Role of supports in the tetrapropylammonium hydroxide treated titanium silicalite-1 extrudates

Yi Zuo, Min Liu, Luwei Hong, Mengtong Wu, Ting Zhang, Mengtong Ma, Chunshan Song, Xinwen Guo

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13 Scopus citations

Abstract

Titanium silicalite-1 (TS-1) was extruded with silica and alumina supports, and then the extrudates were treated with dilute tetrapropylammonium hydroxide (TPAOH) solution. The treated TS-1 extrudates were characterized and evaluated in the epoxidation of propene. The two supports exhibited different properties after the treatment. The dissolution of silicon, forming hollows in the TS-1 crystals, preferably occurred when alumina support was used. The inhibition of generation of hollows in the silica supported TS-1 arose from the dissolution and recrystallization of silica support. The crystallization of support also led to the unblocking of inherent micropores, which was beneficial for improving the catalytic performance. Alumina support showed a different result. A very small amount of aluminum was inserted into the framework of TS-1, but the small amount of framework Al caused a sharp increase of the acid amount, and thus a low selectivity of propene oxide and poor catalyst stability in propene epoxidation.

Original languageEnglish (US)
Pages (from-to)1513-1519
Number of pages7
JournalIndustrial and Engineering Chemistry Research
Volume54
Issue number5
DOIs
StatePublished - Feb 11 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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