Effect of alumina and zirconia as binders on the activity of Fe-BEA for NH<sub>3</sub>-SCR of NO

doi:10.1007/s11783-018-1012-4

Front. Environ. Sci. Eng.

2018, Vol. 12

Issue (1) : 15 https://doi.org/10.1007/s11783-018-1012-4

RESEARCH ARTICLE

Effect of alumina and zirconia as binders on the activity of Fe-BEA for NH₃-SCR of NO

Jin Shi¹, Zihao Zhang¹, Mingxia Chen¹, Zhixiang Zhang¹, Wenfeng Shangguan¹(

), Shunchao Gu^2,³, Hirano Shin-ichi³

¹. Research Center for Combustion and Environment Technology, Shanghai Jiao Tong University, Shanghai 200240, China
². School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
³. Hirano Institute for Materials Innovation, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

Fe-BEA with zirconia binder has higher SCR activity in high temperature.

Alumina enhances the low-temperature activity for greater NO oxidation and storage.

The SCR activity of Fe-BEA/Al decreases in high temperature.

Fe-BEA catalysts are active for the NH₃-SCR of NO. For industrial application, a binder should be added to the Fe-BEA catalysts to make them tightly adhere to the monoliths. The addition of alumina and zirconia as binders to the Fe-BEA led to a different effect on NO conversion. The catalytic activity of the mixed samples was evaluated by the temperature programmed procedure in a flow-reactor system, and the mechanism was analyzed via SEM, BET, XRD and XPS. It was found that larger iron particles were formed by the migration of parent iron particles in the Fe-BEA catalyst with alumina. This led to the increase of Fe³⁺ magnitude and iron cluster, enhancing the abilities of NO oxidation and storage. Accordingly, the SCR activity increased slightly in low temperature but decreased sharply in high temperature. For the Fe-BEA with zirconia sample, NO oxidation and storage abilities decreased due to the less iron clusters. The increase of Fe³⁺ magnitude resulted in higher catalytic oxidation ability, which gave rise to little change in the SCR activity compared with the Fe-BEA.

Keywords NH₃-SCR NO Fe-BEA Binder Alumina Zirconia

Corresponding Author(s): Wenfeng Shangguan

Issue Date: 05 December 2017

Cite this article:

Jin Shi,Zihao Zhang,Mingxia Chen, et al. Effect of alumina and zirconia as binders on the activity of Fe-BEA for NH₃-SCR of NO[J]. Front. Environ. Sci. Eng., 2018, 12(1): 15.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-018-1012-4
https://academic.hep.com.cn/fese/EN/Y2018/V12/I1/15

Fig.1 NO conversion over catalysts

Fig.2 SEM of powders. (a) Parent Fe-BEA ; (b) Zr; (c) Al; (d) Fe-BEA; (e) Fe-BEA/Zr; (f) Fe-BEA/Al

Fig.3 XRD patterns of catalysts

Fig.4 N₂ adsorption-desorption isotherms of catalysts

Fig.5 NO-TPD(a) and NO-oxidation(b) over catalysts

Fig.6 H₂-TPR(a) and O₂-TPD(b) over powder catalysts

Fig.7 XPS patterns of powder catalysts. (a)Fe-BEA, (b)Fe-BEA/Zr, (c)Fe-BEA/Al

Tab.1 BET surface area (A), average pore size (D), pore volume (V) and relative amount of Fe³⁺ of samples

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