添加非金属元素Si对固体超强酸SO_4^(2-)/TiO_2的改性研究  

STUDIES ON SOLID SUPERACID SO 2- 4/TiO 2 MODIFIED BY ADDING Si

作　　者：雷依庆[1,2] 雷霆 张钰 何瑞德[1,2] 

机构地区：[1]太原工业大学精细化工研究所 [2]中国科学院山西煤炭化学研究所

出　　处：《燃料化学学报》1997年第1期21-25,共5页Journal of Fuel Chemistry and Technology

摘　　要：采用共沉淀法引入Ｓｉ对ＳＯ２－４／ＴｉＯ２进行改性，制得了ＳＯ２－４／Ｔｉ－Ｓｉ－Ｏ系列固体超强酸，试样经ＩＲ、ＳＥＭ、ＸＲＤ表征和低温正戊烷异构化活性测试，发现超强酸中心是硫酸根离子与金属原子Ｔｉ结合形成的双配位螯合结构，在超强酸性的样品中ＴｉＯ２均呈锐钛矿晶型。引入Ｓｉ仅迟滞ＴｉＯ２晶化过程，控制Ｓｉ在ＳＯ２－４／Ｔｉ－Ｓｉ－Ｏ体系中的含量可以有效调节固体超强酸的酸性，并提高正戊烷异构化反应的选择性。In order to modify the sueracidity Of speracid SO 2- 4/TiO 2 ,a series of SO 2- 4/Ti-Si-O solid superacids with various molar ratios of Ti/Si were prepared by a coprecipitation method and characterized by FT IR,XRD,SEM The catalytic activities for pentane iso merization at low temperature were also examined It was found that the superacid sites werechelating bidenetate structure produced by SO 2- 4combined with Ti The TiO 2 of samples withsuperacidity was in anatase form,and the presence of Si could inhibit the growth of crys talline phase of TiO 2 in the catalysts The superacidities could be adjusted effectively and theselectivities of pentane isomerization could be improved remarkably by controlling the Si con tents in SO 2- 4/Ti-Si-O catalysts

关 键 词：固体超强酸 正戊烷 异构化 硅 催化剂 改性 

分 类 号：O643.36[理学—物理化学] O621.53[理学—化学]