TY - JOUR
T1 - Ionic liquid-modulated synthesis of MnO2 nanowires for promoting propane combustion
T2 - Microstructure engineering and regulation mechanism
AU - Tan, Bangjie
AU - Huo, Zhuobin
AU - Sun, Liang
AU - Ren, Lingling
AU - Zhao, Peng
AU - Feng, Nengjie
AU - Wan, Hui
AU - Guan, Guofeng
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/5
Y1 - 2023/1/5
N2 - Manganese oxides for catalytic combustion of VOCs are high profile owing to their excellent redox properties and oxygen storage capacities, while the precise regulation of microstructure to improve the activity remains challenging. Herein, imidazolium-based ionic liquids are employed as the template agents to synthesize a range of MnO2 for different structures and morphologies. The hydrogen bonding network of the ionic liquid and the π-π stacking interactions between the imidazole rings promoted the self-organization of [MnO6] into a specific structure. In this process, alteration of alkyl chain length of ionic liquids caused changes in surface tension and steric hindrance, affecting the growth of MnO2. A series of characterization results showed that MnO2 transformed from nanofibers to nanorods when the alkyl chain elongated from ethyl to octyl, accompanied by an increase in crystal size. This transformation decreased the specific surface area and surface-active oxygen of the catalyst, diminishing active sites available for the catalytic reaction. Therefore, the optimal catalytic performance of the prepared catalyst was achieved when the ionic liquid was selected as 1-ethyl-3-methylimidazolium tetrafluoroborate, with a propane conversion of 90% at 289 ºC. This work provided a feasible path to realize the microstructure engineering of non-noble metal catalysts.
AB - Manganese oxides for catalytic combustion of VOCs are high profile owing to their excellent redox properties and oxygen storage capacities, while the precise regulation of microstructure to improve the activity remains challenging. Herein, imidazolium-based ionic liquids are employed as the template agents to synthesize a range of MnO2 for different structures and morphologies. The hydrogen bonding network of the ionic liquid and the π-π stacking interactions between the imidazole rings promoted the self-organization of [MnO6] into a specific structure. In this process, alteration of alkyl chain length of ionic liquids caused changes in surface tension and steric hindrance, affecting the growth of MnO2. A series of characterization results showed that MnO2 transformed from nanofibers to nanorods when the alkyl chain elongated from ethyl to octyl, accompanied by an increase in crystal size. This transformation decreased the specific surface area and surface-active oxygen of the catalyst, diminishing active sites available for the catalytic reaction. Therefore, the optimal catalytic performance of the prepared catalyst was achieved when the ionic liquid was selected as 1-ethyl-3-methylimidazolium tetrafluoroborate, with a propane conversion of 90% at 289 ºC. This work provided a feasible path to realize the microstructure engineering of non-noble metal catalysts.
KW - Alkyl chain length
KW - Catalytic combustion
KW - Ionic liquid
KW - Manganese dioxide
KW - Propane
UR - http://www.scopus.com/inward/record.url?scp=85143820301&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2022.130431
DO - 10.1016/j.colsurfa.2022.130431
M3 - 文章
AN - SCOPUS:85143820301
SN - 0927-7757
VL - 656
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
M1 - 130431
ER -