Effect of post-synthesis hydrogen-treatment on the nature of iron species in Fe-BEA as NH3-SCR catalyst
Journal article, 2014

Post-synthesis treatment of Fe-BEA with hydrogen has previously been shown to improve the low-temperature activity for NO reduction during standard NH3-SCR. Here, a 2 wt.% Fe-BEA sample was prepared by incipient wetness impregnation and calcined in air at 450 °C for 3 h. The fresh sample was then treated with 5% H2 at 650 °C for 5 h. The evolution of different iron species in Fe-BEA before and after H2-treatment was studied using in situ DRIFT spectroscopy with NO as a probe molecule and by UV-Vis spectroscopy. The DRIFTS results show that the relative intensity of the absorption peak representing isolated iron species increases significantly after H2-treatment of the fresh Fe-BEA sample. Furthermore, the UV-Vis results show a significant decrease in the relative intensity in the UV region representing larger iron particles, whereas the relative intensity representing smaller iron species increases after treatment of Fe-BEA with hydrogen. The results show that the low-temperature NO reduction during standard NH3-SCR can be increased for Fe-BEA by redispersion of smaller iron species into the zeolite structure by hydrogen-treatment.

Author

Soran Shwan

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Jonas Jansson

Volvo Group

Louise Olsson

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 4 9 2932-2937

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Physical Chemistry

Chemical Process Engineering

DOI

10.1039/C4CY00236A

More information

Latest update

11/19/2018