Study of correlation between activity and structural properties of Cu-(Cr, Mn and Co)2 nano mixed oxides in VOC combustion

The correlation between structure and catalytic activities of Cu-(Cr, Mn and Co)2 mixed oxides synthesized by a sol–gel combustion method was investigated for the oxidation of 2-propanol. The catalysts were characterized by FTIR, XRD, XPS, TPR and UV–vis DRS. Although the same preparation conditions...

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Bibliographic Details
Published in:Ceramics international 2014-05, Vol.40 (4), p.6157-6163
Main Authors: Hosseini, S.A., Niaei, A., Salari, D., Alvarez-Galvan, M.C., Fierro, J.L.G.
Format: Article
Language:English
Subjects:
Ceramics
Nanostructures
Sol–gel chemistry
TPR
XPS
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Summary:The correlation between structure and catalytic activities of Cu-(Cr, Mn and Co)2 mixed oxides synthesized by a sol–gel combustion method was investigated for the oxidation of 2-propanol. The catalysts were characterized by FTIR, XRD, XPS, TPR and UV–vis DRS. Although the same preparation conditions were used for all the systems, obtained samples presented different pureness degrees. The structural characterization by XRD revealed that copper-chromite was pure CuCr2O4, while copper-manganese and copper-cobalt mixed oxides resulted in a mixture of the spinel (CuMn2O4 and Cu0.15Co2.85O4, respectively) and copper oxide phases. UV–vis DRS results also indicated a larger presence of small crystallites of CuO in the copper-cobalt oxide. Copper-cobalt oxide exhibited the highest activity in 2-propanol combustion which is explained, as expected for a Mars van Krevelen mechanism, by its higher reducibility at the reaction conditions and by a possible synergistic effect between this mixed oxide and CuO particles.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2013.11.068