在内径４０ｍｍ的流化床反应器中，利用ＳｎＣｌ＿４气相水解反应，制备了超细Ａｌ＿２Ｏ＿３－ＳｎＯ＿２复合粒子。通过ＸＲＤ，ＥＰ－ＭＡ，ＨＲＥＭ等现代化分析手段确定了产物中ＳｎＯ＿２的晶型及其在Ａｌ＿２Ｏ＿３团聚物中和在Ａｌ＿２Ｏ＿３原生颗粒表面的分散包敷形态。研究结果表明：３００℃下制备的产物中ＳｎＯ＿２呈无定态，经８００℃热处理２ｈ，ＳｎＯ＿２转化成金红石型，产物中ＳｎＯ＿２均匀分散于整个Ａｌ＿２Ｏ＿３团聚物中；１００℃下制备的产物中ＳｎＯ＿２以薄膜形式包敷在超细Ａｌ＿２Ｏ＿３颗粒表面；４５０℃下制备的产物中，ＳｎＯ＿２以６～１０ｎｍ的粒子形式淀积在Ａｌ＿２Ｏ＿３表面。 In a fluidized bed reactor with an inner diameter of 40 mm, ultrafine Al 2 O 3 -SnO 2 composite particles were prepared by vapor phase hydrolysis of SnCl 4. The crystal forms of SnO 2 and their dispersed inclusions in Al 2 O 3 agglomerates and on the surface of Al 2 O 3 primary particles were confirmed by modern analysis methods such as XRD, EP-MA and HREM. The results show that SnO 2 is amorphous at 300 ℃, SnO 2 is converted into rutile by heat treatment at 800 ℃ for 2 h, and SnO 2 is uniformly dispersed in the Al 2 O 3 aggregate. The SnO 2 In the product prepared at 450 ℃, SnO 2 is deposited on the surface of Al 2 O 3 as 6 ~ 10nm particles.