Unveiling the evolution of atomically dispersed Mn species supported on TiO2 for NO Selective Reduction Reaction with NH3

DOI

Observing catalysis behavior at atomic level for Mn sites can bring better understanding of its role towards NH3-SCR of NO. Herein, we prepared a series of highly dispersed MnOx/TiO2 via strong electrostatic adsorption with different loadings. Only very small concentration of Mn can achieve attractive NO conversion at elevated temperature. Notably, as Mn loading increased, NO conversion showed different behaviors, indicating Mn sites possibly exhibited different local environment. Based on our laboratory characterizations (XRD, HRTEM, HAADF-STM and Easy-XAFS), no nanoparticle was observed, however we cannot further confirm cluster or single atom which contributed to the performance. To resolve this puzzle, tracking molecularity and oxidation state of Mn at real time by operando XAS is the best option. We expect that this study will provide new insight towards relationship between structure and performance at atomic level for designing superior NH3-SCR catalysts.

Identifier
DOI https://doi.org/10.15151/ESRF-ES-945454918
Metadata Access https://icatplus.esrf.fr/oaipmh/request?verb=GetRecord&metadataPrefix=oai_datacite&identifier=oai:icatplus.esrf.fr:inv/945454918
Provenance
Creator YAN WANG ORCID logo; Antonio AGUILAR ORCID logo; Sarah KOMATY; Abdallah NASSEREDDINE; Cristina SILVA ORCID logo; Sudheesh Kumar VEERANMARIL
Publisher ESRF (European Synchrotron Radiation Facility)
Publication Year 2025
Rights CC-BY-4.0; https://creativecommons.org/licenses/by/4.0
OpenAccess true
Representation
Resource Type Data from large facility measurement; Collection
Discipline Particles, Nuclei and Fields