文献类型：期刊文献

英文题名：Kinetic Modeling of Acetic Acid Hydrogenation to Ethanol over K-Modified PtSn Catalyst Supported on Alumina

作者：Zhou, Mingchuan[1]; Zhang, Haitao[1]; Ma, Hongfang[1]; Ying, Weiyong[1]

机构：[1] Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2017

卷号：56

期号：31

起止页码：8833

外文期刊名：Industrial and Engineering Chemistry Research

收录：EI(收录号：20173404070756)

语种：英文

外文关键词：Acetic acid - Kinetics - Hydrogenation - Activation energy - Catalysts - Ethanol - Alumina - Aluminum oxide - Binary alloys - Dissociation - pH

摘要：Experiments for acetic acid hydrogenation and catalyst characterizations were conducted to study the kinetics of hydrogenation and esterification over PtSn impregnated on Al2O3 catalyst (PtSn/Al2O3), K doped on PtSn/Al2O3 catalyst (K/PtSn/Al2O3), and PtSn impregnated on K/Al2O3 catalyst (PtSn/K/Al2O3). Kinetic parameters such as activation energy, dissociation enthalpy, and adsorption heat of elementary reaction for hydrogenation and esterification were determined on the basis of Langmuir-Hinshelwood model. After the addition of 0.5 wt % K to PtSn/Al2O3, activation energy of hydrogenation decreased from 20.8 to 11.5 kJ/mol and activation energy of esterification increased from 22.3 to 31.7 kJ/mol. The results of dissociation energy and adsorption heat reflect that K/PtSn/Al2O3 can improve spillover of hydrogen and desorption of ethanol. PtSn/K/Al2O3 had the opposite effect. Potassium also enhanced dissociation of C-OH bond to form more acetyl species. Good agreement was obtained upon comparison of the experimental and calculated data. ? 2017 American Chemical Society.