DICP OpenIR
Subject Area物理化学
UV resonance Raman spectroscopic identification of different
Guo Q(郭强); Fan FT(范峰滔); Feng ZC(冯兆池); Li C(李灿)
Source PublicationThe Program and Abstract Book of the Third Asian Spectroscopy Conference
Conference Namethe Third Asian Spectroscopy Conference
Conference Date2011-11-28
2011
Conference Place厦门
Pages136-0
Publisher待补充
Publication Place待补充
Cooperation Status分会口头报告
Department503
Funding Organization厦门大学
AbstractTS-1 is an active and selective catalyst in a number of oxidation reactions with H2O2 under mild conditions. Generally, the tetrahedral titanium in the framework of TS-1 are thought to be the active sites for selective oxidation[1]. In this work, UV resonance Raman spectroscopy was used to study the different titanium species in TS-1 synthesized under different conditions. Figure 1 shows the Raman spectra of TS-1 synthesized at different pH values excited with 266 nm (A)and 244 nm laser(B). Besides the Raman bands of zeolite framework at 290 cm-1, 380 cm-1,800 cm-1, the spectra also show Raman bands at 490 cm-1, 530 cm-1, 960 cm-1 and 1125 cm-1which arise from the framework Ti-O-Si species. With lowering of the pH value of the synthsis gel, a new Raman band at 695 cm-1 appeared and became stronger. At the same time,the Raman band at 1125 cm-1 which come from the framework titanium increased obviously. The results demonstrate that the titanium species in TS-1 are different when the pH value of the synthsis gel was changed. The different titanium species may play distinctive roles during the catalytic reactions. Highly active and selective TS-1 could be synthesized if the titanium species were controlled uniformly according to different reactions.; TS-1 is an active and selective catalyst in a number of oxidation reactions with H2O2 under mild conditions. Generally, the tetrahedral titanium in the framework of TS-1 are thought to be the active sites for selective oxidation[1]. In this work, UV resonance Raman spectroscopy was used to study the different titanium species in TS-1 synthesized under different conditions. Figure 1 shows the Raman spectra of TS-1 synthesized at different pH values excited with 266 nm (A)and 244 nm laser(B). Besides the Raman bands of zeolite framework at 290 cm-1, 380 cm-1,800 cm-1, the spectra also show Raman bands at 490 cm-1, 530 cm-1, 960 cm-1 and 1125 cm-1which arise from the framework Ti-O-Si species. With lowering of the pH value of the synthsis gel, a new Raman band at 695 cm-1 appeared and became stronger. At the same time,the Raman band at 1125 cm-1 which come from the framework titanium increased obviously. The results demonstrate that the titanium species in TS-1 are different when the pH value of the synthsis gel was changed. The different titanium species may play distinctive roles during the catalytic reactions. Highly active and selective TS-1 could be synthesized if the titanium species were controlled uniformly according to different reactions.
Language英语
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/116095
Collection中国科学院大连化学物理研究所
Corresponding AuthorLi C(李灿)
Recommended Citation
GB/T 7714
Guo Q,Fan FT,Feng ZC,et al. UV resonance Raman spectroscopic identification of different[C]. 待补充:待补充,2011:136-0.
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