Selective Catalytic Reduction of NO x  with Ammonia over Fe‐Mo/ZSM‐5 Catalysts | Zendy

Li Z. | Zendy; Xie K. | Zendy; Huang W. | Zendy; Reschetilowski W. | Zendy

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Selective Catalytic Reduction of NO x with Ammonia over Fe‐Mo/ZSM‐5 Catalysts

Author(s) -

Li Z.,

Xie K.,

Huang W.,

Reschetilowski W.

Publication year - 2005

Publication title -

chemical engineering and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.403

H-Index - 81

eISSN - 1521-4125

pISSN - 0930-7516

DOI - 10.1002/ceat.200500113

Subject(s) - calcination , catalysis , nox , ammonia , zsm 5 , selective catalytic reduction , chemistry , inorganic chemistry , zeolite , x ray photoelectron spectroscopy , nuclear chemistry , materials science , chemical engineering , combustion , organic chemistry , engineering

The Fe‐Mo/ZSM‐5 catalysts were prepared by an impregnation method. A comparison of the catalytic activity for the reduction of NO x with ammonia over Fe‐Mo/ZSM‐5, Fe‐ZSM‐5 and Mo/ZSM‐5 catalysts was carried out. Also, the effects of the conditions used for calcination as well as of the Fe/Mo ratio on the catalytic performance of Fe‐Mo/ZSM‐5 catalysts were studied. It was found that Fe‐Mo/ZSM‐5 is more active than Fe‐ZSM‐5 and Mo/ZSM‐5 separately. Fe‐Mo/ZSM‐5 exhibited the best performance for SCR reaction with a Fe/Mo ratio of 1.5 and yielded the highest NO x conversion of 96 % at a temperature of 430 °C. The results also showed that the performance of Fe‐Mo/ZSM‐5 is sensitive to the conditions used during calcination. The bulk phase and surface composition of the Fe‐Mo/ZSM‐5 catalysts were determined by XRD, BET, and XPS techniques, respectively. The results revealed that the surface Mo percentage is the largest when the Fe/Mo ratio is 1.5, which may be related to its higher activity for catalytic reduction of NO x . XRD results indicate that the best catalytic performance of the Fe/Mo = 1.5 sample results from a strong interaction among Fe, Mo and HZSM‐5. In addition, it can be tentatively presumed that the surface nitrous species from the calcinations play an important role in SCR of NO x over Fe‐Mo/ZSM‐5 catalysts.

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