Mechanistic investigations of the methanol-to-olefin (MTO) process on acidic zeolite catalysts by in situ solid-state NMR spectroscopy

Wei Wang*, Yijiao Jiang, Michael Hunger

*Corresponding author for this work

Research output: Contribution to journalArticle

151 Citations (Scopus)

Abstract

This paper reviews mechanistic investigations of the methanol-to-olefin (MTO) process by in situ solid-state NMR spectroscopy, mainly performed under continuous-flow and stopped-flow conditions. During methanol conversion on the silicoaluminophosphate H-SAPO-34 under continuous-flow conditions, a hydrocarbon-pool consisting of a mixture of C6-C12 olefins and aromatics was found. The hydrocarbon-pool mechanism was verified as the dominating route in the MTO process under steady-state conditions. By in situ MAS NMR experiments under continuous-flow conditions it could be demonstrated that methanol molecules are added to the hydrocarbon-pool and light olefins are split off as reaction products. The reactivity of surface methoxy groups in the MTO process were evidenced by the reaction with different probe molecules. By the new developed in situ MAS NMR-UV/vis technique, the initial formation of the hydrocarbon-pool during the induction period was investigated.

Original languageEnglish
Pages (from-to)102-114
Number of pages13
JournalCatalysis Today
Volume113
Issue number1-2
DOIs
Publication statusPublished - 30 Mar 2006
Externally publishedYes

Keywords

  • Acidic zeolites
  • Heterogeneous catalysis
  • Hydrocarbon-pool
  • In situ NMR spectroscopy
  • Methoxy groups
  • MTO (methanol-to-olefin) process

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