Preparation of Keggin-type mono-lacunary phosphotungstic-ammonium salt and its catalytic performance in ammoximation of cyclohexanone

The mono-lacunary phosphotungstic ammonium salt (NH4)7PW11O39 and its two substituted compounds, including (NH4)5ZrPW11O39 and (NH4)5(ZrO2)PW11O39 were synthesized and their catalytic application in ammoximation of cyclohexanone were presented for the first time. FT-IR, UV-Vis, TG-DSC, and X-ray diffraction as well as cyclic voltammetry (CV) were used to characterize the structure of the aimed sample and their reusability were also discussed.