In situ MAS NMR and UV/VIS spectroscopic studies of hydrocarbon pool compounds and coke deposits formed in the methanol-to-olefin conversion on H-SAPO-34

Y. Jiang*, J. Huang, J. Weitkamp, M. Hunger

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

12 Citations (Scopus)

Abstract

In situ 13C MAS NMR and UV/Vis spectroscopy were applied to study hydrocarbon pool compounds and coke deposits formed during the methanol-to-olefin (MTO) conversion on H-SAPO-34 at 623 and 673 K. These experiments were performed using an MAS NMR rotor reactor and, for comparison, a standard fixed-bed reactor. The 13C MAS NMR spectra recorded under steady-state conditions consist of characteristic signals of alkyl groups (18 to 29 ppm) and carbon atoms in aromatic compounds (125 to 135 ppm). The simultaneously recorded UV/Vis spectra consist of bands of dienylic (345 nm) and trienylic carbenium ions (430 nm), dienes (245 nm), polyalkylaromatics (280 nm), and polycyclic aromatics with chain-like topology, such as polymethylanthracenes (400 nm). 13C MAS NMR studies of the 13C/12C scrambling between 13C-enriched methanol and non-enriched organic deposits on used H-SAPO-34 catalysts support the paring mechanism for the growth of alkyl groups at polyalkylaromatics during the methanol to olefin reaction.

Original languageEnglish
Title of host publicationFrom zeolites to porous MOF materials
Subtitle of host publicationthe 40th anniversary of international zeolite conference
EditorsRuren Xu, Zi Gao, Jiesheng Chen, Wenfu Yan
Place of PublicationAmsterdam
Pages1137-1144
Number of pages8
Volume170
EditionB
DOIs
Publication statusPublished - 2007
Externally publishedYes

Publication series

NameStudies in Surface Science and Catalysis
NumberA
Volume170
ISSN (Print)01672991

Keywords

  • Coke deposits.
  • H-SAPO-34
  • In situ solid-state NMR spectroscopy
  • In situ UV/Vis spectroscopy
  • MTO

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