Abstract
A promising methanol-to-propylene catalyst was designed both at the molecular scale, exhibiting low Brønsted acid site density, and at the microscopic level providing large crystals (25 µm) with few defects. The potential of giant ZSM-5 zeolites synthesized in fluoride medium in the conversion of methanol into propylene led us to investigate the replacement of harmful hydrofluoric acid by non-toxic H3PO4. P-ZSM-5 zeolites were synthesized and thoroughly characterized by XRD, SEM, FT-IR, TPD propylamine, H/D isotope exchange and XRF analyses. The catalytic performance of these acid catalysts was evaluated in the methanol-to-olefins reaction at 673 K. The presence of phosphorous in the zeolite after calcination was ascertained and induced high ethylene selectivity (up to 33 %) and improved catalyst stability with respect to fluoride-mediated zeolites.
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Acknowledgments
BL thanks the Agence Nationale de la Recherche (ANR) for supporting financially the ANR-10-JCJC-0703 project (SelfAsZeo). PL would like to thank the National Research Fund Luxembourg for his PhD Grant (5898454). The technical assistance from Thierry Romero and Jean-Daniel Sauer was highly appreciated.
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Losch, P., Laugel, G., Martinez-Espin, J.S. et al. Phosphorous Modified ZSM-5 Zeolites: Impact on Methanol Conversion into Olefins. Top Catal 58, 826–832 (2015). https://doi.org/10.1007/s11244-015-0449-y
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DOI: https://doi.org/10.1007/s11244-015-0449-y