title: Aerobic oxidation of starch catalyzed by isopolyoxovanadate Na4Co(H2O)6V10O28.
abstract: The partial oxidation of starch was achieved in the presence of oxygen with Na4Co(H2O)6V10O28·18H2O (abbreviated as CoV10) as catalyst. The oxidation degree of starch was determined by FT-IR, XRD and SEM measurements, which indicated that the aerobic oxidation of starch was promoted by oxidative catalyst CoV10. The application of CoV10 could give a high oxidation degree (DO) of 1.35 COOH/100 GU and 2.07 CO/100 GU with 86 wt.% yield of solid starch under mild reaction conditions (pH=6; reaction time, 8 h; temperature, 50 °C; catalyst amount, 8 mg, when 1.5 g starch was used as substrate; atmospheric pressure). Among some vanadium compounds, CoV10 exhibited 4-fold activity higher than orthovanadate due to its coordination effect of cobalt and V10O28. Meanwhile, CoV10 could be recycled for six times with only a slight decrease in activity. Thus, CoV10/O2 is one of the most efficient systems for partial oxidation of starch reported so far.
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Chen
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Siqi
authors.initials: S
authors.lastname: Yan
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Hang
authors.initials: H
authors.lastname: Wang
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Hu
authors.affiliation: Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China. Electronic address: wangxh665@nenu.edu.cn.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Mingxin
authors.initials: M
authors.lastname: Huo
keywords: Aerobic oxidation; Carboxylic acid; Catalysis; Isopolyoxovanadate; Starch