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3.6. Cu-OMS-2 stability evaluation TG-DSC, XRD and TEM techniques were used to evaluate the stability of the used Cu-OMS-2 catalyst (Supplementary data, Figs. S4¨C6). As shown in Fig. S4, there is no obvious mass loss or exothermal peak below 400 ¡ãC, which suggests that no carbon is deposited on Cu-OMS-2 catalyst during the reaction. The three weight loss steps and the endothermic peaks observed after 500 ¡ãC are caused by phase transformation of manganese oxide into lower oxidation state because of lattice oxygen loss [19]. As shown in Fig. S5, the characteristic XRD peaks of the Cu-OMS-2 cat- alyst before and after reaction are almost identical, which means that the structure and particle size of used catalyst remain the same during reaction. Fig. S6 shows the TEM image of the used Cu-OMS-2 catalyst with the short nano-rod morphology. From the TG-DSC, XRD and TEM characterization, it can be concluded that the Cu-OMS-2 catalyst has a robust stability under the reac- tion condition. |
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