Journal
CHEMCATCHEM
Volume 12, Issue 24, Pages 6248-6258Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202001388
Keywords
Mn− Co mixed oxides; terephthalic acid synthesis; p-cymene oxidation; autoxidation; strong acidity
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Funding
- Romanian National Authority for Scientific Research and Innovation, CNCS/CCCI-UEFISCDI [PN-III-P2-2.1-PED-2016-1429]
- Romanian Ministry of Research and Innovation through the Core Program [PN18-11]
- University of Bucharest - UniRem project [244]
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In this study, manganese-cobalt (MnCo) mixed oxide catalysts were prepared by two different routes: co-precipitation and citrate method. The structures and properties of the mixed oxide catalysts were investigated by several techniques: nitrogen adsorption-desorption isotherms, X-ray diffraction, X-ray photoelectron spectroscopy, SEM, FTIR and UV-Vis spectroscopies, temperature-programmed reduction with H-2 (H-2-TPR) and temperature-programmed desorption of NH3 (NH3-TPD). Their catalytic performance was investigated in the liquid-phase selective oxidation of naturally occurred p-cymene to terephthalic acid, as an alternative to p-xylene, a fossil derivative fuel component. Within this study, we demonstrate that the materials prepared by the co-precipitation method present strong acid sites that boost the oxidation rate and allow oxidation of p-cymene up to terephthalic acid. The co-existence of a significant number of strong acid and centers in higher oxidation state (Co3+) are required for these materials to be selective.
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