钒氧化物纳米管负载钯纳米颗粒的合成、表征及其在Heck反应中的应用

Vanadium oxide nanotubes (VOx-NTs) was synthesized by hydrothermal treatment of V2O5 and hexadecylamine, then the VOx-NTs supported palladium nanoparticles (Pd-NPs/VOx-NTs) was synthesized by ion exchange of VOx-NTs and reduction of formaldehyde, and the synthetic mechanism of Pd-NPs/VOx-NTs was inferred. The Pd-NPs/VOx-NTs was characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD), which indicated that the Pd-NPs grew mainly along the (111) direction and was well dispersed in the end of VOx-NTs with sizes ranging from 1-6 nm. The Pd-NPs/VOx-NTs was used as catalyst for Heck reactions and exhibited excellent catalytic activity. Poor performance in reusability was attributed to the denudation of VOx-NTs by solvent and chemical denudation of Pd-NPs during the catalytic process.