Cross-linked chitosan supporting polyoxometalates catalyst with adjustable redox property for H2O2-based oxidation reactions

A series of polyoxometalates-based chitosan (CS) hybrids was prepared by the anion-exchange of a newly task specific designed cross-linked CS ionic polymer with a Keggin H3PW12O40. The obtained CS1.5-BPA-PW hybrid can be used as highly efficient solid catalyst for H2O2-based epoxidation of alkenes and oxidation of alcohols, affording high activity and steady catalytic cycles. The unique cross-linked catalyst framework and the appropriate intramolecular electron interaction between amino groups and heteropolyanions play an important role in achieving efficient catalytic performance. (C) 2017 Elsevier B.V. All rights reserved.