Preparation and Characterization of Composed Alumina-zirconia Nanoparticles by Supercritical Anti-solvent Process

The nanoparticles of Al(NO3)3-Zr(NO3)4 as the precursor of nano Al2O3-ZrO2 particulates were prepared by means of supercritical fluid antisolvents(SAS) process using CO2 as antisolvents and absolutely ethanol as solvent.The effects of temperature and pressure on the preparation process and the co-antisolvent effect of Al and Zr components in the precursor were investigated.The spherical Al2O3-ZrO2 nanoparticles were obtained via the calcination of Al(NO3)3-Zr(NO3)4.The nanoparticles and precursor were characterized by TG-MS,XRD,XPS,FEG-TEM and TPR.In addition,the reducing property of Al2O3-ZrO2 nanoparticles supported Ni was examined.Compared with the catalyst support prepared from conventional impregnation-precipitation method,Ni could be dispersed better on the Al2O3-ZrO2 nanoparticles prepared from SAS.It suggests that the nano-particulates prepared from SAS can be a promising candidate for catalyst support.