Applied Catalysis A: General p. 84 - 91 (2014)
Update date:2022-08-11
Topics:
Li, Kaige
Wang, Jing
Zou, Yongcun
Song, Xiaojing
Gao, Hongcheng
Zhu, Wanchun
Zhang, Wenxiang
Yu, Jihong
Jia, Mingjun
The Keggin-type polyoxometalates (POMs) including phosphotungstate and Ti-substituted phosphotungstates were supported on zirconia (ZrO2) matrix by a surfactant-assisted sol-gel copolymerization technique. The resultant ZrO2 supported POMs composite materials (ZrO 2-POMs) were characterized by X-ray power diffraction, transmission electron microscopy, Fourier transform infrared spectra, diffuse reflectance ultraviolet-visible spectra, thermogravimetry-differential scanning calorimetry analysis, and 31P magic angle spinning (MAS) nuclear magnetic resonance (NMR) analysis. The results showed that the ZrO2-POMs materials have worm-like disordered mesoporous, and the primary structure of POMs is preserved after the formation of the composite materials. All the ZrO2-POMs materials are catalytically active for the H 2O2-mediated oxidation of cyclohexene with relatively high selectivity to allylic oxidation products. Moreover, these materials exhibit high stability against leaching of active species, and can be easily recycled without obvious loss of activity and selectivity. The existence of relatively strong interaction between the POM units and the ZrO2 framework should play important role in fabricating the stable heterogeneous ZrO 2-POMs catalysts.
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