Journal
CHEMSUSCHEM
Volume 8, Issue 7, Pages 1170-1178Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201403011
Keywords
carboxylic acids; enantioselectivity; hydrogenation; molybdenum; ruthenium
Funding
- JSPS KAKENHI [26249121, 263554]
- Grants-in-Aid for Scientific Research [14J03554, 23246013, 26249121] Funding Source: KAKEN
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Modification of Ru/C with a small amount of MoOx (RuMoOx/C) enhanced the catalytic activity in the hydrogenation of L-lactic acid to form 1,2-propanediol and maintained high selectivity. The turnover frequency based on the amount of Ru over the optimized RuMoOx/C catalyst (Mo/Ru molar ratio=1:16) was 114h(-1) at 393K, which was about 4 times higher than that over Ru/C. The same effect of MoOx was obtained over RuMoOx/SiO2, although RuMoOx/SiO2 showed slightly lower activity than that of RuMoOx/C. RuMoOx/C achieved a high yield of 95% in 18h at 393K and was applicable to various carboxylic acids to provide the corresponding alcohols in high yields. Modification with MoOx also brought about suppression of racemization and (S)-1,2-propanediol was obtained in high enantiomeric excess at 353K. Based on kinetic analysis and characterization data, such as XRD, TEM, CO adsorption by a volumetric method, FTIR spectroscopy, and X-ray absorption spectroscopy, for RuMoOx/C and RuMoOx/SiO2, the catalyst structure and reaction mechanism are proposed.
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