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.

中文翻译：

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结合 b 轴厚度定制的 HZSM-5，通过 CoMnAl 氧化物提高合成气芳烃产量

合成气直接转化为芳烃具有广阔的工业前景，可以通过烯烃中间体使用双功能催化剂来实现。然而，开发具有高芳烃收率的双功能催化剂仍然是一个巨大的挑战。在这项工作中，我们合成了一系列具有不同形貌和孔结构的HZSM-5沸石，并将其与含有Co ₂ C纳米棱柱作为活性相的CoMnAl氧化物偶联，是高效合成气制烯烃催化剂，可直接用于芳烃合成。合成气。我们证明，HZSM-5 的b轴厚度减小和适当的布朗斯台德酸位密度有利于合成气通过双功能催化转化为芳烃。 HZSM-5沸石b轴厚度最小约为37 nm的双功能催化剂在280 ℃、2.0 MPa的温和反应条件下实现了70%以上的CO转化率，且稳定性高。芳烃选择性高于65%，副产物CH ₄选择性为3.5% ，芳烃收率高达27.1%。这项研究为从合成气中高效合成芳香烃提供了一个示范性的新策略。