| Title: | In Situ Fabrication of Highly Dispersed Co-Fe-Doped-delta-MnO(2) Catalyst by a Facile Redox-Driving MOFs-Derived Method for Low-Temperature Oxidation of Toluene |
| Author(s): | Huang Q; Zhao P; Wang W; Lv L; Zhang W; Pan B; |
| Address: | "State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing210023, China" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "Cost-efficient and durable manganese-based catalysts are in great demand for the catalytic elimination of volatile organic compounds (VOCs), which are dominated not only by the nanostructures but also by the oxygen vacancies and Mn-O bond in the catalysts. Herein, a series of nanostructured Co-Fe-doped-delta-MnO(2) catalysts (Co-Fe-delta-MnO(2)) with high dispersion were in situ fabricated by employing metal-organic-frameworks (MOFs) as reducing agents, dopants, and templates all at the same time. The as-obtained Co-Fe-delta-MnO(2)-20% catalyst exhibited robust durability and high catalytic activity (225 degrees C) for toluene combustion even in the presence of 5 vol % water vapor, which is 50 degrees C lower than that of pristine delta-MnO(2). Various characterizations revealed that the homogeneously dispersed codoping of Co and Fe ions into delta-MnO(2) promotes the generation of oxygen vacancies and weakens the strength of the Mn-O bond, thus increasing the amount of adsorbed oxygen (O(ads)) and improving the mobility of lattice oxygen (O(latt)). Meanwhile, due to successfully inheriting the framework structures of MOFs, the obtained catalyst exhibited a high surface area and three-dimensional mesoporous structure, which contributes to diffusion and increases the number of active sites. Moreover, in situ DRIFTS results confirmed that the toluene degradation mechanism on the Co-Fe-delta-MnO(2)-20% follows the MVK mechanism and revealed that more O(ads) and high-mobility O(latt) induced by this novel method contribute to accumulating and mineralizing key intermediates (benzoate) and thus promote toluene oxidation. In conclusion, this work stimulates the opportunities to develop Co-Fe-delta-MnO(2) as a class of nonprecious-metal-based catalysts for controlling VOC emissions" |
| Keywords: | Catalytic oxidation heteroatomic doping manganese dioxide metal-organic frameworks volatile organic compounds; |
| Notes: | "PubMed-not-MEDLINEHuang, Qianlin Zhao, Puzhen Wang, Weiwei Lv, Lu Zhang, Weiming Pan, Bingcai eng 2022/11/26 ACS Appl Mater Interfaces. 2022 Dec 7; 14(48):53872-53883. doi: 10.1021/acsami.2c16620. Epub 2022 Nov 25" |
