Abstract: Supported ammonium phosphotungstate catalyst was prepared by sol-gel method and characterized by X-ray diffraction(XRD) and IR spectra,and catalytic activity of catalyst in nitration of benzene was tested. Experiments results indicated that supported catalyst still presented the Keggin structure of ammonium phosphotungstate catalyst and exhibited high nitration reaction catalytic activity and high selectivity to mononitrobenzene. The best yield rate was obtained under reaction conditions as follows:the volu...