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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Samenvatting

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).

Originele taal-2Engels
Pagina's (van-tot)2163-2177
Aantal pagina's15
TijdschriftACS Catalysis
Volume6
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 1 apr 2016

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