The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
L. Toniolo - One of the best experts on this subject based on the ideXlab platform.
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Effect of hydride source ( water, hydrogen, p-toluensulfonic) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh3)2(TsO)2 (TsO= p-toluensulfonate anion) catalyst precursor
'Elsevier BV', 2001Co-Authors: A. Vavasori, Cavinato Gianni, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h−1 at 120◦C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 × 10−3 mol l−1, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd–H species or into a Pd–OCH3 species, it is suggested that the first plays a more important role
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Effect of a hydride source (water, hydrogen, p -toluenesulfonic acid) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh 3 ) 2 (TsO) 2 (TsO = p -toluenesulfonate anion) catalyst precursor
Journal of Molecular Catalysis A: Chemical, 2001Co-Authors: A. Vavasori, Gianni Cavinato, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h−1 at 120◦C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 × 10−3 mol l−1, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd–H species or into a Pd–OCH3 species, it is suggested that the first plays a more important role
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Effect of a hydride source (water, hydrogen, p -toluenesulfonic acid) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh 3 ) 2 (TsO) 2 (TsO = p -toluenesulfonate anion) catalyst precursor
Journal of Molecular Catalysis A: Chemical, 2001Co-Authors: A. Vavasori, Gianni Cavinato, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h 121 at 120\u25e6C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 7 10 123 mol l 121, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd\u2013H species or into a Pd\u2013OCH3 species, it is suggested that the first plays a more important role
A. Vavasori - One of the best experts on this subject based on the ideXlab platform.
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Effect of hydride source ( water, hydrogen, p-toluensulfonic) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh3)2(TsO)2 (TsO= p-toluensulfonate anion) catalyst precursor
'Elsevier BV', 2001Co-Authors: A. Vavasori, Cavinato Gianni, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h−1 at 120◦C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 × 10−3 mol l−1, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd–H species or into a Pd–OCH3 species, it is suggested that the first plays a more important role
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Effect of a hydride source (water, hydrogen, p -toluenesulfonic acid) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh 3 ) 2 (TsO) 2 (TsO = p -toluenesulfonate anion) catalyst precursor
Journal of Molecular Catalysis A: Chemical, 2001Co-Authors: A. Vavasori, Gianni Cavinato, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h−1 at 120◦C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 × 10−3 mol l−1, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd–H species or into a Pd–OCH3 species, it is suggested that the first plays a more important role
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Effect of a hydride source (water, hydrogen, p -toluenesulfonic acid) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh 3 ) 2 (TsO) 2 (TsO = p -toluenesulfonate anion) catalyst precursor
Journal of Molecular Catalysis A: Chemical, 2001Co-Authors: A. Vavasori, Gianni Cavinato, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h 121 at 120\u25e6C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 7 10 123 mol l 121, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd\u2013H species or into a Pd\u2013OCH3 species, it is suggested that the first plays a more important role
Suojiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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Lanthanum and Cesium-Loaded SBA-15 Catalysts for MMA Synthesis by Aldol Condensation of Methyl Propionate and Formaldehyde
Catalysis Letters, 2016Co-Authors: Wang Yanan, Lei Wang, Rui Yi Yan, Hui Wang, Suojiang ZhangAbstract:Aldol condensation of Methyl Propionate (MP) and formaldehyde (FA) is a green and sustainable route to synthesize Methyl methacrylate (MMA). In this work, lanthanum and cesium-loaded SBA-15 acid–base bifunctional catalysts for aldol condensation have been prepared by wetness impregnation method to maximize the yield of MMA. With the investigation of the relationship between the properties of catalysts and the catalytic performance, the appropriate acid–base sites for this reaction were provided. The results showed that La existed as LaONO3 on the catalysts and could constitute additional Lewis acid sites on the catalysts. The Cs-0.1La/SBA-15 (with La content of 0.1 %) exhibited higher catalytic activity than the other La-containing catalysts because of the higher density of medium base sites and medium acid sites. The catalysts calcined at 450 °C performed well on this reaction due to the formation of medium base sites on the catalysts as well as the big surface area around 400 m2/g and uniform pore size at 6 nm. When the MP/FA molar ratio was 1/1, the conversion of MP was 29.2 % and the selectivity of MMA could reach 90.4 %.
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SBA-15 Supported Cesium Catalyst for Methyl Methacrylate Synthesis via Condensation of Methyl Propionate with Formaldehyde
Industrial & Engineering Chemistry Research, 2014Co-Authors: Rui Yi Yan, Lei Wang, Yanyan Diao, Suojiang ZhangAbstract:SBA-15 supported metal-doped cesium ion catalysts were prepared by the impregnation method and characterized by N-2 adsorption-desorption, XRD, FT-IR, and SEM and TEM. The characterization results indicated that the ordered hexagonal mesoporous structure of the support remained intact after incorporating cesium. Stepwise TPD of NH3 and CO2 was used to estimate the strength and the number of surface acid and base sites, respectively. The effects of Cs-loading, sources of cesium cation, and template concentration on the physicochemical properties and catalytic performance were investigated. The catalytic performance was evaluated by the gas-phase condensation reaction of Methyl Propionate with formaldehyde in a fixed-bed reactor. Compared with the amorphous SiO2 catalyst, at similar Cs loading (ca. 15 wt %) SBA-15 catalyst exhibited better selectivity and yield.
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synthesis of Methyl methacrylate by aldol condensation of Methyl Propionate with formaldehyde over acid base bifunctional catalysts
Catalysis Letters, 2013Co-Authors: Rui Yi Yan, Lei Wang, Yanyan Diao, Suojiang ZhangAbstract:Supported cesium catalysts with various carriers (SiO2, Al2O3, TiO2, MgO) were prepared and characterized by X-ray diffraction, BET nitrogen adsorption-desorption, NH3 and CO2-TPD methods and thermogravimetric analysis. Experimental results showed that the Zr-Mg-Cs/SiO2 catalyst exhibited moderate activity for aldol condensation of Methyl Propionate with formaldehyde (FA) to produce Methyl methacrylate. Though the activity of Zr-Mg-Cs/SiO2 catalyst decreased with the time-on-stream, the deactivated catalyst was completely regenerated by calcination. The catalyst was regenerated 16 times and total operation time was over 500 h, its activity was identical with that of the fresh catalyst.
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Condensation of Methyl Propionate with Formaldehyde to Methyl Methacrylate over Cs-Zr-Mg/SiO2 Catalysts
Advanced Materials Research, 2011Co-Authors: Shuang Ding, Lei Wang, Rui Yi Yan, Yanyan Diao, Suojiang Zhang, Shao Jun WangAbstract:Cs-Zr-Mg/SiO2 can be effective catalysts for the production of Methyl methacrylate (MMA) by the condensation of Methyl Propionate (MP) and formaldehyde (FA). The catalysts with different magnesium loading were prepared by incipient wetness impregnation. The number and strength of surface acid and base sites of catalysts were determined by stepwise temperature-programmed desorption (TPD) of NH3 and CO2, respectively. It was found that the catalyst with a magnesium loading of 1.0 g/100molSiO2 had the modest acidity and basicity and showed the excellent performance. Furthermore, it was also observed that the activity of the catalyst decreased with reaction time, and coke formed on the catalyst was characterized by DTA/TG technique after reaction.
Yinglong Wang - One of the best experts on this subject based on the ideXlab platform.
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Isobaric Vapor–Liquid Phase Equilibrium Measurements for Allyl Alcohol with Chloroform, Ethyl Acetate, and Methyl Propionate at 101.3 kPa
Journal of Chemical & Engineering Data, 2019Co-Authors: Baotao Diao, Ke Wang, Jun Gao, Lianzheng Zhang, Yinglong WangAbstract:For separation of the azeotrope allyl alcohol and water by azeotropic distillation, chloroform, ethyl acetate, and Methyl Propionate were selected as the azeotropic agents. In this work, the vapor–liquid phase equilibrium (VLE) data for the binary systems (allyl alcohol + chloroform/ethyl acetate/Methyl Propionate) were measured at 101.3 kPa using a modified Rose still. The VLE experimental data were checked by Herington and van Ness methods to verify the thermodynamic consistency. The excess Gibbs energy GE was calculated to evaluate the nonideality for three binary systems. Meanwhile, three thermodynamic models nonrandom two-liquid, universal quasichemical, and Wilson were adopted to correlate the experimental data, and the binary interaction parameters of the three models were regressed. The root-mean-square deviations of vapor composition (y1) and equilibrium temperature (T) are less than 0.0057 and 0.18 K, respectively, which indicates that the experimental data were well correlated by three models.
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isobaric vapor liquid phase equilibrium measurements for allyl alcohol with chloroform ethyl acetate and Methyl Propionate at 101 3 kpa
Journal of Chemical & Engineering Data, 2019Co-Authors: Baotao Diao, Ke Wang, Jun Gao, Lianzheng Zhang, Yinglong WangAbstract:For separation of the azeotrope allyl alcohol and water by azeotropic distillation, chloroform, ethyl acetate, and Methyl Propionate were selected as the azeotropic agents. In this work, the vapor–liquid phase equilibrium (VLE) data for the binary systems (allyl alcohol + chloroform/ethyl acetate/Methyl Propionate) were measured at 101.3 kPa using a modified Rose still. The VLE experimental data were checked by Herington and van Ness methods to verify the thermodynamic consistency. The excess Gibbs energy GE was calculated to evaluate the nonideality for three binary systems. Meanwhile, three thermodynamic models nonrandom two-liquid, universal quasichemical, and Wilson were adopted to correlate the experimental data, and the binary interaction parameters of the three models were regressed. The root-mean-square deviations of vapor composition (y1) and equilibrium temperature (T) are less than 0.0057 and 0.18 K, respectively, which indicates that the experimental data were well correlated by three models.
Gianni Cavinato - One of the best experts on this subject based on the ideXlab platform.
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Effect of a hydride source (water, hydrogen, p -toluenesulfonic acid) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh 3 ) 2 (TsO) 2 (TsO = p -toluenesulfonate anion) catalyst precursor
Journal of Molecular Catalysis A: Chemical, 2001Co-Authors: A. Vavasori, Gianni Cavinato, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h−1 at 120◦C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 × 10−3 mol l−1, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd–H species or into a Pd–OCH3 species, it is suggested that the first plays a more important role
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Effect of a hydride source (water, hydrogen, p -toluenesulfonic acid) on the hydroesterification of ethylene to Methyl Propionate using a Pd(PPh 3 ) 2 (TsO) 2 (TsO = p -toluenesulfonate anion) catalyst precursor
Journal of Molecular Catalysis A: Chemical, 2001Co-Authors: A. Vavasori, Gianni Cavinato, L. TonioloAbstract:Hydroesterification of ethylene to Methyl Propionate has been studied using the catalyst precursor Pd(PPh3)2(TsO)2, which is active in presence of PPh3 and TsOH (TOF = 5700 h 121 at 120\u25e6C, 40 atm (CO/C2H4 = 1/1), Pd/PPh3/TsOH = 1/8/10, [Pd] = 2 7 10 123 mol l 121, solvent methanol, H2O = 800 ppm). In this paper we study the promoting effect of a hydride source, molecular hydrogen, water and p-toluenesulfonic acid (TsOH) and the inhibiting effect of p-benzoquinone. On the basis of experimental evidences, of the two possible initial steps of the catalytic cycle, the insertion of the olefin into a Pd\u2013H species or into a Pd\u2013OCH3 species, it is suggested that the first plays a more important role