2026-10-13T23:20:04Z https://www.scidb.cn/oai

10.57760/sciencedb.38428 2026-05-29T15:10:38Z

2026-05-29 Catalytic Performance of Metal-doped CeO2 Catalysts on the Prins Condensation of Isobutene with Polyoxymethylene doi:10.57760/sciencedb.38428 en The imbalance between the growing demand for isoprene and the surplus of isobutene has stimulated research interest in the production of isoprene from isobutene, wherein the Prins condensation of isobutene with polyoxymethylene serves as a crucial step. 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. Under optimized reaction conditions at 140 °C for 4 h, this catalyst achieved 51.75% polyoxymethylene conversion with 83% selectivity to the target product, 3-methyl-1,3-butanediol (MBD). This enhanced catalytic performance is attributed to the cooperative interplay between Lewis acid sites that activate polyoxymethylene and Brønsted acid sites that facilitate the hydrolysis of the 4,4-dimethyl-1,3-dioxane intermediate. Furthermore, the catalyst exhibited good reusability, maintaining its catalytic activity over six consecutive cycles without significant deactivation and demonstrating stable performance in this reaction system. Prins reaction; isobutylene; metal-doped CeO2; regulation of acid centers Qiu Bowen Kang Meirong Liu Hailong Stone Peak PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset http://www.doi.org/10.3724/j.issn1001-3555.2026.03.001 Science Data Bank