Immobilization Na7PW11O39 on quanternary ammonium functionalized chloromethylated polystyrene by electrostatic interactions: An efficient recyclable catalyst for alcohol oxidation

• Na7PW11O39 was successfully immobilized and finely dispersed on DMA16/CMPS.
• PW11-DMA16/CMPS exhibited high activity and stability for alcohol oxidation.
• A promising method for the construction of POMs and mesoporous-macropores hybrid.

Na7PW11O39 (PW11) was immobilized on quanternary ammonium functionalized chloromethylated polystyrene (DMA16/CMPS) in a facile method and used as efficient recyclable catalyst in oxidation of alcohol. Commercially available mesopores and macropores CMPS was quaternized by N, N- dimethylhexadecylamine (DMA16) followed by immobilization of PW11 onto the pore of CMPS by electrostatic interaction. The synthesized catalyst was characterized by Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), thermo gravimetric analyzer (TGA), ultraviolet–visible (UV–vis), N2 adsorption–desorption, X-ray photoelectron spectroscopy (XPS), zeta potential, contact angle, 31P nuclear magnetic resonance (31P NMR), scanning electron microscope (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). The results indicated that Na7PW11O39 was successfully immobilized by electrostatic interaction and finely dispersed on quaternary ammonium functionalized CMPS. PW11-DMA16/CMPS showed a similar catalytic activity to that of homogeneous PW11, which was attributed to the hydrophobic nature of the PW11-DMA16/CMPS and facile diffusion of reactant to the active sites provided by widely opened mesopores and macropores. The present approach provides a promising and universal strategy for the construction of hybrid catalysts based on POMs and mesopores and macropores materials.

Na7PW11O39 (PW11) immobilized on quanternary ammonium functionalized chloromethylated polystyrene (CMPS) was synthesized in a facile method. PW11-DMA16/CMPS exhibited a considerable catalytic activity in selective oxidation of cyclohexanol with 30% H2O2, which is similar to that of homogeneous PW11. Moreover, PW11-DMA16/CMPS also showed excellent catalytic activity in oxidation of various alcohols.Figure optionsDownload high-quality image (94 K)Download as PowerPoint slide