Citation:
MIAO Yingchun, ZHAI Zhongbiao, YANG Shengchun, WANG Jiaqiang. Catalytic Oxidation of 4-Methyl Pyridine to Isonicotinic Acid by H2O2 over Co-MCM-41[J]. Chinese Journal of Applied Chemistry,
;2011, 28(2): 188-193.
doi:
10.3724/SP.J.1095.2011.00260
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Liquid phase oxidation of 4-methylpyridine(4-MP) was carried out under mild reaction conditions over mesoporous Co-MCM-41 catalysts using aqueous hydrogen peroxide(30%) as oxidant and acetic acid as solvent without adding any initiator.The catalysts exhibited high substrate conversion and good product isonicotinic acid(4-PCA) selectivity.Recycling of the catalyst indicates that the catalyst can be used for a number of times without losing its activity significantly.The effects of solvent,reaction time,catalyst concentration,and reaction temperature on the catalyst performance were examined in order to optimize the conversion of 4-methylpyridine and the selectivity of isonicotinic acid.A 91.4% selectivity to isonicotinic acid was obtained at 96.5% conversion of 4-methylpyridine under the optimum reaction conditions:m(4-methyl pyridine):m(catalyst)=10:1,V(4-methyl pyridine):V(acetic acid glacial)=1:10,reaction temperature=363 K,reaction time=6 h.The reaction mechanism is proposed based on the results.
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Keywords:
- Co-MCM-41,
- catalytic oxidation,
- methyl pyridine,
- isonicotinic acid
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