催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (4): 345-350.

• 研究论文 • 上一篇    下一篇

SnO2-Nb2O5/MgAl2O4/α-Al2O3催化环氧乙烷水合制乙二醇

李应成1,2,闫世润2,杨为民1,谢在库1,陈庆龄1,岳斌2,贺鹤勇2   

  1. 1 中国石油化工股份有限公司上海石油化工研究院, 上海 201208; 2 复旦大学化学系, 上海市分子催化和功能材料重点实验室, 上海 200433
  • 收稿日期:2007-04-25 出版日期:2007-04-25 发布日期:2011-03-28

Hydration of Ethylene Oxide to Ethylene Glycol over SnO2-Nb2O5/MgAl2O4/α-Al2O3 Catalyst

LI Yingcheng1,2*, YAN Shirun2, YANG Weimin1, XIE Zaiku1, CHEN Qingling1, YUE Bin2, HE Heyong2   

  1. 1 Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China; 2 Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, Shanghai 200433, China
  • Received:2007-04-25 Online:2007-04-25 Published:2011-03-28

PDF

696

被引次数

5

摘要： 采用水热稳定的MgAl2O4尖晶石对α-Al2O3载体表面进行修饰,采用具有较强亲水性能的SnO2对活性组分Nb2O5进行修饰,制备了SnO2-Nb2O5/MgAl2O4/α-Al2O3催化剂,并用于环氧乙烷水合制乙二醇反应. 采用X射线衍射、红外光谱和程序升温脱附研究了Sn/Nb摩尔比对催化剂酸性、环氧乙烷在催化剂表面的吸附状态和吸附强度以及催化剂性能的影响. 结果表明, Sn/Nb摩尔比明显影响催化剂的组成和结构; 催化剂的结构不同,环氧乙烷在催化剂表面的吸附强度存在明显差别,催化剂的催化性能明显不同.

关键词: 氧化铌, 氧化铝, 氧化锡, 镁铝尖晶石, 环氧乙烷, 水合, 乙二醇

Abstract: The SnO2-Nb2O5/MgAl2O4/α-Al2O3 catalyst was prepared by modification of α-Al2O3 with MgAl2O4 along with the doping of SnO2 in Nb2O5 and used for hydration of ethylene oxide (EO) to monoethylene glycol (MEG). The effects of Sn/Nb molar ratios on the structure, the acidity and the catalytic performance of the catalyst were investigated by using X-ray diffraction, infrared spectroscopy, temperature-programmed desorption of NH3 and of EO. The phase composition of niobium species, the catalyst acidity, and the adsorption states and strength of EO were markedly influenced by the Sn/Nb molar ratios, leading to different EO conversion and MEG selectivity. MEG selectivity of 95.2% was achieved at n(Sn)/n(Nb)=0.8. The characterization of the used catalyst revealed that no obvious change was recorded, indicating the good hydrothermal stability of the catalyst.

Key words: niobium oxide, alumina, stannic oxide, magnesia-alumina spinel, ethylene oxide, hydration, monoethylene glycol