摘要
In this work,an amino-modified cellulose nanofiber sponge was prepared and used as a support for polyoxometalate(POM)catalysts with a high loading efficiency.Fourier transform infrared spectroscopy,thermogravimetric analysis,and energy-dispersive X-ray spectroscopy revealed that an Anderson-type POM,(NH4)4[CuMo6O18(OH)6]·5H2O was successfully immobilized on the sponge based on electrostatic interactions.Morphological analysis indicated that the POM-loaded sponge retained its porous structure and that the POM was homogeneously distributed on the sponge walls.The POM-loaded sponge exhibited excellent mechanical properties by recovering 79.9%of its original thickness following a 60%compression strain.The POM-loaded sponge was found to effectively catalyze the hydroboration of phenylacetylenes,yielding excellent conversion and regioselectivity of up to 96%and 99%,respectively.Its catalytic activity remained unchanged after five reuse cycles.These findings represent a scalable strategy for immobilizing POMs on porous supports.
In this work, an amino-modified cellulose nanofiber sponge was prepared and used as a support for polyoxometalate（POM） catalysts with a high loading efficiency. Fourier transform infrared spectroscopy, thermogravimetric analysis, and energy-dispersive X-ray spectroscopy revealed that an Anderson-type POM,（NH4）4[CuMo6O18（OH）6]·5 H2O was successfully immobilized on the sponge based on electrostatic interactions. Morphological analysis indicated that the POM-loaded sponge retained its porous structure and that the POM was homogeneously distributed on the sponge walls. The POM-loaded sponge exhibited excellent mechanical properties by recovering 79.9% of its original thickness following a 60% compression strain. The POM-loaded sponge was found to effectively catalyze the hydroboration of phenylacetylenes, yielding excellent conversion and regioselectivity of up to 96% and 99%, respectively. Its catalytic activity remained unchanged after five reuse cycles. These findings represent a scalable strategy for immobilizing POMs on porous supports.
基金
financially supported by the Fundamental Research Funds for the Central Universities(No.2232018A3-04,No.2232018-02,and No.2232018G-043)
the Program of Introducing Talents of Discipline to Universities(No.105-07-005735)
