期刊
RSC ADVANCES
卷 5, 期 25, 页码 19502-19507出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra01802a
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-
资金
- Tekes - the Finnish Funding Agency for Technology and Innovation [40224/11]
Herein, uronic acids available from hemicelluloses and pectin were used as raw material for the synthesis of aldaric acids. Au/Al2O3 catalyst oxidized glucuronic and galacturonic acids quantitatively to the corresponding glucaric and galactaric acids at pH 8-10 and 40-60 degrees C with oxygen as oxidant. The pH has a significant effect on the initial reaction rate as well as desorption of acid from the catalyst surface. At pH 10, a TOF value close to 8000 h(-1) was measured for glucuronic acid oxidation. The apparent activation energy E-a for glucuronic acid oxidation is dependent on the pH which can be attributed to the higher energy barrier for desorption of acids at lower pH.
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