The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Keiichi Tomishige - One of the best experts on this subject based on the ideXlab platform.
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chemoselective hydrogenolysis of tetrahydropyran 2 methanol to 1 6 Hexanediol over rhenium modified carbon supported rhodium catalysts
Chemcatchem, 2010Co-Authors: Kaiyou Chen, Shuichi Koso, Takeshi Kubota, Yoshinao Nakagawa, Keiichi TomishigeAbstract:Modification of Rh/C with Re species enabled chemoselective hydrogenolysis of tetrahydropyran-2-methanol to 1,6-Hexanediol. In particular, the Rh–ReOx/C (Re/Rh ratio=0.25) catalyst gave a high yield of 1,6-Hexanediol (84 %) and showed a very low activity for overhydrogenolysis to 1-hexanol. Using the same catalyst in the hydrogenolysis of tetrahydrofurfuryl alcohol also gave a high yield of 1,5-pentanediol (94 %). Characterization results indicate the formation of ReOxclusters attached on the surface of Rh metal particles. This can cause the synergy between ReOxand Rh, and the tetrahydropyran-2-methanol hydrogenolysis proceeds on the interface between Rh metal surface and attached ReOxspecies.
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Chemoselective Hydrogenolysis of Tetrahydropyran‐2‐methanol to 1,6‐Hexanediol over Rhenium‐Modified Carbon‐Supported Rhodium Catalysts
ChemCatChem, 2010Co-Authors: Kaiyou Chen, Shuichi Koso, Takeshi Kubota, Yoshinao Nakagawa, Keiichi TomishigeAbstract:Modification of Rh/C with Re species enabled chemoselective hydrogenolysis of tetrahydropyran-2-methanol to 1,6-Hexanediol. In particular, the Rh–ReOx/C (Re/Rh ratio=0.25) catalyst gave a high yield of 1,6-Hexanediol (84 %) and showed a very low activity for overhydrogenolysis to 1-hexanol. Using the same catalyst in the hydrogenolysis of tetrahydrofurfuryl alcohol also gave a high yield of 1,5-pentanediol (94 %). Characterization results indicate the formation of ReOxclusters attached on the surface of Rh metal particles. This can cause the synergy between ReOxand Rh, and the tetrahydropyran-2-methanol hydrogenolysis proceeds on the interface between Rh metal surface and attached ReOxspecies.
Guoji Liu - One of the best experts on this subject based on the ideXlab platform.
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Experimental and correlated liquid-liquid equilibrium data for water + 1,6-Hexanediol + 1-pentanol/3-methyl-1-butanol/2-methyl-2-butanol at different temperatures
The Journal of Chemical Thermodynamics, 2021Co-Authors: Xingchuan Yang, Chunmei Cao, Guoji LiuAbstract:Abstract Liquid-liquid equilibria (LLE) data for ternary systems of water + 1,6-Hexanediol + 1-pentanol/ 3-methyl-1-butanol/ 2-methyl-2-butanol were measured at (293.15, 303.15, 313.15 and 323.15) K under 101.3 kPa. Cloud-point method was applied to determine the solubility curves data. Distribution coefficient and separation factors for 1,6-Hexanediol were calculated from the measured tie-line data to evaluate the extraction effect of alcohols on 1,6-Hexanediol. The reliability of experimental LLE data were tested by Othmer–Tobias equation and Hand equation, NRTL and UNIQUAC models were applied to correlate the measured data and the calculated results show that both models can fit the experimental data very well.
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experimental and correlated liquid liquid equilibrium data for dimethyl adipate 1 6 Hexanediol water or ethylene glycol
Journal of Molecular Liquids, 2019Co-Authors: Xingchuan Yang, Chunmei Cao, Guoji LiuAbstract:Abstract Solubility and liquid-liquid equilibria data for dimethyl adipate +1,6-Hexanediol + water or ethylene glycol ternary systems at T = 313.15K and 323.15K under atmospheric pressure were measured. The distribution coefficient and separation factors were calculated according to the tie-line data and water was considered to be the suitable solvent to extract 1,6-Hexanediol. The Othmer–Tobias and the Bachman equations were used to test the reliability of the experimental data. Besides, the experimental data were correlated with the NRTL and UNIQUAC models. It turned out to be that the calculated results from the two models had good agreement with the experimental data.
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Experimental and correlated liquid-liquid equilibrium data for dimethyl adipate + 1,6-Hexanediol + water or ethylene glycol
Journal of Molecular Liquids, 2019Co-Authors: Xingchuan Yang, Chunmei Cao, Guoji LiuAbstract:Abstract Solubility and liquid-liquid equilibria data for dimethyl adipate +1,6-Hexanediol + water or ethylene glycol ternary systems at T = 313.15K and 323.15K under atmospheric pressure were measured. The distribution coefficient and separation factors were calculated according to the tie-line data and water was considered to be the suitable solvent to extract 1,6-Hexanediol. The Othmer–Tobias and the Bachman equations were used to test the reliability of the experimental data. Besides, the experimental data were correlated with the NRTL and UNIQUAC models. It turned out to be that the calculated results from the two models had good agreement with the experimental data.
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solubility and thermodynamic analysis of 1 6 Hexanediol in methanol dimethyl adipate and n butanol dimethyl adipate binary solvents from 283 15 k to 303 15 k
Journal of Molecular Liquids, 2017Co-Authors: Junwei Zhang, Shuai Yang, Guoji LiuAbstract:Abstract The solubility of 1,6-Hexanediol in (methanol + dimethyl adipate (DMA)), (n-butanol + DMA) binary solvents was measured by the dynamic method under 0.1 MPa. The studies were carried out at different mass fractions of methanol or n-butanol from 283.15 K to 303.15 K. The solubility of 1,6-Hexanediol in binary solvents increases with increasing temperature and mass fraction of methanol or n-butanol. In a fixed temperature and fixed mass fraction of methanol or n-butanol, the solubility of 1,6-Hexanediol in (methanol + DMA) is greater than in (n-butanol + DMA). In addition, the experimental solubility data were correlated by Jouyban–Acree model, Van't Hoff–Jouyban–Acree model, modified Apelblat–Jouyban–Acree model and Sun model, in which the Sun model shows the best agreement with the experimental solubility data. The maximum of relative average deviation (RAD) and the root-mean-square deviation (RMSD) between the experimental and calculated solubility were 5.85 × 10− 2 and 3.80 × 10− 2, respectively. Additionally, the thermodynamic properties (including enthalpy, Gibbs energy and entropy) were also obtained, and the results show that the dissolution of 1,6-Hexanediol in the two binary solvents is an endothermic process.
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Solubility and thermodynamic analysis of 1,6-Hexanediol in (methanol + dimethyl adipate) and (n-butanol + dimethyl adipate) binary solvents from 283.15 K to 303.15 K
Journal of Molecular Liquids, 2017Co-Authors: Junwei Zhang, Shuai Yang, Guoji LiuAbstract:Abstract The solubility of 1,6-Hexanediol in (methanol + dimethyl adipate (DMA)), (n-butanol + DMA) binary solvents was measured by the dynamic method under 0.1 MPa. The studies were carried out at different mass fractions of methanol or n-butanol from 283.15 K to 303.15 K. The solubility of 1,6-Hexanediol in binary solvents increases with increasing temperature and mass fraction of methanol or n-butanol. In a fixed temperature and fixed mass fraction of methanol or n-butanol, the solubility of 1,6-Hexanediol in (methanol + DMA) is greater than in (n-butanol + DMA). In addition, the experimental solubility data were correlated by Jouyban–Acree model, Van't Hoff–Jouyban–Acree model, modified Apelblat–Jouyban–Acree model and Sun model, in which the Sun model shows the best agreement with the experimental solubility data. The maximum of relative average deviation (RAD) and the root-mean-square deviation (RMSD) between the experimental and calculated solubility were 5.85 × 10− 2 and 3.80 × 10− 2, respectively. Additionally, the thermodynamic properties (including enthalpy, Gibbs energy and entropy) were also obtained, and the results show that the dissolution of 1,6-Hexanediol in the two binary solvents is an endothermic process.
Daidi Fan - One of the best experts on this subject based on the ideXlab platform.
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a new solid acid so42 tio2 catalyst modified with tin to synthesize 1 6 Hexanediol diacrylate
Chinese Journal of Catalysis, 2016Co-Authors: Xiaxia Bai, Liuyi Pan, Peng Zhao, Daidi FanAbstract:A new solid acid catalyst, SO 4 2- /TiO 2 modified with tin, was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, infrared spectroscopy of adsorbed pyridine, temperature-programmed desorption of ammonia and thermal gravimetric analysis. The structure, acidity and thermal stability of the SO 4 2- /TiO 2 -SnO 2 catalyst were studied. Incorporating tin enlarged the specific surface area and decreased crystallite size of the SO 4 2- /TiO 2 catalyst. The total acid sites of the modified catalyst increased and Bronsted acid strength remarkably increased with increasing tin content. The decomposition temperature of sulfate radical in the modified catalyst was 100℃ greater and its mass loss was more than twice that of the SO 4 2- /TiO 2 catalyst. The SO 4 2- /TiO 2 -SnO 2 catalyst was designed to synthesize 1,6-Hexanediol diacrylate by esterification of 1,6-Hexanediol with crylic acid. The yield of 1,6-Hexanediol diacrylate exceeded 87% under the optimal reaction conditions: crylic acid to 1,6-Hexanediol molar ratio=3.5, catalyst loading=7%, reaction temperature=130℃ and reaction time=3 h. The modified catalyst exhibited excellent reusability and after 10 cycles the conversion of 1,6-Hexanediol was above 81%.
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A new solid acid SO42−/TiO2 catalyst modified with tin to synthesize 1,6-Hexanediol diacrylate
Chinese Journal of Catalysis, 2016Co-Authors: Xiaxia Bai, Liuyi Pan, Peng Zhao, Daidi FanAbstract:A new solid acid catalyst, SO 4 2- /TiO 2 modified with tin, was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, infrared spectroscopy of adsorbed pyridine, temperature-programmed desorption of ammonia and thermal gravimetric analysis. The structure, acidity and thermal stability of the SO 4 2- /TiO 2 -SnO 2 catalyst were studied. Incorporating tin enlarged the specific surface area and decreased crystallite size of the SO 4 2- /TiO 2 catalyst. The total acid sites of the modified catalyst increased and Bronsted acid strength remarkably increased with increasing tin content. The decomposition temperature of sulfate radical in the modified catalyst was 100℃ greater and its mass loss was more than twice that of the SO 4 2- /TiO 2 catalyst. The SO 4 2- /TiO 2 -SnO 2 catalyst was designed to synthesize 1,6-Hexanediol diacrylate by esterification of 1,6-Hexanediol with crylic acid. The yield of 1,6-Hexanediol diacrylate exceeded 87% under the optimal reaction conditions: crylic acid to 1,6-Hexanediol molar ratio=3.5, catalyst loading=7%, reaction temperature=130℃ and reaction time=3 h. The modified catalyst exhibited excellent reusability and after 10 cycles the conversion of 1,6-Hexanediol was above 81%.
Yoshinao Nakagawa - One of the best experts on this subject based on the ideXlab platform.
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chemoselective hydrogenolysis of tetrahydropyran 2 methanol to 1 6 Hexanediol over rhenium modified carbon supported rhodium catalysts
Chemcatchem, 2010Co-Authors: Kaiyou Chen, Shuichi Koso, Takeshi Kubota, Yoshinao Nakagawa, Keiichi TomishigeAbstract:Modification of Rh/C with Re species enabled chemoselective hydrogenolysis of tetrahydropyran-2-methanol to 1,6-Hexanediol. In particular, the Rh–ReOx/C (Re/Rh ratio=0.25) catalyst gave a high yield of 1,6-Hexanediol (84 %) and showed a very low activity for overhydrogenolysis to 1-hexanol. Using the same catalyst in the hydrogenolysis of tetrahydrofurfuryl alcohol also gave a high yield of 1,5-pentanediol (94 %). Characterization results indicate the formation of ReOxclusters attached on the surface of Rh metal particles. This can cause the synergy between ReOxand Rh, and the tetrahydropyran-2-methanol hydrogenolysis proceeds on the interface between Rh metal surface and attached ReOxspecies.
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Chemoselective Hydrogenolysis of Tetrahydropyran‐2‐methanol to 1,6‐Hexanediol over Rhenium‐Modified Carbon‐Supported Rhodium Catalysts
ChemCatChem, 2010Co-Authors: Kaiyou Chen, Shuichi Koso, Takeshi Kubota, Yoshinao Nakagawa, Keiichi TomishigeAbstract:Modification of Rh/C with Re species enabled chemoselective hydrogenolysis of tetrahydropyran-2-methanol to 1,6-Hexanediol. In particular, the Rh–ReOx/C (Re/Rh ratio=0.25) catalyst gave a high yield of 1,6-Hexanediol (84 %) and showed a very low activity for overhydrogenolysis to 1-hexanol. Using the same catalyst in the hydrogenolysis of tetrahydrofurfuryl alcohol also gave a high yield of 1,5-pentanediol (94 %). Characterization results indicate the formation of ReOxclusters attached on the surface of Rh metal particles. This can cause the synergy between ReOxand Rh, and the tetrahydropyran-2-methanol hydrogenolysis proceeds on the interface between Rh metal surface and attached ReOxspecies.
Xiaxia Bai - One of the best experts on this subject based on the ideXlab platform.
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a new solid acid so42 tio2 catalyst modified with tin to synthesize 1 6 Hexanediol diacrylate
Chinese Journal of Catalysis, 2016Co-Authors: Xiaxia Bai, Liuyi Pan, Peng Zhao, Daidi FanAbstract:A new solid acid catalyst, SO 4 2- /TiO 2 modified with tin, was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, infrared spectroscopy of adsorbed pyridine, temperature-programmed desorption of ammonia and thermal gravimetric analysis. The structure, acidity and thermal stability of the SO 4 2- /TiO 2 -SnO 2 catalyst were studied. Incorporating tin enlarged the specific surface area and decreased crystallite size of the SO 4 2- /TiO 2 catalyst. The total acid sites of the modified catalyst increased and Bronsted acid strength remarkably increased with increasing tin content. The decomposition temperature of sulfate radical in the modified catalyst was 100℃ greater and its mass loss was more than twice that of the SO 4 2- /TiO 2 catalyst. The SO 4 2- /TiO 2 -SnO 2 catalyst was designed to synthesize 1,6-Hexanediol diacrylate by esterification of 1,6-Hexanediol with crylic acid. The yield of 1,6-Hexanediol diacrylate exceeded 87% under the optimal reaction conditions: crylic acid to 1,6-Hexanediol molar ratio=3.5, catalyst loading=7%, reaction temperature=130℃ and reaction time=3 h. The modified catalyst exhibited excellent reusability and after 10 cycles the conversion of 1,6-Hexanediol was above 81%.
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A new solid acid SO42−/TiO2 catalyst modified with tin to synthesize 1,6-Hexanediol diacrylate
Chinese Journal of Catalysis, 2016Co-Authors: Xiaxia Bai, Liuyi Pan, Peng Zhao, Daidi FanAbstract:A new solid acid catalyst, SO 4 2- /TiO 2 modified with tin, was prepared using a sol-gel method and its physicochemical properties were revealed by nitrogen adsorption-desorption, X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, infrared spectroscopy of adsorbed pyridine, temperature-programmed desorption of ammonia and thermal gravimetric analysis. The structure, acidity and thermal stability of the SO 4 2- /TiO 2 -SnO 2 catalyst were studied. Incorporating tin enlarged the specific surface area and decreased crystallite size of the SO 4 2- /TiO 2 catalyst. The total acid sites of the modified catalyst increased and Bronsted acid strength remarkably increased with increasing tin content. The decomposition temperature of sulfate radical in the modified catalyst was 100℃ greater and its mass loss was more than twice that of the SO 4 2- /TiO 2 catalyst. The SO 4 2- /TiO 2 -SnO 2 catalyst was designed to synthesize 1,6-Hexanediol diacrylate by esterification of 1,6-Hexanediol with crylic acid. The yield of 1,6-Hexanediol diacrylate exceeded 87% under the optimal reaction conditions: crylic acid to 1,6-Hexanediol molar ratio=3.5, catalyst loading=7%, reaction temperature=130℃ and reaction time=3 h. The modified catalyst exhibited excellent reusability and after 10 cycles the conversion of 1,6-Hexanediol was above 81%.