The Influence of Residual Sodium on the Catalytic Oxidation of Propane and Toluene over Co3O4 Catalysts

Catalysts

JoseLuis Valverde¹  Yanglong Guo²  Weidong Zhang³  Anne Giroir-Fendler³  Guangtao Chai³ 

[1] Department of Chemical Engineering, University of Castilla La Mancha, Avda. Camilo José Cela 12, 13071 Ciudad Real, Spain;Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;Université Claude Bernard Lyon 1, Université de Lyon, CNRS, IRCELYON, 2 Avenue Albert Einstein, F-69622 Villeurbanne, France;

关键词: catalytic oxidation;    propane;    toluene;    Co₃O₄;    residual sodium;   

DOI  :  10.3390/catal10080867

来源: DOAJ

【 摘 要 】

A series of Co₃O₄ catalysts with different contents of residual sodium were prepared using a precipitation method with sodium carbonate as a precipitant and tested for the catalytic oxidation of 1000 ppm propane and toluene at a weight hourly space velocity of 40,000 mL g⁻¹ h⁻¹, respectively. Several techniques were used to characterize the physicochemical properties of the catalysts. Results showed that residual sodium could be partially inserted into the Co₃O₄ spinel lattice, inducing distortions and helping to increase the specific surface area of the Co₃O₄ catalysts. Meanwhile, it could negatively affect the reducibility and the oxygen mobility of the catalysts. Moreover, residual sodium had a significant influence on the catalytic activity of propane and toluene oxidation over the synthesized Co₃O₄ catalysts. The catalyst derived from the precursor washed three times presented the best activity for the catalytic oxidation of propane. The origin was traced to its better reducibility and higher oxygen mobility, which were responsible for the formation of active oxygen species. On the other hand, the catalyst obtained from the precursor washed two times exhibited better performance in toluene oxidation, benefitting from its more defective structure and larger specific surface area. Furthermore, the most active catalysts maintained constant performance in cycling and long-term stability tests of propane and toluene oxidation, being potentially applicable for practical applications.

【 授权许可】

Unknown