Citation: Wenjun Zhu, Xiao Chen, Jianhui Jin, Xin Di, Changhai Liang, Zhongmin Liu. Insight into catalytic properties of Co₃O₄-CeO₂ binary oxides for propane total oxidation[J]. Chinese Journal of Catalysis, ;2020, 41(4): 679-690. doi: S1872-2067(19)63523-0 shu

Insight into catalytic properties of Co₃O₄-CeO₂ binary oxides for propane total oxidation

a State Key Laboratory of Fine Chemicals & Laboratory of Advanced Materials and Catalytic Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
b Methanol to Olefins National Engineering Laboratory, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China

Received Date: 22 August 2019
Revised Date: 30 September 2019

Fund Project: This work was supported by the National Key R&

A series of Co₃O₄-CeO₂ binary oxides with various Co/(Ce+Co) molar ratios were synthesized using a citric acid method, and their catalytic properties toward the total oxidation of propane were examined. The activities of the catalysts decrease in the order CoCeO_x-70 > CoCeO_x-90 > Co₃O₄ > CoCeO_x-50 > CoCeO_x-20 > CeO₂. CoCeO_x-70 (Co/(Ce+Co)=70% molar ratio) exhibits the highest catalytic activity toward the total oxidation of propane, of which the T₉₀ is 310℃ (GHSV=120000 mL h^-1 g^-1), which is 25℃ lower than that of pure Co₃O₄. The enhancement of the catalytic performance of CoCeO_x-70 is attributed to the strong interaction between CeO₂ and Co₃O₄, the improvement of the low-temperature reducibility, and the increase in the number of active oxygen species. In-situ DRIFTS and reaction kinetics measurement reveal that Ce addition does not change the reaction mechanism, but promotes the adsorption and activation of propane on the catalyst surface. The addition of water vapor and CO₂ in reactant gas has a negative effect on the propane conversion, and the catalyst is more sensitive to water vapor than to CO₂. In addition, CoCeO_x-70 exhibits excellent stability and reusability in water vapor and CO₂ atmosphere.
- Propane,
- Total oxidation,
- Co₃O₄-CeO₂,
- In-suit DRIFTS,
- Volatile organic compounds
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Insight into catalytic properties of Co₃O₄-CeO₂ binary oxides for propane total oxidation