期刊
CHEMSUSCHEM
卷 10, 期 15, 页码 3105-3110出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201700996
关键词
acetol; electrocatalytic hydrogenation; electrocatalytic hydrooxygenation; glycerol; hydroxyacetone
Here, we propose the use of hydroxyacetone, a dehydration product of glycerol, as a platform for the electrocatalytic synthesis of acetone, 1,2-propanediol, and 2-propanol. 11 nonnoble metals were investigated as electrode materials in combination with three different electrolyte compositions toward the selectivity, Coulombic efficiency (CE), and reaction rates of the electrocatalytic hydrogenation (formation of 1,2-propanediol) and hydrodeoxygenation (formation of acetone and propanol) of hydroxyacetone. With a selectivity of 84.5 %, a reaction rate of 782 mmol h(-1) m(-2) and a CE of 32% (for 0.09 m hydrox-yacetone), iron electrodes, in a chloride electrolyte, yielded the best 1,2 propanediol formation. A further enhancement of the performance can be achieved upon increasing the educt concentration to 0.5 m, yielding a reaction rate of 2248.1 mmolh(-1) m(-2) and a CE of 64.5 %. Acetone formation was optimal at copper and lead electrodes in chloride solution, with lead showing the lowest tendency of side product formation. 2-propanol formation can be achieved using a consecutive oxidation of the formed acetone (at iron electrodes). 1-propanol formation was observed only in traces.
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