A thorough investigation of the active titanium species in TS-1 zeolite by in situ UV resonance raman spectroscopy

Qiang Guo, Keju Sun, Zhaochi Feng, Guanna Li, Meiling Guo, Fengtao Fan, Can Li

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

A thorough investigation of the active titanium species in TS-1 zeolite was conducted by in situ UV resonance Raman spectroscopy combined with UV/Vis diffuse reflectance spectroscopy, DFT calculations, and epoxidation experiments. A new titanium species was identified with a characteristic Raman band at 695 cm -1 when excited at the 266 nm laser line. It is shown that the newly found titanium species is active in the epoxidation reactions in addition to the tetrahedrally coordinated titanium species. However, the acidity of the new titanium species could catalyze the ring-opening reactions of the epoxy products. It results in a lower selectivity toward the epoxy products relative to that of the tetrahedrally coordinated titanium species. The side reaction can be suppressed by the addition of a weak basic reagent.

Original languageEnglish (US)
Pages (from-to)13854-13860
Number of pages7
JournalChemistry - A European Journal
Volume18
Issue number43
DOIs
StatePublished - Oct 22 2012

Keywords

  • Raman spectroscopy
  • active centers
  • epoxidation
  • titanium
  • zeolites

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