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Instruments / Technical Area	Publication Details	Published	Actions
B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS E01-JEM ARM 200CF E02-JEM ARM 300CF I20-EDE-Energy Dispersive EXAFS (EDE)	Tuning the selectivity of NH3 oxidation via cooperative electronic interactions between platinum and copper sites Lu Chen , Xuze Guan , Zhaofu Fei , Hiroyuki Asakura , Lun Zhang , Zhipeng Wang , Xinlian Su , Zhangyi Yao , Luke L. Keenan , Shusaku Hayama , Matthijs A. Van Spronsen , Burcu Karagoz , Georg Held , Christopher S. Allen , David G. Hopkinson , Donato Decarolis , June Callison , Paul J. Dyson , Feng Ryan Wang Nature Communications 16 DOI: 10.1038/s41467-024-54820-y Diamond Proposal Number(s): [30622, 33257, 31922] Open Access Show Abstract ▼ 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.	Jan 2025

Instruments / Technical Area

Publication Details

Published

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B07-C-Versatile Soft X-ray beamline: Ambient Pressure XPS and NEXAFS
E01-JEM ARM 200CF
E02-JEM ARM 300CF
I20-EDE-Energy Dispersive EXAFS (EDE)

Tuning the selectivity of NH3 oxidation via cooperative electronic interactions between platinum and copper sites