Production method of nanometer iron carbide powder

Abstract

The invention relates to a preparation method of nanometer iron carbide powder and belongs to the technical field of preparation of nanometer powder. The preparation method comprises the following technological steps: (1) mixing ferric nitrate, glycine and a carbon source at a certain ratio to form a solution; (2) heating, stirring, volatilizing, concentrating and decomposing the solution to obtain precursor powder; and (3) allowing the precursor powder to react for 0.5-3 hours in a certain atmosphere at the temperature of 500 to 800 DEG C. The preparation method disclosed by the invention is simple in process, low in cost and easy for industrial production, and the obtained iron carbide powder particles are smaller than 30nm in particle size and good in dispersity.

Description

technical field [0001] The invention belongs to the technical field of nano powder preparation, and in particular relates to a production method of nano iron carbide powder. Background technique [0002] Iron carbide is a metal compound with a complex orthorhombic structure, belonging to orthorhombic crystals, with a carbon content of 6.69%, a density of 7.694, and a melting point of 1837°C. In recent years, nano-iron carbide has attracted widespread attention from scientists for its excellent catalytic and magnetic properties. As a catalyst, nano-iron carbide is a good material for treating sewage and waste gas due to its advantages such as large specific surface area, high activity, corrosion resistance, good chemical stability, good selectivity, and strong adsorption capacity. In terms of clean energy production, nano-iron carbide can be applied to Fischer-Tropsch synthesis, which has the advantages of low price, moderate water-gas shift reaction activity, large operatin...

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Problems solved by technology

Xueqing Yue et al. (Powder Technol.2011(211):95–99) used high energy ball milling to prepare Fe 3 C particles, mixed sulfuric acid-treated expanded graphite powder and α-Fe powder at a ratio of 5:1, added to the ball mill, using ethanol as a lubricant, and obtained iron carbide after ball milling for 80-100 hours, the main disadvantage of this method The ball milling time is long, the production efficiency is low, and the wear of the grinding medium has a certain influence on the product purity.

Grimes etc. (JAppl.Phys.2000 (87): 5642-5644) adopt laser pyrolysis method to prepare Fe 3 C particles, as Fe(CO) 5 As a raw material, the precursor is decomposed into Fe powder under laser heating conditions, and the Fe powder and the injected C 2 h 4 reacted to give Fe 3 C particles, the main disadvantage of this method is that the raw material Fe(CO) 5 Toxic, and the price is high, the process equipment is complicated, the cost is high, and it is difficult to carry out large-scale production

Yang et al. (Chem.Res.Chinese Universities,2010(3):348-351) prepared Fe by chemical vapor deposition (CVD) 3 C particles, the Fe 4 N attached to the silicon plate, on the H 2 and CH 4 Heating and reacting under the atmosphere to prepare Fe with particles smaller than 100nm 3 C particles, the main disadvantage of this method is that the price of raw materials is relatively expensive, the cost is high, and the reaction needs to use a catalyst, and the separation of the product and the catalyst is difficult.

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