高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (7): 1266.

• 论文 • 上一篇    下一篇

纳米TiO2-SiO2复合氧化物的制备与性质

周亚松, 范小虎   

  1. 石油大学重质油加工国家重点实验室, 北京 102200
  • 收稿日期:2002-07-26 出版日期:2003-07-24 发布日期:2003-07-24
  • 通讯作者: 周亚松(1964年出生),男,博士,副教授,主要从事石油化学与加工工艺研究.E-mail:zhys01@bjpeu.edu.cn E-mail:zhys01@bjpeu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:20276040);中国石油股份有限公司(批准号:990801-21-2);中国石油集团公司(批准号:200509-02)资助

Preparation and Properties of the Nanometer Composite Oxide TiO2-SiO2

ZHOU Ya-Song, FAN Xiao-Hu   

  1. State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102200, China
  • Received:2002-07-26 Online:2003-07-24 Published:2003-07-24

摘要: 采用溶胶-凝胶结合CO2超临界干燥方法制备了比表面积大、热稳定性好的纳米TiO2-SiO2复合氧化物.考察了原料组成和焙烧温度对复合氧化物比表面积、热稳定性和酸性的影响,通过加氢脱硫反应考察了该复合氧化物作为加氢精制催化剂载体的可行性.结果表明,采用该方法制备的复合氧化物为纳米颗粒,在n(Ti)/n(Si)=1时,其比表面积和孔容最大;与纯TiO2相比,引入SiO2明显提高了复合氧化物的热稳定性和晶型稳定性;以此复合氧化物为载体的加氢精制催化剂具有很好的低温脱硫活性,TiO2-SiO2复合氧化物载体的酸性特征影响了催化剂的加氢脱硫活性.

关键词: 超临界干燥, 溶胶-凝胶法, TiO2-SiO2, 加氢催化剂

Abstract: In this paper, the nanometer TiO2-SiO2 composite oxide, which has a higher surface area and better thermal stability, was prepared by sol-gel and supercritical CO2 fluid drying method. The effects of feed composition and calcinations temperature on the specific surface area, thermal stability and acidity of the composite oxide were examined. Through hydrodesulfurization(HDS) reactions, the feasibility of the composite oxide as the support of hydrofining catalyst was also examined. The results indicate that nanometer particles of the composite oxide were obtained. When n(Ti)/n(Si) ratio was equal to 1, the specific surface area and pore volume of the composite oxide were maximum. Compared with pure TiO2, the addition of SiO2 obviously improved the thermal stability and crystal stability of the composite oxide. The source of producing Brnsted acid sites was Ti-O-Si bonds, coming from the composite oxide. That the surface of the composite oxide was rich in Ti was conducive to improve the intensity of Lewis acid. The hydrofining catalyst supported on this composite oxide had a better HDS activity at a low temperature. The acidic characteristics of TiO2-SiO2 support has influence on the HDS activity of the catalyst.

Key words: Supercritical fluid drying, Sol-gel method, TiO2-SiO2, Hydrogenation catalyst

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