| Cu-ZnO-Al_2O_3催化剂上甘油氢解制1,2-丙二醇的反应动力学(英文) |
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| 引用本文： | 周志明,李浔,曾天鹰,洪闻彬,程振民,袁渭康. Cu-ZnO-Al_2O_3催化剂上甘油氢解制1,2-丙二醇的反应动力学(英文)[J]. 中国化学工程学报, 2010, 18(3): 384-390 |
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| 作者姓名： | 周志明 李浔 曾天鹰 洪闻彬 程振民 袁渭康 |
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| 作者单位： | 1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;2. School of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha 410077, China |
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| 基金项目： | the National High Technology Research and Development Program of China，the National Natural Science Foundation of China，the Program for Changjnang Scholars and Innovative Research Team in University |
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| 摘 要： | A series of Cu-ZnO-Al2O3 catalysts with various metal compositions of Cu/Zn/Al were prepared by the co-precipitation method,and screened for glycerol hydrogenolysis to propylene glycol.The catalyst with a Cu/Zn/Al molar ratio of 1:1:0.5 exhibited the best performance for glycerol hydrogenolysis,and thus selected for kinetic investigation.Under elimination of external and internal diffusion limitation,kinetic experiments were performed in an isothermal fixed-bed reactor at a hydrogen pressure range of 3.0-5.0 MPa and a temperature range of 493-513 K. Based on a dehydration-hydrogenation two-step hydrogenolysis mechanism,a two-site Langmuir-Hinshelwood kinetic model taking into account competitive adsorption of glycerol,acetol and propylene glycol was proposed and successfully fitted to the experimental data.The average relative errors between observed and predicted outlet concentrations of glycerol and propylene glycol were 6.3%and 7.6%,respectively.The kinetic and adsorption parameters were estimated by using the fourth-order Runge-Kutta method together with the Rosenbrock algorithm.The activation energies for dehydration and hydrogenation reactions were 86.56 and 57.80 kJ·mol-1,respectively.
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| 关 键 词： | kinetics hydrogenolysis glycerol propylene glycol catalyst |
| 收稿时间： | 2009-12-09 |
| 修稿时间： | 2009-12-9 |
Kinetics of hydrogenolysis of glycerol to propylene glycol over Cu-ZnO-Al2O3 catalysts |
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| ZHOU Zhiming,LI Xun,ZENG Tianying,HONG Wenbin,CHENG Zhenmin,YUAN Weikang. Kinetics of hydrogenolysis of glycerol to propylene glycol over Cu-ZnO-Al2O3 catalysts[J]. Chinese Journal of Chemical Engineering, 2010, 18(3): 384-390 |
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| Authors: | ZHOU Zhiming LI Xun ZENG Tianying HONG Wenbin CHENG Zhenmin YUAN Weikang |
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| Affiliation: | State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | A series of Cu-ZnO-Al2O3 catalysts with various metal compositions of Cu/Zn/Al were prepared by the co-precipitation method, and screened for glycerol hydrogenolysis to propylene glycol. The catalyst with a Cu/Zn/Al molar ratio of 1:1:0.5 exhibited the best performance for glycerol hydrogenolysis, and thus selected for kinetic investigation. Under elimination of external and internal diffusion limitation, kinetic experiments were performed in an isothermal fixed-bed reactor at a hydrogen pressure range of 3.0-5.0 MPa and a temperature range of 493-513 K.Based on a dehydration-hydrogenation two-step hydrogenolysis mechanism, a two-site Langmuir-Hinshelwood kinetic model taking into account competitive adsorption of glycerol, acetol and propylene glycol was proposed and successfully fitted to the experimental data. The average relative errors between observed and predicted outlet concentrations of glycerol and propylene glycol were 6.3% and 7.6%, respectively. The kinetic and adsorption parameters were estimated by using the fourth-order Runge-Kutta method together with the Rosenbrock algorithm. The ac |
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| Keywords: | kinetics hydrogenolysis glycerol propylene glycol catalyst |
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