Surface organometallic chemistry on zeolites. Synthesis and characterization of mordenites modified BU tetrabutyltin application to the C8 cut isomerization

M. Liddell*, A. Theolier, C. Nedez, F. Lefebvre, A. Choplin, J. M. Basset, F. Raatz, C. Travers, J. F. Joly

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Modification of a H-mordenite (HM) has been achieved by the controlled reaction of bulky organometallic complexes such as dineopentylmagnesium and tetrabutyltin with the external surface. For both complexes, the first observed reaction is a reaction of solvolysis leading to the formation of a grafted alkyl complex, i.e.→ SI-O-MgNP and →Si-O-SnBu, respectively, and to the liberation of one mole of alkane per atom M (M=Sn, Mg). Full characterization of these surface alkyl complexes has been achieved by IR, 13C MAS NMR, analysis of the evolved gases, elemental analysis. Thermal decomposition at 350°C under vacuum leads to surface oxidized (Sn(II) or Sn(IV) well dispersed on the external surface of the mordenite. These grafted mordenites mixed with a 0.5% Pt/Al2O3, exhibit higher performance in the C8 (orthoxylene+ethylbenzene) cut isomerization compared with non-modified mordenites. The activity is found to be higher and the dismutation yields have been strongly reduced, regeneration of grafted tetrabutyltin mordenite leads to additional reduction of dismutation.

Original languageEnglish (US)
JournalAmerican Chemical Society, Division of Petroleum Chemistry, Preprints
Volume36
Issue number4
StatePublished - Aug 1991
Externally publishedYes

ASJC Scopus subject areas

  • Fuel Technology

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