Abstract
Abstract In this paper, we report for the first time a one-pot reaction enabling total transformation of lactic acid to acetic acid over a Mo-V-Nb mixed oxide catalyst having an optimal atomic ratio 19:5:1. The mechanism of the reaction consists in two parallel ways leading to acetic acid: (i) oxi-dehydrogenation of lactic acid to pyruvic acid followed by decarboxylation and (ii) decarbonylation of lactic acid to acetaldehyde followed by oxidation. In the operating conditions we used, the catalyst is very active (total conversion of lactic acid) and selective towards acetic acid (100% selectivity). A 100% yield into acetic acid is hence obtained.
Highlights
The announced depletion of oil along with the problem of global warming have shown up the urgent need for using processes based on bio-derived renewable resources for the production of fuels and starting materials of the chemical industry [1,2]
Concerning the chemical conversion of lactic acid to acetic acid, the latter is notably reported as a side reaction in the oxidative dehydrogenation of lactic acid to pyruvic acid and dehydration of lactic acid to acrylic acid
This can be explained by i) the low content of niobium compared to molybdenum (Mo:V: Nb = 19:5:1), ii) the formation of microcrystals, iii) the formation of amorphous phases [34]
Summary
The announced depletion of oil along with the problem of global warming have shown up the urgent need for using processes based on bio-derived renewable resources for the production of fuels and starting materials of the chemical industry [1,2]. Concerning the chemical conversion of lactic acid to acetic acid, the latter is notably reported as a side reaction in the oxidative dehydrogenation of lactic acid to pyruvic acid and dehydration of lactic acid to acrylic acid. In acetic acid form lactic acid using an iron phosphate catalyst doped with molybdenum [18]. The formation of acetic acid (0.7%) during dehydration of lactic acid was reported by Zhang et al over NaY zeolite modified by alkali phosphate as a catalyst [19].
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