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. 2020 Mar 10;117(12):6383–6390. doi: 10.1073/pnas.1917237117

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Fig. 2. — (A and B) Photoluminescence emission spectra with an excitation wavelength (λ_exc)= 374 nm. (C) Production rates of CH₄ and CO for various catalysts at 400 °C and 1 bar. (D) Stability test of DNS-25 at 400 °C and 1 bar. (E) Regeneration of catalysts in air at 400 °C and 1 bar for 11 cycles. (F) Production rate of CH₄ and CO with the activated DNS-25 at various GHSVs. (G) Stability test of activated DNS-25 at 400 °C and 1 bar for 200 h. (H) PL and (I) EPR, spectra of as-prepared DNS-25, activated DNS-25-Actv, and deactivated DNS-25-Deact.