高温气相反应合成金红石型纳米TiO_2颗粒的研究

PREPARATION OF NANOMETER RUTILE TiO2 PARTICLES BY HIGH TEMPERATURE GAS-PHASE REACTION

在高温气相反应器中，利用掺 ＡｌＣｌ３的 ＴｉＣｌ４氧化反应制备金红石型纳米 ＴｉＯ２颗粒研究了氧气预热温度、反应器尾部氮气流量、反应温度、停留时间等对 ＴｉＯ２颗粒大小的影响结果表明：提高氧气预热温度和加大反应器尾部氮气流量对控制产物粒径有利， ＴｉＯ２粒径随反应温度升高和停留时间延长而增大当反应温度为１３７３Ｋ， ＡＩＣｌ３与ＴｉＣｌ４摩尔比为 ０．２５、停留时间为１．７３ｓ时，纯金红石相纳米ＴｉＯ２颗粒的粒径分布为 ３０－５０ｎｍ．

Nanometer rutile titania particles were synthesized by the gas-phase oxidation of titanium tetrachloride and aluminum trichloride in a high temperature gas phase reactor. The effect of oxygen preheating temperature To2 nitrogen flow rate Qw into reactor tail, reaction temperature T and residence time t on TiO2 particle size was studied. The result showed that the enhancement of oxygen preheating temperature and nitrogen flow rate into reactor tail is benefit for controlling the particle size, and the TiO2 size increases with increasing reaction temperature or residence time. When t=1.73 s, T=1373 K, To2=1143 K, Qw=0.036 m3/h, and Xinlet=0.25, the TiO2 particles synthesized is pure rutile phase, and the size distribution is from 30 nm to 50 nm.