Highly Selective and Stable Production of Aromatics via High Pressure Methanol Conversion
byT. Shoinkhorova, T. Cordero-Lanzac, A. Ramirez, S. Chung, A. Dokania, J. Ruiz-Martinez, J. Gascon
T. Shoinkhorova, T. Cordero-Lanzac, A. Ramirez, S. Chung, A. Dokania, J. Ruiz Martinez and J. Gascon. ACS Catal 11 (2021) 3602−3613. Highly Selective and Stable Production of Aromatics via High Pressure Methanol Conversion
In the current petrochemical market, the global demand for aromatics, especially BTXs, has increased sharply. The methanol-to-aromatics 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 aromatics selectivity while enhancing stability on stream. Stable operation along with a very high selectivity to aromatics (up to 50%, where 20% of 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.