Methanol Aromatization over Zn and Ce Modified Hierarchical ZSM-5 Catalysts: Effect of Ce as a Promoter

Zinc (Zn) and cerium (Ce) modified hierarchical ZSM-5 (HZ) catalysts were prepared by incipient wetness impregnation, and their catalytic performances in methanol to aromatics reaction were evaluated in a fixed-bed reactor operating at 400°C under 0.1 MPa and WHSV of 1.0 h−1. The structure, acidity,...

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Published in:Advances in materials science and engineering 2022, Vol.2022, p.1-9
Main Authors: Wei, Zhenhao, Ji, Yufan, Huang, Yiping, Huang, Jingjing, Huang, Yunguo, Yue, Changhai, Li, Junzhou, Tang, Mingwei, Liu, Yunfang, Liu, Hanfei, Zhu, Hao, Zhu, Kai, Yang, Fan, Zhu, Xuedong
Format: Article
Language:English
Subjects:
Ammonia
Catalysts
Cerium
Heat conductivity
Methanol
Radiation
Selectivity
Sensors
Zeolites
Zinc
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Summary:Zinc (Zn) and cerium (Ce) modified hierarchical ZSM-5 (HZ) catalysts were prepared by incipient wetness impregnation, and their catalytic performances in methanol to aromatics reaction were evaluated in a fixed-bed reactor operating at 400°C under 0.1 MPa and WHSV of 1.0 h−1. The structure, acidity, and state of Zn species of the Zn/Ce modified HZ catalysts were investigated via several characterization techniques, including XRD, NH3-TPD, H2-TPR, nitrogen adsorption, and XPS. The results showed that the aromatization activity of 2 wt% Zn-modified HZ (2% Zn/HZ) could be significantly enhanced by loading 0.6 wt% Ce, which was mainly attributed to the increase in surface ZnOH+ species. Moreover, it was found that Ce inhibited pore blockage caused by Zn. Consequently, compared to 2% Zn/HZ, 2% Zn-0.6% Ce/HZ exhibited higher aromatic selectivity and longer catalyst lifetime.
ISSN:1687-8434
1687-8442
DOI:10.1155/2022/7408284