上海科技大学知识管理系统

The direct conversion of syngas to aromatics has a promising industrial future and can be achieved using bifunctional catalysts through olefin intermediates. However, the development of bifunctional catalysts with high aromatics yields remains a great challenge. In this work, we synthesized a series of HZSM-5 zeolites with different morphologies and pore structures and coupled them with CoMnAl oxides, which contain Co2C nanoprisms as the active phase and are highly efficient syngas to olefin catalysts, for aromatics synthesis directly from syngas. We demonstrate that a decreasing b-axis thickness and an appropriate density of Brønsted acid sites of HZSM-5 favors the syngas conversion to aromatics via bifunctional catalysis. The bifunctional catalysts with the smallest b-axis thickness of HZSM-5 zeolite of approximately 37 nm achieve a CO conversion of more than 70% under mild reaction conditions of 280 °C and 2.0 MPa, with high stability. The selectivity toward aromatics is higher than 65% with 3.5% selectivity toward by-product CH4 and the aromatics yield is up to 27.1%. This study provides an exemplary new strategy for the efficient synthesis of aromatic hydrocarbons from syngas. © 2024 The Royal Society of Chemistry.