Performance of alkali metal-loaded SrMnO₃ oxygen carriers in chemical looping oxidative dehydrogenation of ethylbenzene CIESC Journal    DOI: 10.11949/0438-1157.20251194

Fig.1 Simplified ethylbenzene CL-ODH reaction scheme.

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• Fig.2  XRD spectra of SrMnO₃ supported by different alkali metals
• Fig.3  H₂-TPR spectra of SrMnO₃ supported by different alkali metals
• Fig.4  EPR spectra of SrMnO₃ supported by different alkali metals
• Fig.5  XPS Mn 2p (a) and O 1s (b) spectra of SrMnO₃ supported by different alkali metals
• Table 1  Surface composition of as-prepared SrMnO₃ supported by different alkali metals
• Fig. 6  EB-TPR Mass Spectrum Curves of SrMnO3 supported by different alkali metals (a-f) ethylbenzene, styrene, toluene, benzene, H₂O, CO₂, H₂ (Conditions: reaction temperature = 300 ~ 650 ℃, m = 200 mg, FEB/Ar = 25 mL•min^-1, EB/Ar mixture atmosphere, containing Ar and passing an ethylbenzene bubbler at 30 ℃)
• Fig. 7  Product distribution in the ethylbenzene isothermal reaction over SrMnO₃ supported by different alkali metals (Conditions: reaction temperature = 600 ℃, m = 500 mg, FEB/Ar = 25 mL•min^-1, EB-Ar mixture atmosphere, containing Ar and passing an ethylbenzene bubbler at 30 ℃, ST for styrene, TOL for toluene, B for benzene)
• Fig. 8  Product distribution in the 20 successive CL-ODH of ethylbenzene over K-SMO in the 15th minute (Conditions: reaction temperature = 600 ℃, m = 500 mg, FEB/Ar = 25 mL•min^-1, EB-Ar mixture atmosphere, containing Ar and passing an ethylbenzene bubbler at 30 ℃, ST for styrene, TOL for toluene, B for benzene)
• Fig. 9  XRD spectra of fresh and cycled K-SMO
• Fig. 10  H₂-TPR spectra of fresh and cycled K-SMO