and 2 exhibit a sharp H1 hysteresis loop, which is the characteristic pattern for mesoporous materials with a narrow pore size determination (PSD) (Figure S2 and S7, Supporting Information) 3a,b. Conversely, ethane‐bridged PMO‐based sulfonic acid 3 displays an indistinct H2 hysteresis loop, which points to the fact that the structure consists of mesopores with a relatively broad PSD (Figure S16, Supporting Information) 3e. The amount adsorbed at the relative pressure 0.99 was used to estimate the total pore volume 10.…”

Section: Resultsmentioning

confidence: 91%

“…Organosulfonic acid‐functionalized periodic mesoporous organosilicas 3 was synthesized as we described before 3e. In a typical preparation procedure, Pluronic P123 (0.66 g) was dissolved in HCl (70 mL, 2 M ) solution with stirring at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Improving the Selectivity toward Three‐Component Biginelli versus Hantzsch Reactions by Controlling the Catalyst Hydrophobic/Hydrophilic Surface Balance

et al. 2013

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The catalytic activities and selectivities of two kinds of mesoporous solid acids SBA‐15‐PrSO3H 1, SBA‐15‐Ph‐PrSO3H 2, and a periodic mesoporous organosilica (PMO) based solid acid Et‐PMO‐Me‐PrSO3H 3 that comprise different physicochemical surface properties were compared in an environmentally benign one‐pot, three‐component Biginelli reaction of aldehydes, β‐ketoesters and urea or thiourea under solvent‐free conditions. Among these mesoporous solid acid catalysts, 3, which has a hydrophobic/hydrophobic balance in the nanospaces (mesochannels) in which the active sites are located, is found to be a significantly more selective catalytic system in the Biginelli reaction; it produces the corresponding 3,4‐dihydropyrimidin‐2‐one\thione (DHPM) 5 derivatives in good to excellent yields and excellent selectivities. Notably, in the case of conducting the three‐component coupling reaction of benzaldehyde, metylacetoacetate and urea in the presence of 1 result in the generation of a mixture of Hantzsch dihydropyridine 4 (≈37 %) and Biginelli dihydropyrimidinone 5 (≈49 %), whereas the same reaction with 2 (catalyst loading of 1 mol % as well) furnishes the corresponding aldolic product methyl‐2‐benzylidene‐3‐oxobutanoate 6 as the major product (≈80 %) with concomitant formation of small amounts of 5 (<10 %) under essentially the same reaction conditions that are employed with catalyst 3. Water adsorption–desorption analysis of the catalysts is employed to possibly relate the observed selectivity to the difference in physicochemical properties of the materials.

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Periodic mesoporous organosilica functionalized sulfonic acids as highly efficient and recyclable catalysts in biodiesel production

Cited by 75 publications

References 70 publications

Heterogeneous catalysis for sustainable biodiesel productionviaesterification and transesterification

Heterogeneous catalysis for sustainable biodiesel productionviaesterification and transesterification

Biodegradable Ethylene‐Bis(Propyl)Disulfide‐Based Periodic Mesoporous Organosilica Nanorods and Nanospheres for Efficient In‐Vitro Drug Delivery

Improving the Selectivity toward Three‐Component Biginelli versus Hantzsch Reactions by Controlling the Catalyst Hydrophobic/Hydrophilic Surface Balance

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