Extended Data Fig. 5: Operando XAS analysis results.
From: Pt migration–lockup in zeolite for stable propane dehydrogenation catalyst
a, Pt L3-edge XANES spectra of 0.25%Pt–Sn@S-1(4.00 μm) at different reaction times in PDH at 600 °C. The quantitative χ(R) space Pt L3-edge spectrum fitted curves of 0.25%Pt–Sn@S-1(4.00 μm)-600-H2 (b), 0.25%Pt–Sn@S-1(4.00 μm)-PDH-1 h (c), 0.25%Pt–Sn@S-1(4.00 μm)-PDH-3 h (d), 0.25%Pt–Sn@S-1(4.00 μm)-PDH-5 h (e), 0.25%Pt–Sn@S-1(4.00 μm)-PDH-7 h (f) and 0.25%Pt–Sn@S-1(4.00 μm)-PDH-10 h (g). Notes: for the EXAFS spectra fitting, the amplitude reduction factor \({S}_{0}^{2}=0.80\) was obtained through fitting the Pt foil. The Pt L3-edge EXAFS spectra were obtained by subtracting the pre-edge appropriate background and post-edge normalizing. The k2-weighted EXAFS functions were Fourier transformed (FT) in the k range 3–10 Å−1 and multiplied by a hanging window with a sill size of 1 Å−1, obtaining the high-quality data ranges (R = 1.2–3.4 Å) in radical space.
