Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts

Lieven E. Gevers, Linga R. Enakonda, Ameen Shahid, Samy Ould-Chikh, Cristina I. Q. Silva, Pasi P. Paalanen, Antonio Aguilar-Tapia, Jean-Louis Hazemann, Mohamed Nejib Hedhili, Fei Wen and Javier Ruiz-Martínez ()
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Lieven E. Gevers: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)
Linga R. Enakonda: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)
Ameen Shahid: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)
Samy Ould-Chikh: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)
Cristina I. Q. Silva: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)
Pasi P. Paalanen: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)
Antonio Aguilar-Tapia: Institut de Chimie Moléculaire de Grenoble, UAR2607 CNRS Université Grenoble Alpes
Jean-Louis Hazemann: Institut de Chimie Moléculaire de Grenoble, UAR2607 CNRS Université Grenoble Alpes
Mohamed Nejib Hedhili: King Abdullah University of Science and Technology, KAUST Core Labs
Fei Wen: Umicore AG & Co. KG
Javier Ruiz-Martínez: King Abdullah University of Science and Technology, KAUST Catalysis Center, Catalysis Nanomaterials and Spectroscopy (CNS)

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Mn-based oxides are promising for the selective catalytic reduction (SCR) of NOx with NH3 at temperatures below 200 °C. There is a general agreement that combining Mn with another metal oxide, such as CeOx improves catalytic activity. However, to date, there is an unsettling debate on the effect of Ce. To solve this, here we have systematically investigated a large number of catalysts. Our results show that, at low-temperature, the intrinsic SCR activity of the Mn active sites is not positively affected by Ce species in intimate contact. To confirm our findings, activities reported in literature were surface-area normalized and the analysis do not support an increase in activity by Ce addition. Therefore, we can unequivocally conclude that the beneficial effect of Ce is textural. Besides, addition of Ce suppresses second-step oxidation reactions and thus N2O formation by structurally diluting MnOx. Therefore, Ce is still an interesting catalyst additive.

Date: 2022
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DOI: 10.1038/s41467-022-30679-9

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