Seeharaj P.Saenman T.Phiwhom T.Muangsuwan C.Srinives S.Kim-Lohsoontorn P.Mahidol University2023-05-162023-05-162023-06-01Journal of Environmental Chemical Engineering Vol.11 No.3 (2023)https://repository.li.mahidol.ac.th/handle/20.500.14594/81370To utilize carbon dioxide (CO2) which is the main greenhouse gas, this study developed effective metal doped-CeO2 nanospindle catalysts for conversion of CO2 and methanol into dimethyl carbonate (DMC). Ce0.9M0.1O2 nanospindles (where M is a transition metal, i.e., Zr, Fe, Cu and Co) were prepared by a template-free hydrothermal method. The substitution of different valence and size cations, including Zr4+, Fe3+, Cu2+ and Co2+, for Ce4+ sites in the fluorite CeO2 lattice induced the defect formation of surface-active sites of exposed Ce3+ and oxygen vacancies through the charge compensation and redox pair reactions. Ce0.9Fe0.1O2 solid solution with well-preserved spindle shaped morphology showed the highest catalytic performance by giving DMC yield at 3.56 mmol.gcat−1 with 100% DMC selectivity. The improvement of catalytic activity was attributed to the higher proportion of surface defect sites and variation of acid-base properties caused by the integration of Fe dopants into CeO2 ionic system.Chemical EngineeringArticleSCOPUS10.1016/j.jece.2023.1098132-s2.0-8515147165722133437