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题名: Epoxidation of propylene with dilute H2O2 over titanium silicalite containing trace aluminum
作者: Guo, XW;  Wang, XS;  Liu, M;  Li, G;  Chen, YY;  Xiu, JH;  Zhuang, JQ;  Zhang, WP;  Bao, XH
关键词: titanium silicalites ;  aluminum-containing TS-1 ;  TPABr ;  propylene ;  epoxidation ;  thermal stability ;  acid treatment
刊名: CATALYSIS LETTERS
发表日期: 2002-07-01
卷: 81, 期:1-2, 页:125-130
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Titanium silicalite (TS-1) was successfully synthesized by using TPABr as the template and silica sol as silicon source in a 100 l stainless steel autoclave. IR, XRD, UV--vis, elemental analysis, and (2)7Al and (3)1P MAS NMR were used to characterize the synthesized products. The results show that the synthesized material has an MFI structure with high crystallinity and large crystal size and two kinds of titanium species. Trace aluminum in silica sol is also incorporated into the zeolite framework. The synthesized TS-1 exhibits high activity in the epoxidation of propylene with dilute H2O2 with high selectivity to methyl mono-ethers and low selectivity to propylene oxide (PO). The low selectivity toward PO is due to the residual acidity onto TS-1. The selectivity of PO can reach up to 90% through adjusting the pH of the reaction mixture. Extra amounts of base decrease the H2O2 utilization and the H2O2 conversion. However, in over acid-treated TS-1 in which part removal of extra-framework titanium takes place, the utilization of H2O2 is quite different: for the low Si/Ti ratio of TS-1, the H2O2 utilization increases. But the utilization of H2O2 does not change for the high Si/Ti ratio TS-1. Thermal analysis shows that the as-synthesized TS-1 exhibits high activity and thermal stability in the calcined range 540-900 degreesC.
关键词[WOS]: HYDROGEN-PEROXIDE ;  PROBE MOLECULE ;  ZEOLITES ;  SYSTEMS ;  AL-TS-1 ;  SITES ;  NMR ;  TI ;  AL
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000176481700019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/84879
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116012, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Guo, XW,Wang, XS,Liu, M,et al. Epoxidation of propylene with dilute H2O2 over titanium silicalite containing trace aluminum[J]. CATALYSIS LETTERS,2002,81(1-2):125-130.
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