期刊
ACS CATALYSIS
卷 11, 期 6, 页码 3602-3613出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c05133
关键词
ZSM-5; high pressure; methanol; acidity; deactivation; aromatics; MTA
资金
- King Abdullah University of Science and Technology (KAUST)
High-pressure operation in methanol-to-aromatic conversion over ZSM-5 leads to significantly improved aromatic selectivity and enhanced stability, achieving high selectivity to aromatics on commercial high-silica ZSM-5.
In the current petrochemical market, the global demand for aromatics, especially benzene, toluene, and xylenes Aromatics (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 high-pressure 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 degrees 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.
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