Chemical grafting of tin alkyl complexes on the external surface of mordenite: A method for controlling the size of the pore entrances of zeolites

C. Nédez, A. Theolier, F. Lefebvre, A. Choplin*, Jean-Marie Maurice Basset, J. F. Joly, E. Benazzi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The tetra(alkyl)tin complexes SnR4 (R = Me, Et, i-Pr, Ph or cyclohexyl) and hydridotris(butyl)tin (Bu3SnH) react with the OH groups of the external surface of H-mordenite under the same experimental conditions as silica. For R = Bu, the formation of3 SiOSnBu3 as the major surface complex could be deduced from the 13C and 119Sn magic-angle spinning nuclear magnetic resonance (MAS NMR) spectra. The adsorption properties of these modified mordenites are considerably affected by the presence of the grafted complexes, in a way which is dependent on the nature of the alkyl ligands around Sn. When modified by grafted SnMe3 [2.3% (w/w) Sn], mordenite adsorbs n-hexane, 2-methylpentane at a lower rate, small amounts of 2,3-dimethylbutane (after 16 h) and no significant amounts of 2,2,4-trimethylpentane. All these results can be explained by the restriction of the size of the pore entrances by the grafted organometallic fragments, allowing, in some cases, the separation of mono- and dibranched hydrocarbons.

Original languageEnglish (US)
Pages (from-to)251-259
Number of pages9
JournalMicroporous Materials
Volume2
Issue number4
DOIs
StatePublished - Jan 1 1994

Keywords

  • C magic-angle spinning nuclear magnetic resonance
  • Sn magic-angle spinning nuclear magnetic resonance
  • modification by alkyltin complexes
  • modification of shape selectivity
  • mordenite

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Engineering(all)

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