Poonsawat T.Promcharoen P.Meechai T.Chuaitammakit L.C.Somsook E.Mahidol University2024-02-082024-02-082023-12-19ACS Omega Vol.8 No.50 (2023) , 47846-47855https://repository.li.mahidol.ac.th/handle/20.500.14594/95724The promising influences of K+ and Ca2+ ions in the development of effective MnO2 for the selective oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid (FDCA) were studied for the catalytic performance under a high-pressure reaction of aqueous O2 (0.5 MPa) in a basic system. Various oxidation states of manganese in MnO2 were able to accelerate the oxidation of 5-formyl-2-furancarboxylic acid to FDCA in the rate-determining step. The results were in good agreement that Ca2+ played a key role in the highest FDCA yield up to 85% due to the associated cations on the local coordination to enhance the high surface area and the electronic effect on the manganese ion. Both K-MnO2 and Ca-MnO2 catalysts showed excellent catalytic activities without a significant change in the efficiency in the reusability experiments.Chemical EngineeringChemistryArticleSCOPUS10.1021/acsomega.3c063332-s2.0-8518007164424701343