单分子层复合微粉研究

STUDY OF MONOLAYER DISPERSION COMPOSITE POWDERS

研究了ＣｅＯ２／γ－Ａｌ２Ｏ３单分子层复合微粉的制备机理。研究结果说明，ＣｅＯ２可以在γ－Ａｌ２Ｏ３表面形成单层分散相，可以通过浸渍、焙烧的方法制备ＣｅＯ２／γ－Ａｌ２Ｏ３单分子层复合微粉；ＣｅＯ２起始物的种类对其单层分散阈值（最大单层分散容量）有影响，以硝酸亚铈为起始物的ＣｅＯ２／γ－Ａｌ２Ｏ３复合微粉的ＣｅＯ２单层分散阈值为０．０４２ｇＣｅＯ２／ｇ（γ－Ａｌ２Ｏ３），而以醋酸亚铈为起始物的ＣｅＯ２单层分散阈值则为０．１０ｇＣｅＯ２／ｇ（γ－Ａｌ２Ｏ３）。

The CeO 2/γ Al 2O 3 composite powder has been studied. The experimental results showed that the CeO 2 can disperse spontaneously onto the surface of γ Al 2O 3 to form a monolayer, and the CeO 2/γ Al 2O 3 monolayer dispersion composite powder could be prepared by impregnating γ Al 2O 3 in a cerium salts solution and followed by drying and calcining the impregnated samples. The monolayer dispersion threshold of composite powder changed by the cerium salts solution, which should be 0.042 g/g ( γ Al 2O 3) for the composite powder prepared from Ce(NO 3) 3 solution and 0.10 g/g ( γ Al 2O 3) for that prepared from Ce(Ac) solution.