Process optimization and preparation of ferric oxide nanoparticles by homogeneous precipitation method

摘要

For the purpose of developing an effective Fe_2O_3-doped nickel-based catalysts to be used in biomass gasification, Fe_2O_3 nanoparticles were prepared by homogeneous precipitation method involving an aqueous solution of Fe (NO_3)_3·9H_2O and urea as precipitator. Different approaches, such as XRD and SEM, were used to characterize the products. Meanwhile, the effects of various technical parameters in preparation process on the yield of products were investigated, and optimal conditions for preparing Fe_2O_3 nanoparticles were found as follows: the molar ratio of urea to Fe(NO_3)_3·9H_2O for 5:1, temperature of precipitation reaction for 125°C, concentration of iron salt for 0.20mol/L. The Fe_2O_3 nanoparticles prepared under the optimal conditions were spherical in shape and well dispersed; they had high purity and a fine crystal phase of cubic syngony with a mean particle size of about 28nm.