Citation: Quanming Ren, Shengpeng Mo, Jie Fan, Zhentao Feng, Mingyuan Zhang, Peirong Chen, Jiajian Gao, Mingli Fu, Limin Chen, Junliang Wu, Daiqi Ye. Enhancing catalytic toluene oxidation over MnO₂@Co₃O₄ by constructing a coupled interface[J]. Chinese Journal of Catalysis, ;2020, 41(12): 1873-1883. doi: 10.1016/S1872-2067(20)63641-5 shu

Enhancing catalytic toluene oxidation over MnO₂@Co₃O₄ by constructing a coupled interface

Quanming Ren ^a, ,
Shengpeng Mo ^a ,
Jie Fan ^a ,
Zhentao Feng ^a ,
Mingyuan Zhang ^a ,
Peirong Chen ^a,b,c ,
Jiajian Gao ^d ,
Mingli Fu ^a,b,c ,
Limin Chen ^a,b,c ,
Junliang Wu ^a,b,c ,
Daiqi Ye ^a,b,c

a School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China;
b National Engineering Laboratory for VOCs Pollution Control Technology and Equipment, South China University of Technology, Guangzhou 510006, Guangdong, China;
c Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency Disposal, South China University of Technology, Guangzhou 510006, Guangdong, China;
d School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore

Received Date: 4 March 2020
Revised Date: 17 April 2020

Fund Project: This work was supported by the National Key Research and Development Project of Research (2017YFC0212805, 2016YFC0204200, 2016YFC0204200, 2016YFC0204200), the National Natural Science Foundation of China (51878292, 51878293, 51678245), the Natural Science Foundation of Guangdong Province, China (2020A1515010929, 2015B020236002, 2014A030310431, 2016A030311003), the Science and Technology Project of Guangzhou City, China (201804020026), and the Science and Technology Program of Guangdong (2017B090901049).

Herein, a bottom-down design is presented to successfully fabricate ZIF-derived Co₃O₄, grown in situ on a one-dimensional (1D) α-MnO₂ material, denoted as α-MnO₂@Co₃O₄. The synergistic effect derived from the coupled interface constructed between α-MnO₂ and Co₃O₄ is responsible for the enhanced catalytic activity. The resultant α-MnO₂@Co₃O₄ catalyst exhibits excellent catalytic activity at a T_90% (temperature required to achieve a toluene conversion of 90%) of approximately 229 ℃, which is 47 and 28 ℃ lower than those of the pure α-MnO₂ nanowire and Co₃O₄-b obtained via pyrolysis of ZIF-67, respectively. This activity is attributed to the increase in the number of surface-adsorbed oxygen species, which accelerate the oxygen mobility and enhance the redox pairs of Mn⁴⁺/Mn³⁺ and Co²⁺/Co³⁺. Moreover, the result of in situ diffuse reflectance infrared Fourier transform spectroscopy suggests that the gaseous oxygen could be more easily activated to adsorbed oxygen species on the surface of α-MnO₂@Co₃O₄ than on that of α-MnO₂. The catalytic reaction route of toluene oxidation over the α-MnO₂@Co₃O₄ catalyst is as follows:toluene → benzoate species → alkanes containing oxygen functional group → CO₂ and H₂O. In addition, the α-MnO₂@Co₃O₄ catalyst shows excellent stability and good water resistance for toluene oxidation. Furthermore, the preparation method can be extended to other 1D MnO₂ materials. A new strategy for the development of high-performance catalysts of practical significance is provided.
- MnO₂@Co₃O₄,
- Toluene oxidation,
- Synergistic effect,
- Coupled interface,
- In situ DRIFTS
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Enhancing catalytic toluene oxidation over MnO₂@Co₃O₄ by constructing a coupled interface