Effect of UiO-66 Precursors with Different Ce/Zr Ratios on the Performance of Pt-Based Catalysts in Dry Methane Reforming Reactions

• • Pt/3CeO2-ZrO2 (Ce/Zr = 3:1) achieved CH4 conversion of 86% and CO2 conversion of 93% at 800 °C, with H2/CO ratio near unity, demonstrating superior activity for dry reforming of methane. • • The catalyst exhibited no detectable carbon deposition after a 10 h stability test at 800 °C, as confirmed by TG and Raman analyses, indicating exceptional coking resistance. • • The optimal Ce/Zr ratio of 3:1 yielded the highest concentration of Ce3+ and Zr3+ species and abundant oxygen vacancies, correlating with strong metal-support interaction and enhanced defect density. • • Platinum on Pt/3CeO2-ZrO2 exists predominantly as single atoms and PtOx clusters, which are thermally stable and highly dispersed, contributing to sintering resistance and sustained catalytic performance.