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

Highlights

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.

Abstract

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.

Graphical abstract

Keywords

NH₃-SCR / NO / Fe-BEA / Binder / Alumina / Zirconia

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