Fig. 7: Proposed reaction mechanism for oxidative dehydrocyclization of liquid diol to lactone over Cu(x)Ca(1-x)O MMO catalyst. | Nature Communications

Fig. 7: Proposed reaction mechanism for oxidative dehydrocyclization of liquid diol to lactone over Cu(x)Ca(1-x)O MMO catalyst.

From: Solventless, ambient-pressure production of bio-based lactones over earth-abundant, mixed metal oxide catalysts for circular polyesters

Fig. 7: Proposed reaction mechanism for oxidative dehydrocyclization of liquid diol to lactone over Cu(x)Ca(1-x)O MMO catalyst.

[] represents an oxygen vacancy. 2e− redox cycle involves a single -O(Ca)-Cu-O(Ca)- site for the entire catalytic cycle involving two dehydrogenation steps, while 1e− redox cycle involves two different -O(Ca)-Cu-O(Ca)- sites, with each site catalyzing one dehydrogenation step. The pink annotations highlight the oxidation state of the Cu site involved.

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