教授 博士生导师 硕士生导师
性别: 男
毕业院校: 大连理工大学
学位: 博士
所在单位: 化工学院
学科: 工业催化. 物理化学
办公地点: 大连理工大学 西部校区 化工实验楼B521
联系方式: 0411-84986120
电子邮箱: hongchenguo@dlut.edu.cn
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论文类型: 期刊论文
发表时间: 2012-04-01
发表刊物: JOURNAL OF CATALYSIS
收录刊物: SCIE、EI
卷号: 288
页面范围: 1-7
ISSN号: 0021-9517
关键字: TS-1; Amorphous Ti species; UV Raman spectroscopy; Resonance enhancement; Hammett indicator titration; Sulfosalt inactivation
摘要: The nature of the amorphous Ti species in titanium silicalite-1 (TS-1) was investigated by UV Raman spectroscopy (UV Raman), UV-vis diffuse reflectance spectroscopy (UVDRS), infrared spectroscopy (IR), and Hammett indicator titration methods. A new Raman feature at 700 cm(-1), which is closely related to the UVDRS band at 260-280 nm, is first assigned to a totally symmetric vibration of hexacoordinated Ti-O-Ti linkages of the amorphous Ti species. The amorphous Ti species in TS-1 can be formed easily under the synthesis conditions in the presence of Na+ or after treatment in ammonia solution. The results reveal that the amorphous Ti species is the main factor in the enhanced acidity and H2O2 decomposition ability of TS-1. A sulfosalt impregnation method has been proved effective in reducing the adverse effect of the amorphous Ti species. (C) 2011 Elsevier Inc. All rights reserved.