Para-selectivity of toluene ethylation over ZSM-5 catalysts

F. Lónyi, J. Engelhardt, D. Kalló

Research output: Contribution to journalArticle

33 Citations (Scopus)


The title reaction was studied around 400 °C in an excess of toluene at atmospheric pressure when hydrogen was present in order to avoid coke formation. Space time, reaction temperature, catalyst pretreatment temperature, catalyst aging and poisoning with organic bases, and introduction of inorganic additives containing phosphorus and/or magnesium into the catalyst were varied. The change of yields and selectivities points to the primary formation of p-ethyltoluene in the course of ethylene addition. Secondary reactions are the isomerization to m-ethyltoluene and hydrodeethylation of ethyltoluenes. Disproportionation of toluene is a simultaneous transformation. The para-selectivity increased when the side reactions were suppressed by the reduction of Brönsted acidity. The effects of diffusion control can be disregarded.

Original languageEnglish
Pages (from-to)169-177
Number of pages9
Issue number2
Publication statusPublished - Feb 1991


  • Alkylation
  • ZSM-5
  • additives
  • para-selectivity
  • side reactions
  • toluene

ASJC Scopus subject areas

  • Environmental Science(all)

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