文献类型：期刊文献

英文题名：Kinetics of Hydrogenolysis of Glycerol to Propylene Glycol over Cu-ZnO-Al₂O₃ Catalysts

作者：Zhou Zhiming[1];Li Xun[2];Zeng Tianying[1];Hong Wenbin[1];Cheng Zhenmin[1];Yuan Weikang[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Changsha Univ Sci & Technol, Sch Chem & Biol Engn, Changsha 410077, Hunan, Peoples R China

年份：2010

卷号：18

期号：3

起止页码：384

外文期刊名：CHINESE JOURNAL OF CHEMICAL ENGINEERING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000279658200005)】；

基金：Supported by the National High Technology Research and Development Program of China (2008AA05Z405), the National Natural Science Foundation of China (20706018) and the Program for Changjiang Scholars and Innovative Research Team in University (IRT0721).

语种：英文

外文关键词：kinetics; hydrogenolysis; glycerol; propylene glycol; catalyst

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.