文献类型：期刊文献

英文题名：Esterification over rare earth oxide and alumina promoted SO42-/ZrO2

作者：Yu, G.X.[1,2]; Zhou, X.L.[2]; Li, C.L.[2]; Chen, L.F.[3]; Wang, J.A.[3]

机构：[1] School of Chemistry and Environmental Engineering, Jianghan University, Wuhan, 430056, China; [2] School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [3] ESIQIE, Instituto Politécnico Nacional, Av. Politécnico S/N, Col. Zacatenco, 07738 Mexico D.F., Mexico

年份：2009

卷号：148

期号：1-2

起止页码：169

外文期刊名：Catalysis Today

收录：EI(收录号：20100412651974)

语种：英文

外文关键词：Rare earths - X ray diffraction - Alumina - Aluminum oxide - Esters - Fourier transform infrared spectroscopy - Esterification - Gas adsorption - Zirconia - pH - Catalyst deactivation - Ethanol

摘要：Solid superacid catalysts including SO42-/ZrO2 (SZ), rare earth (RE) oxide-promoted SZ and RE oxides together with alumina-promoted SZ were prepared. Their catalytic performances in the esterification reaction of ethanol and acetic acid were investigated. The textural property, crystalline phase and surface acidity of the prepared catalysts were characterized by using nitrogen adsorption-desorption isotherms, X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectroscopy of pyridine adsorption techniques, respectively. Effects of the reaction time and catalyst reuse cycle as well as catalyst regeneration on the catalytic behaviors were studied. Experimental results showed that Yb2O3-Al2O3 promoted SZ (designated as SZAY) catalyst exhibited an optimal esterification performance; the Lewis acid sites with moderate and super strong strength could mainly be responsible for the esterification reaction; and doping both Yb2O3 and Al2O3 on SZ not only boosted the esterification activity but also alleviated catalyst deactivation resulted from the surface sulfur loss by solvation. ? 2009 Elsevier B.V. All rights reserved.