Catalytic Performance of Metal-doped CeO2 Catalysts on the Prins Condensation of Isobutene with Polyoxymethylene

In this study, a series of metal-doped ceria (CeO2) solid acid catalysts were systematically investigated the catalytic performance, with a focus on how the dopant metal, preparation method, doping amount, and calcination temperature regulate the acidic properties.

XPS, Py-FTIR, and NH3-TPD characterization revealed that Al doping effectively induces the generation of oxygen vacancies in CeO2, which in turn promotes the formation of Brønsted acid sites and introduces medium-strength acid sites. This leads to a synergistic optimization of the Brønsted/Lewis acid ratio and acid strength distribution. Among the catalysts evaluated, Al-CeO2 prepared by co-precipitation with a Ce/Al molar ratio of 8 and calcined at 600 °C exhibited the most favorable Brønsted/Lewis acid ratio and medium-strength acid site density.