Citation: ZHAN Lin-Jun, SUN Xiao-Yan, ZHOU Ying, ZHU Qiu-Lian, CHEN Yin-Fei, Lu Han-Feng. Deactivation Mechanism of CeO₂-Based Mixed Oxide Catalysts Supported on SiO₂[J]. Acta Physico-Chimica Sinica, ;2017, 33(7): 1474-1482. doi: 10.3866/PKU.WHXB201703312 shu

Deactivation Mechanism of CeO₂-Based Mixed Oxide Catalysts Supported on SiO₂

College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China

Received Date: 13 January 2017
Revised Date: 13 January 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (21506194, 21676255), and Natural Science Foundation of Zhejiang Province, China (Y14E080008, Y16B070025).

Here we reported the effect of the Cu-Mn-Ce-SiO₂ (CMC-SiO₂) interaction on the physical and chemical aspects of the catalytic combustion of toluene by adjusting the loading amount of the CMC mixed oxide on SiO₂. Notably, the CMC/KIT-6 catalyst with low CMC loading performed poorly with an obvious deactivation, owing to the inhibition of the metal oxides active sites, while the activity recovered after washing away some SiO₂. The catalysts were characterized by X-ray diffraction (XRD), H₂ temperature-programmed reduction (H₂-TPR), N₂ adsorption, and high-resolution transmission electron microscopy (HRTEM). Although there is no change in crystal structure after loading on SiO₂, active oxygen species immigrate from lattice to surface for SiO₂ surface rich in hydroxyl groups and having high dispersion of CMC, leading to deactivation of the CMC catalyst. However, it is worth mentioning that the lattice oxygen played a key role in catalytic combustion. The activity of the CMC catalyst recovered when the quantity of lattice oxygen increased upon removing surface -OH groups by calcination or removing some SiO₂ by alkali washing.
- SiO₂,
- Cu-Mn-Ce mixed oxide,
- Deactivation,
- Supporting effect,
- Catalytic combustion
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Deactivation Mechanism of CeO₂-Based Mixed Oxide Catalysts Supported on SiO₂