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

Mudi Wu; Haobo Li; Shiwei Ma; Shiyi Chen; Wenguo Xiang

doi:10.1016/j.scitotenv.2021.148904

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

Sci Total Environ. 2021 Nov 15:795:148904. doi: 10.1016/j.scitotenv.2021.148904. Epub 2021 Jul 6.

Authors

Mudi Wu¹, Haobo Li¹, Shiwei Ma², Shiyi Chen³, Wenguo Xiang¹

Affiliations

¹ Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, 210096 Nanjing, China.
² Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, 210096 Nanjing, China; School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China.
³ Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, 210096 Nanjing, China. Electronic address: sychen@seu.edu.cn.

PMID: 34328951
DOI: 10.1016/j.scitotenv.2021.148904

Abstract

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.

Keywords: Catalytic oxidation; DFT; Double perovskite; Nanorods; Oxygen vacancy.