fig7

Figure 7. (A) Pt 4f XPS spectra of various catalysts; (B) Normalized Pt L₃-edge XANES and (C) FT k³-weighted EXAFS spectra of Pt-CuO/CoAlO; (D) NO conversion in the absence of O₂; (E) NO conversion and (F) N₂ selectivity in the presence of 3% O₂ for various catalysts (1000 ppm NO, 2000 ppm CO, 3% O₂ when used, Ar balance, 10000 h^-1)^[105]. Copyright 2023, American Chemical Society; (G) NO conversion and (H) N₂ selectivity of different catalysts (1000 ppm NO, 4000 ppm CO,1% O₂, Ar balance, 50000 h^-1); (I) charge density differences (blue and yellow represent electron accumulation and loss, respectively) and Bader charge map (red and blue represent positive and negative charges, respectively)^[107]. Copyright 2021, Wiley-VCH. XPS: X-ray photoelectron spectroscopy; XANES: X-ray absorption near edge structure; FT: fourier transforms; EXAFS: extended X-ray absorption fine structure.