High Stability of Methanol to Aromatic Conversion over Bimetallic Ca,Ga-Modified ZSM-5

Chuncheng Liu, Evgeny A. Uslamin, Elena Khramenkova, Enrico Sireci, Lucas T.L.J. Ouwehand, Swapna Ganapathy, Freek Kapteijn, Evgeny A. Pidko*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The production of valuable aromatics and the rapid catalyst deactivation due to coking are intimately related in the zeolite-catalyzed aromatization reactions. Here, we demonstrate that these two processes can be decoupled by promoting the Ga/HZSM-5 aromatization catalyst with Ca. The resulting bimetallic catalysts combine high selectivity to light aromatics with extended catalyst lifetime in the methanol-to-aromatics process. Evaluation of the catalytic performance combined with detailed catalyst characterization suggests that the added Ca interacts with the Ga-LAS, with a strong effect on the aromatization processes. A genetic algorithm approach complemented by ab initio thermodynamic analysis is used to elucidate the possible structures of bimetallic extraframework species formed under reaction conditions. The promotion effect of minute amounts of Ca is attributed to the stabilization of the intra-zeolite extraframework gallium oxide clusters with moderated dehydrogenation activity.

Original languageEnglish
Pages (from-to)3189-3200
JournalACS Catalysis
Volume12
Issue number5
DOIs
Publication statusPublished - 2022

Keywords

  • bimetallic catalyst
  • catalyst deactivation
  • dehydrogenation
  • global optimization
  • methanol-to-aromatics

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