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学科主题: 物理化学
题名: UV resonance Raman spectroscopic identification of different
作者: Guo Q(郭强) ;  Fan FT(范峰滔) ;  Feng ZC(冯兆池) ;  Li C(李灿)
会议文集: The Program and Abstract Book of the Third Asian Spectroscopy Conference
会议名称: the Third Asian Spectroscopy Conference
会议日期: 2011-11-28
出版日期: 2011
会议地点: 厦门
通讯作者: 李灿
出版者: 待补充
出版地: 待补充
合作性质: 分会口头报告
部门归属: 503
主办者: 厦门大学
摘要: 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.
英文摘要: 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.
语种: 英语
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/116095
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Guo Q,Fan FT,Feng ZC,et al. UV resonance Raman spectroscopic identification of different[C]. 见:the Third Asian Spectroscopy Conference. 厦门. 2011-11-28.
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