Preparation of Iron Ultra Fine Particles and its Application as Catalyst for Conversion of Organic Resources

(1)超细颗粒（UFP）的制备本项目旨在利用钢铁加工废酸作为铁源。在氯化铁溶液中加入酸或碱，沉淀出氧化铁、Fe_2O_3或FeOOH。通过控制盐浓度、沉淀剂、温度和时间，得到单分散UFP， FeOOH为0.05 μ m， Fe_2O_3为0.1 μ m。后者的比表面积为3m ^2/g。(2) UFP的粒度分类提出了一种新的粒度分类方法，并进行了试验。通过调节离子强度和pH值，电泳速度取决于颗粒的大小。这可以应用于分类。(3)煤的催化气化作为UFP在资源转化中的应用，对煤特别是褐煤进行了催化气化。粒径为0.1 μ m的UFP效果不佳。通过将UFP沉淀到煤颗粒上，发现催化气化以相当高的速率进行。(4) CO_2与CH_4转化催化剂。用铁UPF催化C0_2与CH_4反应生成CO和C_2烃。UFP对CO_2的转化率高于普通氧化铁，从而验证了其作为CO_2转化催化剂的有效性。(5)新型催化剂UFP：将铁UFP在液相中浸渍镍，制备出非晶镍在Fe_20_3表面分散的催化剂。该催化剂在搅拌床反应器中起加氢作用。

(1) Preparation of Ultrafine Particles (UFP) In this project, utilization of waste acid from steel processing was aimed as the iron source. Acid or alkali was added to a ferric chloride solution to precipitate iron oxide, Fe_2O_3 or FeOOH. By controlling the concentration of the salt, precipitator, temperature, and time, monodispersed UFP's, 0.05 mum for FeOOH and O. l mum for Fe_2O_3 were obtained. The latter had a specific surface area of 3 m^2/g.(2) Size Classification of UFP A new method of size classification was proposed and tested, using the electropheresis. By adjusting the ionic strength and pH, the speed of phoresis was seen to depend on the size of the particles. This can be, applied for classification.(3) Catalytic Gasification of Coals As an application of UFP so obtained for conversion of resources, catalytic gasification of coals, especially brown coals was conducted. UFP's of 0.1 mum in particle size were not so effective. By precipitating UFP onto coal particles, catalytic gasification was found to proceed at fairly high rate.(4) Catalyst for CO_2 conversion with CH_4. The iron UPF was used to catalyze the reaction of C0_2 with CH_4 to produce CO and C_2 hydrocarbons. The UFP yielded higher conversion of C0_2 than usual iron oxide, thus verified the usefulness as CO_2 conversion catalyst.(5) New Catalyst Using UFP The iron UFP was impregnated with nickel in liquid phase, resulting a catalyst in which amorphaous nickel is finely dispersed over Fe_20_3 surface. The catalyst was found to serve as a hydrogenation in a stired bed reactor.