Selective oxidation of glycerol to lactic acid over activated carbon supported Pt catalyst in alkaline solution

doi:10.1016/S1872-2067(15)61055-5

Abstract

Abstract:

Pt/activated carbon (Pt/AC) catalyst combined with base works efficiently for lactic acid production from glycerol under mild conditions. Base type (LiOH, NaOH, KOH, or Ba(OH)₂) and base/glycerol molar ratio significantly affected the catalytic performance. The corresponding lactic acid selectivity was in the order of LiOH > NaOH > KOH > Ba(OH)₂. An increase in LiOH/glycerol molar ratio elevated the glycerol conversion and lactic acid selectivity to some degree, but excess LiOH inhibited the transformation of glycerol to lactic acid. In the presence of Pt/AC catalyst, the maximum selectivity of lactic acid was 69.3% at a glycerol conversion of 100% after 6 h at 90 ℃, with a LiOH/glycerol molar ratio of 1.5. The Pt/AC catalyst was recycled five times and was found to exhibit slightly decreased glycerol conversion and stable lactic acid selectivity. In addition, the experimental results indicated that reaction intermediate dihydroxyacetone was more favorable as the starting reagent for lactic acid formation than glyceraldehyde. However, the Pt/AC catalyst had adverse effects on the intermediate transformation to lactic acid, because it favored the catalytic oxidation of them to glyceric acid.

Key words: Glycerol, Lactic acid, Platinum, Activated carbon, Oxidation, Base type

Chen Zhang, Tao Wang, Xiao Liu, Yunjie Ding. Selective oxidation of glycerol to lactic acid over activated carbon supported Pt catalyst in alkaline solution[J]. Chinese Journal of Catalysis, 2016, 37(4): 502-509.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61055-5

https://www.cjcatal.com/EN/Y2016/V37/I4/502

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