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

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(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.