Cargando…
Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts
Mn-based oxides are promising for the selective catalytic reduction (SCR) of NOx with NH(3) 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 o...
Autores principales: | , , , , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9135741/ https://www.ncbi.nlm.nih.gov/pubmed/35618799 http://dx.doi.org/10.1038/s41467-022-30679-9 |
_version_ | 1784714030656520192 |
---|---|
author | Gevers, Lieven E. Enakonda, Linga R. Shahid, Ameen Ould-Chikh, Samy Silva, Cristina I. Q. Paalanen, Pasi P. Aguilar-Tapia, Antonio Hazemann, Jean-Louis Hedhili, Mohamed Nejib Wen, Fei Ruiz-Martínez, Javier |
author_facet | Gevers, Lieven E. Enakonda, Linga R. Shahid, Ameen Ould-Chikh, Samy Silva, Cristina I. Q. Paalanen, Pasi P. Aguilar-Tapia, Antonio Hazemann, Jean-Louis Hedhili, Mohamed Nejib Wen, Fei Ruiz-Martínez, Javier |
author_sort | Gevers, Lieven E. |
collection | PubMed |
description | Mn-based oxides are promising for the selective catalytic reduction (SCR) of NOx with NH(3) 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 N(2)O formation by structurally diluting MnOx. Therefore, Ce is still an interesting catalyst additive. |
format | Online Article Text |
id | pubmed-9135741 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-91357412022-05-28 Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts Gevers, Lieven E. Enakonda, Linga R. Shahid, Ameen Ould-Chikh, Samy Silva, Cristina I. Q. Paalanen, Pasi P. Aguilar-Tapia, Antonio Hazemann, Jean-Louis Hedhili, Mohamed Nejib Wen, Fei Ruiz-Martínez, Javier Nat Commun Article Mn-based oxides are promising for the selective catalytic reduction (SCR) of NOx with NH(3) 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 N(2)O formation by structurally diluting MnOx. Therefore, Ce is still an interesting catalyst additive. Nature Publishing Group UK 2022-05-26 /pmc/articles/PMC9135741/ /pubmed/35618799 http://dx.doi.org/10.1038/s41467-022-30679-9 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Gevers, Lieven E. Enakonda, Linga R. Shahid, Ameen Ould-Chikh, Samy Silva, Cristina I. Q. Paalanen, Pasi P. Aguilar-Tapia, Antonio Hazemann, Jean-Louis Hedhili, Mohamed Nejib Wen, Fei Ruiz-Martínez, Javier Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts |
title | Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts |
title_full | Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts |
title_fullStr | Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts |
title_full_unstemmed | Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts |
title_short | Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts |
title_sort | unraveling the structure and role of mn and ce for nox reduction in application-relevant catalysts |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9135741/ https://www.ncbi.nlm.nih.gov/pubmed/35618799 http://dx.doi.org/10.1038/s41467-022-30679-9 |
work_keys_str_mv | AT geverslievene unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT enakondalingar unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT shahidameen unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT ouldchikhsamy unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT silvacristinaiq unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT paalanenpasip unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT aguilartapiaantonio unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT hazemannjeanlouis unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT hedhilimohamednejib unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT wenfei unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts AT ruizmartinezjavier unravelingthestructureandroleofmnandcefornoxreductioninapplicationrelevantcatalysts |