The Experts below are selected from a list of 100851 Experts worldwide ranked by ideXlab platform
George A. Olah - One of the best experts on this subject based on the ideXlab platform.
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Nafion–Fe: A New Efficient “Green” Lewis Acid Catalyst for the Ketonic Strecker Reaction
Catalysis Letters, 2013Co-Authors: G. K. Surya Prakash, Thomas Mathew, Inessa Bychinskaya, Eric R. Marinez, George A. OlahAbstract:The synthesis of various α-aminonitriles, precursors of α-amino Acids has been carried out in moderate to high yields and high purity by the Strecker reaction from ketones, aliphatic/aromatic amines and TMSCN using a new “green” Lewis Acid Catalyst, Nafion–Fe (iron Nafionate, Fe(III) salt of Nafion–H, a solid polymeric perfluoroalkanesulfonic Acid) under conventional thermal as well as microwave conditions. Microwave and solvent-free conditions applied in this method shorten the reaction times, improve the yields and diminishes the formation of side products. Strecker reaction occurs smoothly with secondary aliphatic amines also under these conditions which is not common under conventional conditions. Graphical Abstract
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PVP-SO2 complex as a solid mild Acid Catalyst for efficient one pot, three component, Strecker synthesis of α−aminonitriles
Catalysis Letters, 2007Co-Authors: George A. Olah, Thomas Mathew, Chiradeep Panja, Kiah Smith, G. K. Surya PrakashAbstract:Solid poly(4-vinylpyridine)-SO2 complex was prepared and used as a mild solid Acid Catalyst for simple and efficient three component Strecker synthesis of α-aminonitriles in high yield and purity.
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PVP-SO_2 complex as a solid mild Acid Catalyst for efficient one pot, three component, Strecker synthesis of α−aminonitriles
Catalysis Letters, 2007Co-Authors: George A. Olah, Thomas Mathew, Chiradeep Panja, Kiah Smith, G. K. Surya PrakashAbstract:Solid poly(4-vinylpyridine)-SO_2 complex was prepared and used as a mild solid Acid Catalyst for simple and efficient three component Strecker synthesis of α-aminonitriles in high yield and purity.
G. K. Surya Prakash - One of the best experts on this subject based on the ideXlab platform.
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Nafion–Fe: A New Efficient “Green” Lewis Acid Catalyst for the Ketonic Strecker Reaction
Catalysis Letters, 2013Co-Authors: G. K. Surya Prakash, Thomas Mathew, Inessa Bychinskaya, Eric R. Marinez, George A. OlahAbstract:The synthesis of various α-aminonitriles, precursors of α-amino Acids has been carried out in moderate to high yields and high purity by the Strecker reaction from ketones, aliphatic/aromatic amines and TMSCN using a new “green” Lewis Acid Catalyst, Nafion–Fe (iron Nafionate, Fe(III) salt of Nafion–H, a solid polymeric perfluoroalkanesulfonic Acid) under conventional thermal as well as microwave conditions. Microwave and solvent-free conditions applied in this method shorten the reaction times, improve the yields and diminishes the formation of side products. Strecker reaction occurs smoothly with secondary aliphatic amines also under these conditions which is not common under conventional conditions. Graphical Abstract
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PVP-SO_2 complex as a solid mild Acid Catalyst for efficient one pot, three component, Strecker synthesis of α−aminonitriles
Catalysis Letters, 2007Co-Authors: George A. Olah, Thomas Mathew, Chiradeep Panja, Kiah Smith, G. K. Surya PrakashAbstract:Solid poly(4-vinylpyridine)-SO_2 complex was prepared and used as a mild solid Acid Catalyst for simple and efficient three component Strecker synthesis of α-aminonitriles in high yield and purity.
Fengbao Zhang - One of the best experts on this subject based on the ideXlab platform.
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sulfonated graphene as water tolerant solid Acid Catalyst
Chemical Science, 2011Co-Authors: Junyi Ji, Guanghui Zhang, Hongyu Chen, Shulan Wang, Guoliang Zhang, Fengbao ZhangAbstract:Acid Catalysts are essential for various chemical reactions in the industrial hydrocarbon chemistry. Sulfonated carbon has shown promising application as a new, cheap and environmentally friendly solid Acid Catalyst. In this study, we prepared the sulfonated graphene Acid Catalyst, and it was characterized by electron microscopy, Raman spectroscopy, solid state 13C MAS NMR, energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Catalytic hydrolysis of ethyl acetate shows that the sulfonated graphene has highly catalytic activity and can be repetitively used as a water-tolerant solid Acid Catalyst.
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Sulfonated graphene as water-tolerant solid Acid Catalyst
Chemical Science, 2011Co-Authors: Guanghui Zhang, Hongyu Chen, Shulan Wang, Guoliang Zhang, Fengbao Zhang, Xiaobin FanAbstract:Acid Catalysts are essential for various chemical reactions in the industrial hydrocarbon chemistry. Sulfonated carbon has shown promising application as a new, cheap and environmentally friendly solid Acid Catalyst. In this study, we prepared the sulfonated graphene Acid Catalyst, and it was characterized by electron microscopy, Raman spectroscopy, solid state 13C MAS NMR, energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Catalytic hydrolysis of ethyl acetate shows that the sulfonated graphene has highly catalytic activity and can be repetitively used as a water-tolerant solid Acid Catalyst.
Thomas Mathew - One of the best experts on this subject based on the ideXlab platform.
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Nafion–Fe: A New Efficient “Green” Lewis Acid Catalyst for the Ketonic Strecker Reaction
Catalysis Letters, 2013Co-Authors: G. K. Surya Prakash, Thomas Mathew, Inessa Bychinskaya, Eric R. Marinez, George A. OlahAbstract:The synthesis of various α-aminonitriles, precursors of α-amino Acids has been carried out in moderate to high yields and high purity by the Strecker reaction from ketones, aliphatic/aromatic amines and TMSCN using a new “green” Lewis Acid Catalyst, Nafion–Fe (iron Nafionate, Fe(III) salt of Nafion–H, a solid polymeric perfluoroalkanesulfonic Acid) under conventional thermal as well as microwave conditions. Microwave and solvent-free conditions applied in this method shorten the reaction times, improve the yields and diminishes the formation of side products. Strecker reaction occurs smoothly with secondary aliphatic amines also under these conditions which is not common under conventional conditions. Graphical Abstract
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PVP-SO2 complex as a solid mild Acid Catalyst for efficient one pot, three component, Strecker synthesis of α−aminonitriles
Catalysis Letters, 2007Co-Authors: George A. Olah, Thomas Mathew, Chiradeep Panja, Kiah Smith, G. K. Surya PrakashAbstract:Solid poly(4-vinylpyridine)-SO2 complex was prepared and used as a mild solid Acid Catalyst for simple and efficient three component Strecker synthesis of α-aminonitriles in high yield and purity.
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PVP-SO_2 complex as a solid mild Acid Catalyst for efficient one pot, three component, Strecker synthesis of α−aminonitriles
Catalysis Letters, 2007Co-Authors: George A. Olah, Thomas Mathew, Chiradeep Panja, Kiah Smith, G. K. Surya PrakashAbstract:Solid poly(4-vinylpyridine)-SO_2 complex was prepared and used as a mild solid Acid Catalyst for simple and efficient three component Strecker synthesis of α-aminonitriles in high yield and purity.
Mohamed Kheireddine Aroua - One of the best experts on this subject based on the ideXlab platform.
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Esterification of Glycerol With Oleic Acid Over Hydrophobic Zirconia-Silica Acid Catalyst and Commercial Acid Catalyst: Optimization and Influence of Catalyst Acidity
Frontiers in Chemistry, 2019Co-Authors: Pei San Kong, Patrick Cognet, Yolande Peres-lucchese, Wan Mohd Ashri Wan Daud, Mohamed Kheireddine ArouaAbstract:Catalytic esterification of glycerol with oleic Acid (OA) was optimized over hydrophobic mesoporous zirconia-silica heterogeneous Acid Catalyst (ZrO2-SiO2-Me&Et-PhSO3H) and benchmarked with commercial Catalysts (Aquivion and Amberlyst 15) in order to examine the effect of Catalyst Acidity on conversion, yield and product selectivity. The process optimisation results showed an 80% conversion with a 59.4% glycerol mono-oleate (GMO) and 34.6% glycerol dioleate (GDO) selectivities corresponding to a combined GMO and GDO selectivity of 94.8% at equimolar OA-to-glycerol ratio, 160°C reaction temperature, 5 wt% Catalyst concentration with respect to the OA weight and 4 h reaction time. This work reveals that the hydrophobic and mild Acidic ZrO2-SiO2-Me&Et-PhSO3H Catalyst outperformed Amberlyst 15 and Aquivion with a yield of 82% and GMO selectivity of 60%. It is found that Catalyst Acidity is a key parameter for catalytic activity and conversion rate. Nevertheless, high Acidity/Acid strength reduced the product yield in the glycerol esterification of OA.
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Development of a Novel Hydrophobic ZrO2–SiO2 Based Acid Catalyst for Catalytic Esterification of Glycerol with Oleic Acid
Industrial and engineering chemistry research, 2018Co-Authors: Pei San Kong, Patrick Cognet, Yolande Peres-lucchese, Jérôme Esvan, Wan Mohd Ashri Wan Daud, Mohamed Kheireddine ArouaAbstract:The inevitably low value of glycerol has led to extensive investigations on glycerol conversion to value-added derivatives. The esterification of glycerol with oleic Acid is currently a very important industrial process. In this work, a novel heterogeneous Acid Catalyst featuring hydrophobic surface is developed on modified ZrO2–SiO2 support as water-tolerant solid Acid Catalyst is vital for biphasic esterification reactions that produce water. The novel ZrO2–SiO2–Me&Et-PhSO3H Catalyst was prepared through silication and surface modification with trimethoxymethylsilane and 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane. This work showed that it is possible to control the Acidity and hydrophobicity of the Catalyst by tailoring the amount of surface modification agents. It was found that the hydrophobicity of the Catalyst decreased as its Acidity increased. Furthermore, at constant Catalyst Acidity, the more hydrophobic Catalyst showed a better yield.