Tailoring p-xylene selectivity in toluene methylation on medium pore-size zeolites

John H. Ahn, Robin Kolvenbach, Oliver Y. Gutiérrez, Sulaiman S. Al-Khattaf, Andreas Jentys, Johannes A. Lercher

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The p-xylene selectivity in toluene methylation was investigated over medium pore-size zeolites (H-ZSM5, H-ZSM11 and H-NU10) as well as after deposition of tetraethyl orthosilicate on the surface, isomorphous substitution of aluminum by iron and variation the crystal size. Higher reaction temperatures consistently resulted in higher p-xylene selectivity in the three reaction pathways for the formation of p-xylene during toluene methylation, i.e., methylation of toluene, isomerization of xylenes, further methylation and subsequent formation of xylenes after dealkylation of light hydrocarbons. The increased selectivity is attributed to the accumulation of slowly diffusing reaction products in the zeolite pores. Thus, the isomerization of m- and o-xylenes, as well as dealkylation of higher alkylated products influenced the xylene selectivity most strongly at high temperatures, while the intrinsic selectivity of the toluene alkylation dominates at lower reaction temperatures due to the absence of transport restrictions.

Original languageEnglish
Pages (from-to)52-59
Number of pages8
JournalMicroporous and Mesoporous Materials
Volume210
DOIs
StatePublished - 1 Jul 2015

Keywords

  • Acid chemistry in zeolites
  • Methanol conversion
  • Toluene methylation
  • Xylene isomerization
  • p-Xylene selectivity

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