期刊
ACS APPLIED NANO MATERIALS
卷 2, 期 12, 页码 7593-7603出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01691
关键词
heterogeneous catalysis; nanoceria; oxygen vacancy defects; in situ Mossbauer spectroscopy; NOx catalysis
资金
- Natural Sciences and Engineering Research Council of Canada [RGPIN-2018-05012]
- Canada Foundation for Innovation
Fe and Fe-O dispersed on nanoscale CeO supports are considered promising catalysts for oxidation and reduction catalysis and regarded as one of the better alternatives to precious metal catalysts for NO reduction. To understand the role of Fe ions, promoters, and factors that control the NOx reduction, we probed the local environments of Fe, Ce, and O using a range of spectroscopies. The order of Na promotion (sequential vs simultaneous) resulted in a significant difference in the catalytic activity by changing the local electronic structure around the Fe ions in reaction the conditions. The Ce M-4,M-5- and O K-edge X-ray spectroscopy results suggest stabilization of the 4f, e(g) orbitals, where Fe and promotor ions are affecting the t(2g) orbitals. Optimizing this bonding environment around the Fe active species with a promoter ion enables tuning of the NO reduction activity.
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