V activated electro-epoxidation catalyst in membrane electrode assembly system for the production of propylene oxide.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40169615.
- Also identified by DOI 10.1038/s41467-025-58486-y and PMC identifier 11961732.
- Licence recorded as CC BY-NC-ND.
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Abstract
Direct electro-epoxidation of propylene (D-EOPO) with a membrane electrode assembly (MEA) system represents a sustainable approach for producing propylene oxide, which can reduce ohmic losses and simplify product separation. To address the challenges of selectivity and activity, we develop an Ag/V catalyst and integrate it into the "liquid-free" MEA reactor for continues D-EOPO. The V in the catalyst facilitates the formation of Ag-O active centers, thereby reducing the generation energy of *O radicals. Meanwhile, V doping also results in a downshift of the d-band center of the Ag sites. Consequently, the formation of the crucial intermediate (*OC<sub>3</sub>H<sub>6</sub>) is significantly accelerated through the coupling *O with adsorbed propylene, thereby markedly improving propylene oxide (PO) production. The MEA reactor, integrated with the developed Ag/V catalyst, can maintain a stable production rate of PO at 227 μmol/h over a period of 78 hours. Thus, the "liquid-free" electro-epoxidation protocol developed here exhibits greater industrial applicability.