Abstract
Catalytic performances of soluble Co, Co/Mn, Co/Mn/Br, and Co/Mn/Ce catalysts for m-xylene (MX) oxidation without acetic acid (HAc) solvent were studied, comparing with Co/HAc catalysts. In m-toluic acid (MTA) production, a Ce-salt promoter could effectively substitute for bromide salts and the recycle alcohol/aldehyde liquid mixture acts as a more efficient promotor than either peroxides or MTA itself. The Co/Mn/Ce system, free of acetic acid and Br−, was a superior catalyst in terms of activity and selectivity to MTA. Just as for p-xylene oxidation using Co/Mn/Br catalysts, both the MX reaction rate and the MTA selectivity increased with temperature when using Co/Mn/Ce catalysts. Unlike p-xylene oxidation however, MX oxidation resulted in more coupling products. For MX oxidation catalyzed by a supported Co-imide complex in supercritical CO2, the activity was lower by more than an order of magnitude, but the MTA selectivity was greater.
Graphical Abstract
The selectivity behavior of the catalyst systems indicate that the Co/Mn/Ce system, free of acetic acid solvent and corrosive Br−, was a superior catalyst, both in terms of overall activity and selectivity for MTA.
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Acknowledgments
The authors thank MGK Co., EagleView Technologies, the Fundamental Research F unds for the Central Universities (FRF-BR-15-027A, FRF-BR-14-001B) and NSFC (Grant No. 51371018) for financial support. The authors thank Dana Doucet for experimental assistance.
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Song, Y., Hart, K.T. & Dooley, K.M. Waste-Reducing Catalytic Oxidation of m-Xylene to m-Toluic Acid. Catal Lett 146, 1213–1220 (2016). https://doi.org/10.1007/s10562-016-1746-1
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DOI: https://doi.org/10.1007/s10562-016-1746-1