催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (10): 841-843.

• 研究快讯 •    下一篇

纳米Fe2O3-K2O催化剂的制备及其催化乙苯脱氢性能

相彬,徐恒泳,李文钊   

  1. 中国科学院大连化学物理研究所, 辽宁大连 116023
  • 收稿日期:2007-10-25 出版日期:2007-10-25 发布日期:2011-10-28

Highly Efficient Nano-sized Fe2O3-K2O Catalyst for Dehydrogenation of Ethylbenzene to Styrene

XIANG Bin, XU Hengyong*, LI Wenzhao   

  1. Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2007-10-25 Online:2007-10-25 Published:2011-10-28

PDF

991

被引次数

18

摘要： 采用浸渍-热分解法制备了纳米Fe2O3-K2O催化剂,并在常压和520～580 ℃的条件下,考察了其对乙苯催化脱氢反应的催化性能. 结果发现,纳米Fe2O3-K2O催化剂表现出很好的活性和稳定性. 在550 ℃, N2/H2O/乙苯摩尔比为30.7/10/1和WHSV=0.43 h-1的条件下,纳米Fe2O3-K2O催化乙苯脱氢的转化率为71.9%, 苯乙烯选择性为91.1%. 透射电子显微镜和X射线衍射测试结果表明,氧化铁的粒径为10～14 nm. 催化剂的尖晶石结构和高比表面积是其表现出高催化性能的主要原因.

关键词: 氧化铁, 氧化钾, 纳米催化剂, 乙苯, 脱氢, 苯乙烯

Abstract: A nano-sized Fe2O3-K2O catalyst was prepared by the impregnation-thermal decomposition method and was evaluated in the ethylbenzene dehydrogenation at 520-580 ℃ under normal pressure. An ethylbenzene conversion of 71.9% with a styrene selectivity of 91.1% was obtained at 550 ℃, N2/H2O/ethylbenzene molar ratio of 30.7/10/1, and WHSV of 0.43 h-1. Transmission electron microscopy andX-raydiffraction results indicated that Fe2O3 nanoparticles in the Fe2O3-K2O catalyst are well distributed with diameters of 10-14 nm. The large number of active sites in the spinel phase of the catalyst is responsible for the high catalytic activity.

Key words: iron oxide, potassium oxide, nano-sized catalyst, ethylbenzene, dehydrogenation, styrene