高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (12): 1930.

• 论文 • 上一篇    下一篇

SO42--TiO2-Hβ-Al2O3催化剂的制备及催化性能研究

王延吉, 唐靖, 李赫   

  1. 南开大学化学系, 天津, 300071
  • 收稿日期:1994-12-14 修回日期:1995-08-07 出版日期:1995-12-24 发布日期:1995-12-24
  • 通讯作者: 王延吉,男,32岁,博士后.
  • 作者简介:王延吉,男,32岁,博士后.
  • 基金资助:

    中国博士后科学基金

Preparation and Properties of So42--TiO2- Hβ-A2O3Catalyst

WANG Yan-Ji, TANG jing, LI He-Xuan   

  1. Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1994-12-14 Revised:1995-08-07 Online:1995-12-24 Published:1995-12-24

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摘要： 以Hβ沸石为基础,通过TiO2改性及硫酸铵处理制备了SO42--TiO2-Hβ-Al2O3催化剂,并由XRD、XPS、NH3-TPD、FTIR及化学吸附等手段考察了不同焙烧温度对该催化剂表面性质、酸性及催化性能的影响。结果表明:适宜的焙烧温度使SO42--TiO2-Hβ-Al2O3的酸量大幅度增加,强酸比例增大,并产生部分增强酸中心。高强度的酸性中心中,以L酸中心为主;550℃焙烧的样品能使沸石表面上SO42-与TiO2间发生较强的相互作用,高温焙烧则使浓度下降;该催化剂明显促进了丙烯与异丙醇的醚化反应,丙烯转化率由8.0%增高到15.9%.关键词

关键词: &beta, 沸石, SO42--TiO2, 丙烯醚化, 焙烧温度, 增强酸

Abstract: In this paper,So42--TiO2-Hβ-Al2O3solid catalyst was obtained by TiO2modification and(NH4)2SO4treatment of β zeolite. The effect of calcination temperature on the surface composition, acidity and catalytic behavior was observed by XRD, XPS, NH3-TPD,FTIR and chemisorption.The following conclusions were obtained:(1)There was a strong interaction between SO42-and TiO2on the surface of Hβ-Al2O3zeolite at suitable calcination temperature, 550℃.High temperature calcination lowered the surface concentration of (2)Compared to Hβ catalyst,the total number of acid sites and acid strength of TiO2-Hβ-Al2O3were increased greatly, and some increasing acid sites were produced.Lacid sites were predomiant in increasing the number of acid sites.(3)The catalyst showed a high activity on the etherification of propylene and isopropanol to isopropyl ether.With comparison to Hβzeolite catalyst, the propylene conversion was increased from 8.0%to 15.9%and mainly took place on Lacid sites.

Key words: &beta, zeolite, SO42--TiO2, Propylene etherification, Calcination temperature, Increasing acid

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