Boosting the surface oxygen activity for high performance Iron-based perovskite oxide

• Published in: The Science of the total environment 2021-11, Vol.795, p.148904-148904, Article 148904
• Main Authors: Wu, Mudi, Li, Haobo, Ma, Shiwei, Chen, Shiyi, Xiang, Wenguo
• Format: Article
• Language: English
• Subjects: Catalytic oxidation; DFT; Double perovskite; Nanorods; Oxygen vacancy
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2021.148904

Surface oxygen activities always play an important role in various heterogeneous reaction processes. In this study, the surface oxygen activity of studied perovskite oxides is greatly enhanced after the composition and morphology are tuned. It is worth noting that the surface oxygen activity is enhanced correspondingly, accompanied by higher surface area, better reducibility, and superior low-temperature reactivity of studied catalysts. The sample introduced with nickel atom and nanorods structure possesses higher surface oxygen activity and vacancies with superior performance including T10 at 221 °C and T90 at 243 °C, nearly 90 °C elevations. Double perovskite oxides, especially with nanorods structure are verified to be composed of more surface active oxygen, which could be related to low-temperature redox ability and superior oxygen vacancies. Based on the DFT calculation, introducing nickel element is confirmed to be able to efficiently boost the generation of oxygen vacancies and adsorption of oxygen molecular, in accord with the analysis of characterization. To sum up, the strategy of introducing the nickel atom and nanorods structure could effectively tune the surface oxygen activity and generate more oxygen vacancies, which would be beneficial to the catalytic performance of toluene catalytic oxidation correspondingly. [Display omitted] •The control over composition and morphology could efficiently boost the catalytic performance of studied catalysts.•The surface oxygen activity was demonstrated detailedly based on experiment and theoretical calculation.•By tuning composition and morphology, surface oxygen activity was improved tremendously.•One-step hydrothermal synthesis method simplifies the production of high-performance perovskite oxide nanorods.