Weijiong Dai, Linquan Li, Zongqiang Liu, Jing Zhao, Yan Wang, Jiajun Zheng, Ruifeng Li
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引用次数: 0
Abstract
In the catalytic cracking of naphtha to olefins, the catalytic performance of ZSM-5 zeolite catalyst is affected by both the diffusion property and acidity of zeolite catalyst, and it is of great significance to enhance the catalytic performance of zeolite by adjusting the two factors reasonably. In this work, Fe was in situ introduced into the synthesis system by ammonium fluoride-assisted route, and plate-like ZSM-5 zeolites with different Fe contents were effectively prepared. The dimension along the b-axis of the plate-like zeolite crystal was tuned around at 100 nm. The XRD and UV-vis analysis demonstrate the effective incorporation of Fe species into ZSM-5 framework. The acidity characterization indicates that the Fe species can effectively reduce zeolite acid strength. Catalytic cracking of n-heptane was chosen to investigate the catalytic properties of the plate-like zeolites. The plate-like ZSM-5 zeolite can effectively improve propylene selectivity and catalytic stability in comparison with the sample C-Z. Meanwhile, by introducing a small amount of Fe, the contribution of monomolecular reaction can be enhanced and the hydrogen transfer reaction can thus be suppressed, leading to higher propylene yield and improved catalytic stability.
期刊介绍:
Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis.
The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.