Method and device for manufacturing metal oxide particles

Abstract

Disclosed is a method for manufacturing decahedral titanium oxide particles by introducing a reaction gas into a reaction tube having a partial double-tube structure, wherein a hollow inner tube is inserted into an upstream section of a hollow outer tube. The manufacturing method for decahedral titanium oxide particles is characterized in that the aforementioned reaction gas, which contains titanium tetrachloride, is introduced into the aforementioned hollow inner tube, and while a barrier gas containing no metal chloride is introduced between the aforementioned hollow inner tube and the aforementioned hollow outer tube, the aforementioned reaction gas and the aforementioned barrier gas are preheated upstream from the downstream end of the aforementioned hollow inner tube, the aforementioned reaction gas undergoes main heating in a region at a distance downstream from the downstream end of the aforementioned hollow inner tube, and the aforementioned titanium tetrachloride is pyrolized.

Description

technical field [0001] The present invention relates to a method and an apparatus for producing decahedral titanium oxide particles. This application claims priority based on Japanese Patent Application No. 2008-266675 filed in Japan on October 15, 2008, the content of which is incorporated herein. Background technique [0002] In recent years, titanium oxide particles have attracted attention as photocatalysts, and researches have been conducted on their production methods. For example, Patent Documents 1 and 2 and Non-Patent Document 1 disclose titanium oxide particles having a decahedral box shape mainly containing anatase crystals (hereinafter referred to as "decahedral titanium oxide particles") and their production methods. It is described that the decahedral titanium oxide particles have high activity as a photocatalyst because of their large surface area per unit mass, high crystallinity, and few internal defects. Furthermore, it is described in Non-Patent Document...

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Problems solved by technology

[0007] As described above, in the methods for producing decahedral titanium oxide particles disclosed in Patent Documents 1 and 2 and Non-Patent Document 1, there is a problem that a large amount of film-like products adhere to the inner wall surface of the reaction tube, and the productivity of the decahedral titanium oxide particles is low.

[0008] Furthermore, if the above-mentioned reaction is continued in the state where the above-mentioned film-like product is attached to the inner wall surface of the reaction tube, the film-like product will become easier to generate as a result, and the decahedral titanium oxide particles in the powder product will gradually the ratio of

[0009] In addition, in this production method, not only in the case of producing decahedral titanium oxide particles, but also in the case of synthesizing titanium oxide particles, the same result occurs, and there is a case where 50% or more of the product in the above-mentioned reaction region adheres as a film-like product. Problems on the inner wall surface of the reaction tube

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