应用ＴＧ、ＤＴＡ、ＩＲ、ＸＲＤ和ＣＯ２－ＴＰＤ等技术对用。ｃｅｌｌｕｌｏｓｅ吸附法合成Ｌａ０．８Ｓｒ０．２ＣｏＯ3（ＬＳＣＯ）粉体的过程机理进行了研究．发现在制备过程中ｃｅｌｌｕｌｏｓｅ首先起着一种金属离子吸附剂的作用．在焙烧的前期阶段，ｃｅｌｌｕｌｏｓｅ先被部分氧化而在其骨架上出现了羧酸基团，并与金属离子发生螫合形成螯合离子．优化条件下，在低温合成了纯相ＬＳＣＯ粉体．然而若焙烧过程中产生的ＣＯ２不能及时地排出，会导致体相中碳酸盐的形成,从而需要高于８００℃的再焙烧才能获得纯相的ＬＳＣＯ粉体．
The whole process of preparing La0.8Sr0.2CoO3 oxide powders by a cellulose adsorp-tion method was investigated by TG, DTA, XRD, and CO2-TPD
techniques. It was found that cellulose first acted as an adsorbent. During the initial stage of pyrolysis, the cellulose was partially oxidized, and some
carboxyl groups were formed in the cellulose texture, which was then complexed with the metal ions. At optimized condition, pure phase LSCO powder could be
acquired at low temperature. But, if the produced CO2 could not elute in time, carbonate would form during pyrolysis, and a calcined temperature higher than
800℃ was needed.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%