Trimodal porous hierarchical SSZ-13 Zeolite with improved catalytic 2 performance in the Methanol-to-Olefins reaction

Xiaochun Zhu, J.P. Hofmann, B. Mezari, N. Kosinov, Leilei Wu, Qingyun Qian, B.M. Weckhuysen, S. Asahina, Javier Ruiz-Martínez, E.J.M. Hensen

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Abstract

Chabazite zeolites with trimodal porosity (native micropores of the CHA framework, an additional network of larger micropores of ∼0.5 nm, and mesopores) were synthesized by adding diquarternary ammonium-type surfactant C22-4-4 cations and fluoride anions in the synthesis of SSZ-13 zeolite. The hierarchical SSZ-13 zeolites are fully crystalline and exhibit similar acidity as bulk SSZ-13 zeolite. The increased diffusion rate in the hierarchical SSZ-13, proven by uptake experiments of bulky molecules and selective staining by thiophene oligomers, resulted in much slower catalyst deactivation in the methanol-to-olefins (MTO) reaction. Confocal fluorescent images of spent hierarchical SSZ-13 zeolites reveal homogeneous distribution of carbonaceous deposits, indicating that the micropore space has been completely utilized during the MTO reaction. (Graph Presented).

Original languageEnglish
Pages (from-to)2163-2177
Number of pages15
JournalACS Catalysis
Volume6
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • carbonaceous deposits
  • deactivation
  • methanol-to-olefins
  • porosity
  • SSZ-13
  • zeolite

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