【摘要】 催化剂全部采用共沉淀法制备，通过差热分析、热重分析对催化剂焙烧过程的热变化和质量变化加以分析，从而获得催化剂焙烧过程的化学反应情况－ 并采用Ｘ 射线衍射、透射电镜和选区电子衍射对催化剂的物种情况及形貌加以研究，发现稀土助剂的加入使载体的晶体结构发生变化，从而使载体表面改性，抑制了ＮｉＡｌ２Ｏ４ 的生成，提高了ＮｉＯ的分散度－ 而且发现有Ｌａ２Ｏ２ＣＯ３ 晶体存在于载体表面，Ｌａ２Ｏ３ 以高度分散的状态存在－更多还原

【Abstract】 The catalysts were prepared by coprecipitation method.The calcination of these samples were studied by thermogravitry and differential thermal analysis and their structures were examined by X ray diffraction.The catalysts were characterized by transmission electron microscopy and their structures determined by electron diffraction.The results showed that the structures of the catalysts were changed by the presence of La 2O 3.The production of NiAl 2O 4 was inhibited and the disperse degree of NiO was increased. The La 2O 2CO 3 crystal was found and La 2O 3 highly dispersed on the surface of the catalyst.更多还原