Homogeneously dispersed HPW/graphene for high efficient catalytic oxidative desulfurization prepared by electrochemical deposition.

Synthesis and Application of Heterogeneous Catalysts Based on Heteropolyacids for 5-Hydroxymethylfurfural Production from Glucose

“…This result indicates that HPW was well dispersed on the support surface, with no active phase agglomerations. 30,31]. Such result indicates that the Keggin structure has not been decomposed into WO 3 after calcination at 300 • C, which could occur for the active phase calcined at 500 • C. This result is in agreement with the thermogravimetry analysis results.…”

“…The crystalline structures of the support (Nb2O5), active phase (HPW), and catalyst (HPW/Nb2O5) calcined at 300 °C were evaluated by X-ray powder diffraction (XRD) (Figure 3). The XRD pattern of the HPW active phase showed typical diffraction peaks of a HPW Keggin structure at 10.3°, 20.7°, 23.1°, 25.4°, and 29.5° [30,31]. Such result indicates that the Keggin structure has not been decomposed into WO3 after calcination at 300 °C, which could occur for the active phase calcined at 500 °C.…”

3D-printing of integrated spheres as a superior support of phosphotungstic acid for deep oxidative desulfurization of fuel

“…The FT-IR spectrum of 3D-CSs exhibits that no evident peak was detected, indicating that there are almost no functional groups on the surface of the 3D-CSs. The FT-IR spectrum of 3D-CSs is similar to that of pure carbon materials [61] , illustrating that the 3D-PSs have been totally carbonized to 3D-CSs. Compared with FT-IR spectra of 3D-CSs and HPW, the characteristic peaks for Keggin structure of HPW were clearly explored.…”

Efficient biodiesel production from oleic acid using metal–organic framework encapsulated Zr-doped polyoxometalate nano-hybrids

“…. 26 In addition, the four typical peaks also were observed with some shi from ZrSiW/Fe-BTC and ZrSiW/UiO-66 nano-hybrids, this is probably due to the robust interaction between the Keggin unit and framework structure owing to the strong adsorption at the interface, 27 determining the ZrSiW molecules were embedded on MOFs matrix. Compared with Fe-BTC, the same absorption peaks (1636, 1585, 1454, 759, and 710 cm À1 ) of ZrSiW/Fe-BTC catalyst also was observed and related to the Fe-BTC framework structure.…”