Chen, Lu;
Guan, Xuze;
Fei, Zhaofu;
Asakura, Hiroyuki;
Zhang, Lun;
Wang, Zhipeng;
Su, Xinlian;
... Wang, Feng Ryan; + view all
(2025)
Tuning the selectivity of NH3 oxidation via cooperative electronic interactions between platinum and copper sites.
Nature Communications
, 16
, Article 26. 10.1038/s41467-024-54820-y.
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Abstract
Selective catalytic oxidation (SCO) of NH3 to N2 is one of the most effective methods used to eliminate NH3 emissions. However, achieving high conversion over a wide operating temperature range while avoiding over-oxidation to NOx remains a significant challenge. Here, we report a bi-metallic surficial catalyst (PtSCuO/Al2O3) with improved Pt atom efficiency that overcomes the limitations of current catalysts. It achieves full NH3 conversion at 250 °C with a weight hourly space velocity of 600 ml NH3·h−1·g−1, which is 50 °C lower than commercial Pt/Al2O3, and maintains high N2 selectivity through a wide temperature window. Operando XAFS studies reveal that the surface Pt atoms in PtSCuO/Al2O3 enhance the redox properties of the Cu species, thus accelerating the Cu2+ reduction rate and improving the rate of the NH3-SCO reaction. Moreover, a synergistic effect between Pt and Cu sites in PtSCuO/Al2O3 contributes to the high selectivity by facilitating internal selective catalytic reduction.
| Type: | Article |
|---|---|
| Title: | Tuning the selectivity of NH3 oxidation via cooperative electronic interactions between platinum and copper sites |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1038/s41467-024-54820-y |
| Publisher version: | https://doi.org/10.1038/s41467-024-54820-y |
| Language: | English |
| Additional information: | This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10204987 |
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