期刊
JOURNAL OF CATALYSIS
卷 383, 期 -, 页码 97-102出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.12.044
关键词
Syngas; Aromatics; ZnO; H-ZSM-5; Manganese modulation
资金
- National Natural Science Foundation of China [21606224]
- Transformational Technologies for Clean Energy and Demonstration Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21030100]
Application of cheap and environmentally friendly ZnO to oxide-zeolite composite catalysts for the syngas-to-aromatics (STA) reaction is still challenging. Here, we report 80.1% aromatics in products excluding CO2, with 14.8% CO conversion over a mixed composite catalyst containing H-ZSM-5 and nanosized porous ZnO modulated by Mn. As little as 0.6-3.0 wt% of Mn can lead to a dramatic decrease in the particle size of ZnO and an obvious increase in oxygen vacancies. Mn species themselves do not act as the primary catalytic sites. The ability to convert syngas is positively correlated with oxygen vacancy concentration, whereas the ability to hydrogenate olefins is negatively correlated with it. The porous aggregated nanoparticles of ZnO modulated by Mn are resistant to sintering during syngas conversion. This provides a new strategy for STA catalyst design. (C) 2020 Elsevier Inc. All rights reserved.
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