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核技术  2015 

CeO2/NaF吸附剂的制备及其对MoF6的吸附性能研究

DOI: 10.11889/j.0253-3219.2015.hjs.38.100301, PP. 100301-100301

Keywords: NaF,吸附剂,CeO2掺杂,MoF6,热重分析

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Abstract:

将作为粘结剂和造孔剂的高分子羧甲基纤维素钠(Carboxymethylcellulose,CMC)、CeF3和NaF按4:9:62的质量比例混合,再加一定量的水(CMC与水的比为1:6),通过混捏、成形和烧结等程序制得了一种新型的CeO2/NaF吸附剂颗粒。通过研究CeO2的掺杂对NaF吸附剂表观性质和吸附性能的影响发现:CeO2/NaF吸附剂的比表面积为(0.84±0.04)m2·g?1,是相同条件下制得的NaF吸附剂的两倍以上;孔隙率为42.2%,也优于NaF吸附剂;CeO2/NaF和NaF吸附剂对MoF6的饱和吸附容量相当,但CeO2/NaF吸附剂的初始吸附速率明显大于NaF吸附剂;吸附于CeO2/NaF吸附剂上的MoF6在150–300°C单个温度段解吸附,而吸附于NaF吸附剂上的MoF6在100–300°C和350–400°C两个温度段发生解吸,表明CeO2的引入在一定程度上起到了稳定MoF6的作用。在NaF吸附剂内掺杂CeO2可以改变NaF吸附剂部分表观性质,从而改善NaF的吸附性能。

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