中文摘要：

为研制生物质气化用纳米氧化铁掺杂的镍基催化剂，以硝酸铁为原料、尿素为沉淀剂，采用均匀沉淀法制备了纳米氧化铁，并利用X射线衍射仪（XRD）、扫描电镜（SEM）对产品性能进行了表征。同时，探讨了制备条件对氧化铁产品产率的影响，得出了最佳工艺条件：尿素与硝酸铁物质的量比为5：1，沉淀反应温度为125℃，铁盐浓度为0．20mol／L。最佳条件下所得纳米氧化铁粒子呈球形，分散性好，纯度较高，属立方晶系结构，平均粒径约为28nm.

英文摘要：

For the development of Fe2O3 -doped nickel-based catalysts to be used in biomass gasification, nano-sized Fe2O3 were prepared by homogeneous precipitation method with ferric nitrate [ Fe （NO3）3 · 9H2O] as raw material and with urea as precipitator. Different approaches, such as XRD and SEM, were used to characterize the products. Meanwhile, effects of various technical parameters in preparation process on the yield of products were investigated, and optimal conditions were found for preparing nano-sized Fe2O3 ,which were as follows：molar ratio of urea to Fe（ NO3 ） 3 · 9H2O was 5： 1, temperature of precipitation reaction was 125℃, concentration of iron salt was 0.20 mol/L. The 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 28 nm.