Synthesis of adamantane over PW/C catalyst

Supported heteropoly acid catalysts of PW/C were prepared by impregnation at room temperature.Their physicochemical properties such as the dispersion of PW,specific surface area,pore structure and acidity were characterized by X-ray diffraction(XRD),temperature programmed desorption of ammonia(NH3-TPD),infraredray spectrum(FTIR).The catalytic performances of the supported acid catalysts in the isomerization of endo-tetrahydrodicyclopentadiene(endo-TCD) were investigated in a batch reactor.The relations between the physicochemical properties of the catalysts and their activity had been discussed.Under optimal conditions: the PW loading was 30% by weight,the activation temperature of catalyst was 250 ℃,the reaction temperature was 240 ℃,the reaction time was 3 hours,the mass ratio of catalyst and material was 0.6∶1.0,the initial pressure was 1.1 MPa,the molar ratio of cyclohexane and endo-TCD was 5∶1.The maximum yield of adamantane(ADH) with PW/C was up to 21.6%.