Selective oxidation of uronic acids into aldaric acids over gold catalyst

Herein, uronic acids available from hemicelluloses and pectin were used as raw material for the synthesis of aldaric acids. Au/Al 2 O 3 catalyst oxidized glucuronic and galacturonic acids quantitatively to the corresponding glucaric and galactaric acids at pH 8–10 and 40–60 °C with oxygen as oxidant...

Full description

Saved in:
Bibliographic Details
Published in:RSC advances 2015-01, Vol.5 (25), p.19502-19507
Main Authors: Rautiainen, Sari, Lehtinen, Petra, Chen, Jingjing, Vehkamäki, Marko, Niemelä, Klaus, Leskelä, Markku, Repo, Timo
Format: Article
Language:English
Subjects:
Aluminum oxide
Catalysts
Desorption
Gold
Oxidation
Raw materials
Surface chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Herein, uronic acids available from hemicelluloses and pectin were used as raw material for the synthesis of aldaric acids. Au/Al 2 O 3 catalyst oxidized glucuronic and galacturonic acids quantitatively to the corresponding glucaric and galactaric acids at pH 8–10 and 40–60 °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.
ISSN:2046-2069
2046-2069
DOI:10.1039/C5RA01802A