본 연구에서는 확산 화염반응기에 의한 초미립 TiO₂ 분말 입자 제조공정을 이론적/실험적으로 분석하였다. 모델식에서는 TiCl₄ 반응물 수지식, 에어로졸 동력학식을 고려하였으며 TiCl₄ 반응속도, TiO₂ 입자의 생성 및 충돌현상을 에어로졸 동력학식에 포함시켰다. 반응기 화염온도가 증가 할수록, 초기 TiCl₄ 농도가 증가할수록 또는 전체 기체유량이 감소할수록 생성된 TiO₂입자 크기는 증가하였다. 실험을 통해 제조된 TiO₂ 분말의 구조는 주로 anatase 형태로 나타났으며 전체기체 유량이 감소하거나 또는 반응기 화염온도가 증가할수록 TiO₂ 분말내의 rutile 함유량은 증가하였으나, 초기 TiCl₄ 농도와는 무관하였다. 반응기 최대 화염온도가 감소할수록 TiO₂ 입자의 비표면적은 증가하였다.

We have studied the process to prepare the ultrafine TiO₂ powders by a diffusion flame reactor, theoretically/experimentally. In model equations, the mass balance of TiCl₄ and the aerosol dynamic equation were considered. The effects. of TiCl₄ chemical reaction, generation and coagulation of TiO₂ particles were inclued in the aerosol dynamic equation. The TiO₂ particle size increases, as the flame temperature and the inlet TiCl₄ concentration increase of as the total gas flow rate decreases. The structure of TiO₂ particles in experiments was basically in anafase phase and amount of rutile phase in TiO₂ particles incerases as the maximum temperature increases, or as the total gas flow rate decreases. However, the amount of rutile phase in TiO₂ particles was almost indepentdent of the inlet TiCl₄ concentration. The specific area of TiO₂ particles increases, as the flame temperature decreases.

Ultrafime TiO₂ Particles Diffusion Flame Reactor Photocatalysts Aerosol Dynamic Equation Particle Characteristics

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