THE EFFECTS OF TEMPERATURE ON PARTICLE-SIZE IN THE GAS-PHASE PRODUCTION OF TIO2
THE EFFECTS OF TEMPERATURE ON PARTICLE-SIZE IN THE GAS-PHASE PRODUCTION OF TIO2
复制标题
DOI：
10.1080/02786829508965337
复制
发表时间：
1995-11-01
影响因子：
5.2
通讯作者：
JEONG, J
中科院分区：
文献类型：
--
作者：
JANG, HD;JEONG, J
在多级气溶胶反应器中，采用四氯化钛气相氧化法制备了超细二氧化钛粉体。反应器由三个区域组成：TiCl4的蒸发区，氧气和汽化四氯化钛的预热区和反应区。选取反应物预热温度、反应物分压和反应区温度作为实验变量，控制颗粒大小和分布。制备了平均粒径为30 ~ 70 nm的超细TiO2粉体。研究发现，反应物的预热温度是影响超细粉体粒度和分布的重要因素。随着预热温度的升高，平均粒径变小，粒径分布更加均匀。在预热温度控制下，随着TiCl4摩尔分数的增加，生成的颗粒较大，粒径分布窄。而O-2摩尔分数的变化对平均粒径的影响不大。随着反应区温度的升高，平均粒径变小。随着反应物在反应区内停留时间的缩短，得到的颗粒越小。
Ultrafine titanium dioxide powder was synthesized by the gas-phase oxidation of titanium tetrachloride in a multistage aerosol reactor. The reactor consisted of three zones: an evaporation zone for TiCl4, a preheating zone for oxygen and vaporized titanium tetrachloride, and a reaction zone. Preheating temperature of reactants, partial pressure of reactants, and temperature in the reaction zone were chosen as experimental variables for the control of particle size and distribution. Ultrafine TiO2 powders ranging from 30 to 70 nm in average particle sizes were produced. The preheating temperature of reactants was found to be an effective factor for particle size and distribution of ultrafine powders. As the preheating temperature was increased, average particle size became smaller and size distribution more uniform. Larger particles having narrow size distributions were produced with an increase in TiCl4 mole fraction under the control of preheating temperature. However, variation of O-2 mole fraction did not show much difference on the average particle size. As the temperature in the reaction zone was increased, average particle size became smaller. With the decrease in the residence time of reactants in the reaction zone smaller particles were obtained.