| Autor: |
Lee, Dong Hyung, Hong, Seong Jin, Jeong, Min Hye, Bae, Jong Wook |
| Zdroj: |
Industrial & Engineering Chemistry Research; October 2024, Vol. 63 Issue: 43 p18298-18307, 10p |
| Abstrakt: |
Chemical looping (CL)-based oxidative dehydrogenation (CL-ODH) of ethane (C2H6) and successive CO2activation to form CO were investigated on FeMTiOx catalysts (M = Ni, Sn, Co, Mn, Ce metal oxide), and a proper reduction extent of active metal oxides was found to be well correlated with C2H6conversion as well as the amount of oxidized COxformation during the C2H6activation step. The easily reducible FeCeTiOx showed a higher C2H6conversion of 19.6% and an ethylene (C2H4) selectivity of 73.4% due to the higher redox property of the CeO2promoter, which also showed a higher CO2activation to CO with its productivity of 0.130 mmol/g due to the presence of abundant oxygen vacant sites with smaller crystallite sizes of active metal oxides. The fast oxygen transfer rate and thermal stability of Ce-incorporated FeTiOx were responsible for an enhanced ethylene productivity. The newly formed MnTiO3phases with coexisting FeTiO3phases on FeMnTiOx were found to be active sites for the CL-ODH reaction due to an increased number of stable lattice oxygens with the highest C2H4selectivity of 80%. However, easy reducibility and facile aggregation of NiO and Co3O4phases on FeNiTiOx and FeCoTiOx revealed a higher selectivity to COx in the range of 18.3–18.9% compared to the optimal FeCeTiOx with a lower COx selectivity of 14.4%. The lower C2H6conversion on FeSnTiOx was also attributed to the suppressed redox properties of active metal oxides. |
| Databáze: |
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