Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (4): 679-690.DOI: 10.1016/S1872-2067(19)63523-0

• Articles • Previous Articles     Next Articles

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

Wenjun Zhua,b, Xiao Chena, Jianhui Jina, Xin Dia, Changhai Lianga, Zhongmin Liub   

  1. 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:2019-08-22 Revised:2019-09-30 Online:2020-04-18 Published:2019-12-12
  • Supported by:
    This work was supported by the National Key R&D Program of China (2016YFB0600305).

Abstract: 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 CoCeOx-70 > CoCeOx-90 > Co3O4 > CoCeOx-50 > CoCeOx-20 > CeO2. CoCeOx-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 CoCeOx-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, CoCeOx-70 exhibits excellent stability and reusability in water vapor and CO2 atmosphere.

 

Key words: Propane, Total oxidation, Co3O4-CeO2, In-suit DRIFTS, Volatile organic compounds

CLC Number: