具有介孔结构和合适酸度的HZSM-5的构建：在Na-FeMn/HZSM-5沸石催化合成气转化为轻芳烃中的应用,Energy & Fuels

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具有介孔结构和合适酸度的HZSM-5的构建：在Na-FeMn/HZSM-5沸石催化合成气转化为轻芳烃中的应用
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-06-13 , DOI: 10.1021/acs.energyfuels.3c01021
Yangzhou Zhai ₁ , Guiyao Song ₁ , Qisheng Jiang ₁ , Zihao Wang ₁ , Chonghao Chen ₁ , Dianhua Liu ₁

Affiliation

芳烃在孔隙中的扩散对轻质芳烃的分布和沸石的稳定性影响很大，而芳烃的选择性与沸石的酸性有关。在此，在NaOH/TPAOH混合溶液存在下通过水热结晶制备出富含介孔结构和合适酸性的HZSM-5沸石。由于HZSM-5沸石的介孔结构有利于反应物和产物的扩散，因此它可以调节轻质芳烃在总芳烃中的分布并减弱焦炭沉积。同时，经过处理的HZSM-5沸石可以调节酸度，提高芳烃选择性。合理设计具有丰富介孔和适宜酸度的沸石，为合成气直接转化为轻芳烃提供了新的线索。通过催化性能测试，介孔HZSM-5的芳烃选择性为46.89%，轻质芳烃占总芳烃的55.86%，CO转化率为94.86%。此外，Ce修饰的介孔HZSM-5沸石可以调节酸度，使芳烃选择性提高到51.33%，同时保持轻芳烃占总芳烃的46.77%，同时保持较高的催化稳定性。

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Construction of HZSM-5 with a Mesoporous Structure and Suitable Acidity: Application in Catalytic Syngas Conversion to Light Aromatics over Na–FeMn/HZSM-5 Zeolite

The diffusion of aromatics in pores has a great influence on the distribution of light aromatics and the stability of zeolites, and the aromatics selectivity is related to the acidity of the zeolite. Here, the HZSM-5 zeolite, rich in a mesoporous structure and suitable acidity, was manufactured by hydrothermal crystallization in the presence of a NaOH/TPAOH mixed solution. Because the mesoporous structure of the HZSM-5 zeolite facilitates the diffusion of reactants and products, it can regulate the distribution of light aromatics in total aromatics and attenuate coke deposition. Meanwhile, the treated HZSM-5 zeolite can adjust the acidity to enhance the aromatics selectivity. The reasonable design of zeolites with abundant mesopores and suitable acidity provides a new clue for directly converting syngas to light aromatics. Through catalytic performance testing, we obtained 46.89% aromatics selectivity and 55.86% light aromatics in total aromatics at 94.86% CO conversion over mesoporous HZSM-5. Furthermore, the modified mesoporous HZSM-5 zeolite with Ce could tune the acidity to promote the aromatics selectivity to 51.33%, maintaining 46.77% light aromatics in total aromatics and high catalytic stability in the meanwhile.

更新日期：2023-06-13

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