低温化学气相合成氧化钛超细粒子

PRODUCTION OF ULTRAFINE TiO_2 PARTICLESBY VAPOR PHASE HYDROLYSIS OF Ti(OC_4H_9)_4 AT LOWER TEMPERATURE

氧化钛超细粒子具有很高的化学活性、良好的耐侯性和耐化学腐蚀性等，可。良的光催化剂、催化剂载体或吸附剂，也是功能陶瓷、高级油漆及涂料的主要尿合成方法有液相法和气相法。液相法中最有代表性的是金属醇盐水解法［，’］。气。TIC14氧化怯L’】该法原料易得，产品粒度细，单分散性好，但反应温度高且副产品作者将金属醇盐水解反应移植至气相，利用亚微米级的金属醇盐气溶胶同水蒸气。

Metal alkoxide hydrolysis was conducted into a vapor phase reactor. A hot nitro-gen flow in a mixing chamber carrying Ti (OC4H9)4 vapor, was mixed with a cold nitrogen low in a mixing chamber to generate submicron droplets. The droplets were hydrolysed with vater vapor at lower temperature to synthesize TiO2 ultrafine particles of high purity andnarrow size distribution. A mathematical model of perfectly mixed reactors (CSTR) in series was developed which was able to predict mean particle size as a function of operating conditions. Particle size was experimentally and theoretically found dependent on both fluid dynamic and thermodynamic conditions.