Search

Novel copper pyrovanadate (Cu2V2O7)‐Al2O3 spherical beads were prepared by alginate‐assisted sol–gel method using ammonium vanadate, copper nitrate, and pseudo boehmite as precursors, characterized by X‐Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission electron microscope (TEM), X‐ray Photoelectron Spectroscopy (XPS), Brunner−Emmet−Teller (BET), X‐Ray Fluorescence (XRF) and nitrogen adsorption–desorption technologies and used as catalysts for the selective oxidation of 5‐hydroxymethylfurfural (HMF) to 2,5‐diformylfuran (DFF). The effects of calcination temperature on catalyst structure, morphology, and catalytic activity were investigated. The results showed that the formation of Cu2V2O7 crystalline phase at a high temperature can improve the catalyst activity significantly. Under the optimal reaction conditions, Cu2V2O7‐Al2O3‐700 exhibited an HMF conversion of 99.9% and DFF selectivity of 99.8%, respectively. After a five‐run recycling test, the activity of the catalyst can remain about 80%. Highlights: Cu2V2O7 was used as catalysts for aerobic oxidation of HMF into DFF.Alginate‐assisted sol–gel method improved interaction between Al2O3 and Cu2V2O7.Cu2V2O7‐Al2O3 beads with 1.8‐mm diameter showed good industrial application potential. [ABSTRACT FROM AUTHOR]

Purpose This paper aims to study the anodization of aluminum in a mixture solution of 1,3-propanediol solutions and 0.4 mol l−1 H3PO4 at a low temperature.Design/methodology/approach The morphology and composition of the resulting anodic aluminum oxide (AAO) template was characterized by means of a scanning electron microscope in combination with an energy dispersive spectrometer.Findings Pore density and pore diameter both were found to be dependent on the temperature of anodization.Originality/value The resulting AAO templates exhibited uniform and regular pores with diameters that were significantly smaller than those found in AAO templates anodized at room temperature. [ABSTRACT FROM AUTHOR]

Purpose This paper aims to study the anodization of aluminum in a mixture solution of 1,3-propanediol solutions and 0.4 mol l−1 H3PO4 at a low temperature.Design/methodology/approach The morphology and composition of the resulting anodic aluminum oxide (AAO) template was characterized by means of a scanning electron microscope in combination with an energy dispersive spectrometer.Findings Pore density and pore diameter both were found to be dependent on the temperature of anodization.Originality/value The resulting AAO templates exhibited uniform and regular pores with diameters that were significantly smaller than those found in AAO templates anodized at room temperature. [ABSTRACT FROM AUTHOR]