Trimodal Porous Hierarchical SSZ-13 Zeolite with Improved Catalytic Performance in the Methanol-to-Olefins Reaction

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 hiera...

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Published inACS catalysis Vol. 6; no. 4; pp. 2163 - 2177
Main Authors Zhu, Xiaochun, Hofmann, Jan P, Mezari, Brahim, Kosinov, Nikolay, Wu, Leilei, Qian, Qingyun, Weckhuysen, Bert M, Asahina, Shunsuke, Ruiz-Martínez, Javier, Hensen, Emiel J. M
Format Journal Article
LanguageEnglish
Published American Chemical Society 01.04.2016
Subjects
SSZ-13
zeolite
methanol-to-olefins
carbonaceous deposits
porosity
deactivation
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Summary: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.
ISSN:2155-5435
2155-5435
DOI:10.1021/acscatal.5b02480