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Mixed Co–Mn Oxide‐Catalysed Selective Aerobic Oxidation of Vanillyl Alcohol to Vanillin in Base‐Free Conditions
Author(s) -
Jha Ajay,
Patil Kashinath R.,
Rode Chandrashekhar V.
Publication year - 2013
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201300247
Subject(s) - vanillin , chemistry , base (topology) , free base , alcohol , inorganic chemistry , alcohol oxidation , organic chemistry , mathematical analysis , salt (chemistry) , mathematics
Manganese‐doped cobalt mixed oxide (MnCo‐MO) catalyst was prepared by a solvothermal method. The as‐prepared catalyst was characterised by X‐ray photoelectron spectroscopy, H 2 temperature‐programmed reduction, O 2 temperature‐programmed oxidation and XRD. This catalyst gave 62 % conversion with 83 % selectivity to vanillin in 2 hours for the liquid‐phase air oxidation of vanillyl alcohol without using base. Three different types of metal oxides were observed in the prepared catalyst, which could be identified as Co 3 O 4 , Mn 3 O 4 and CoMn 2 O 4 . Among these, the tetragonal phase of CoMn 2 O 4 was found to be more active and selective for vanillyl alcohol oxidation than Co 3 O 4 and Mn 3 O 4 . High‐resolution TEM characterisation revealed the morphology of MnCo‐MO nanorods with a particle size of 10 nm. Successful recycling of the catalyst was also established in this oxidation reaction.