In the current petrochemical market, the global demand for aromatics, especially benzene, toluene, and xylenes (BTXs), has increased sharply. The methanol-to-aromatic conversion (MTA) over ZSM-5 is among the most promising routes to satisfy this ever-growing demand. In this work, we show that highpressure operation during MTA leads to a large increase in aromatic selectivity while enhancing stability on-stream. Stable operation along with a very high selectivity to aromatics (up to 50%, with 20% BTXs) can be achieved on a commercial high-silica ZSM-5 (SiO2/Al2O3 = 280) at 400 °C, 30 bar total pressure, and WHSV = 8 h−1. The high partial pressure of primary olefins and the promoted methanol-induced hydrogen-transfer pathway result in an exponential increase in aromatization, while the high partial pressure of steam generated via dehydration of methanol leads to in situ coke removal and, therefore, to a much slower deactivation of the zeolite
|Original language||English (US)|
|Number of pages||12|
|State||Published - Mar 5 2021|
Bibliographical noteKAUST Repository Item: Exported on 2021-03-08
Acknowledgements: Funding for this work was provided by King Abdullah University of Science and Technology (KAUST). The authors wish to acknowledge and thank Sandra Ramirez Cherbuy for the illustration of the graphical abstract.
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