YANG Xiaolin, HUANG Jianlong, GAO Baojiao, et al. Catalytic characteristics of N-hydroxyphthalimide immobilized on polymer microspheres in oxidation of benzyl alcohol by molecular oxygen[J]. CIESC Journal, 2015, (4): 1318-1323.
YANG Xiaolin, HUANG Jianlong, GAO Baojiao, et al. Catalytic characteristics of N-hydroxyphthalimide immobilized on polymer microspheres in oxidation of benzyl alcohol by molecular oxygen[J]. CIESC Journal, 2015, (4): 1318-1323.DOI: 10.11949/j.issn.0438-1157.20141572.
Crosslinked polymeric microspheres GMA/MMA of glycidyl methacrylate (GMA) and methyl methacrylate (MMA) were prepared
and then N-hydroxyphthalimide (NHPI) was synthesized and immobilized on GMA/MMA microspheres through several polymer reaction steps
resulting in the functionalized microspheres GMA/MMA-NHPI. The solid catalyst GMA/MMA-NHPI in combination with Co(OAc)2 was used in aerobic oxidation of benzyl alcohol. Experimental results showed that the composite catalyst consisting of GMA/MMA-NHPI and Co(OAc)2 could effectively catalyze aerobic oxidation of benzyl alcohol by molecular oxygen under mild conditions (65℃ and normal pressure). Benzyl alcohol was deeply oxidized to benzoic acid. Although benzyl alcohol conversion rate was not very high
catalytic activity was satisfactory and benzoic acid selectivity was as high as 96%. The appropriate molar ratio of immobilized NHPI on GMA/MMA-NHPI microspheres to Co(OAc)2 was 20:1
and the appropriate amount of GMA/MMA-NHPI was 10% (mol) of the substrate. The solid catalyst GMA/MMA-NHPI microspheres showed good recycling and reusing performance.