高温氧化合成纳米TiO_2-Al_2O_3复合粒子

PREPARATION OF NANOSIZED TiO_2-Al_2O_3 COMPOSITE PARTICLES BY HIGH TEMPERATURE OXIDATION IN AEROSOL REACTOR

在气溶胶反应器中，利用四氯化钛（ＴｉＣｌ４）和三氯化铝（ＡｌＣｌ３）高温氧化制备纳米 ＴｉＯ２－ Ａｌ２Ｏ３复合粒子，采用 ＥＤＳ、 ＸＰＳ、 ＴＥＭ、 ＸＲＤ分析粒子化学组成、形貌、大小和晶型等；研究 了 ＡｌＣｌ３与ＴｉＣｌ４的摩尔比、反应温度等因素对粒子形态的影响，结果表明，复合粒子形貌较纯 ＴｉＯ２ 更为圆整、平均晶粒尺寸随 ＡｌＣｌ３浓度增加而减小；粒子粒径随反应温度升高而增大； ＡｌＣｌ３与 ＴｉＣｌ４的摩尔比影响粒子中 Ａｌ２Ｏ３和 ＴｉＯ２的晶型，当 ＡｌＣｌ３与 ＴｉＣｌ４的摩尔比为 ２．

Nanosized TiO2-Al2O3 composite particles were prepared by gas-phase oxidation. of TiCl4 and AlCl3 in an aerosol reactor. The measurement of XPS, TEM, EDS, XRD were used to characterize the chemical composition, morphology, size and crystal structure of the particles. The effect of TiCI4, AIC13 feed ratio and reaction temperature on the characteristics of composite particles was studied. The addition of AlC13 altered the particle morphology from polyhedral to spherical, the average grain size decreased with increasing AlCl3 and TiCl4 feed ratio, and the particle size increased with increasing reaction temperature. The crystal structure of titania and alumina in composite particles was affected by the AlCl3 and TiCl4 feed ratio. Aluminum titanate was formed at 1400℃ when TiCl4 and AlCl3 feed ratio was 2.80.