CeO_(2)和H_(2)16O中氧同位素置换反应研究  

Study on oxygen isotope exchange reaction between CeO_(2) and H_(2)16O

作　　者：韩军[1] 马浚[1] 龙开明[1] 向永春[1] 郝樊华[1] HAN Jun;MA Jun;LONG Kai-ming;XIANG Yong-chun;HAO Fan-hua(Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《化学研究与应用》2022年第8期1906-1911,共6页Chemical Research and Application

摘　　要：为了降低^(238)PuO_(2)的中子发射率,制备出满足要求的放射性同位素热源材料,采用CeO_(2)模拟^(238)PuO_(2)进行氧同位素置换反应实验研究,确定了氧同位素置换工艺的最佳参数。实验结果表明,H_(2)^(16)O和CeO_(2)氧同位素置换最适宜的温度为700℃,置换反应平衡时间为15 min,置换次数为15次,压力对置换反应影响较小。置换后的CeO_(2)样品中^(18)O丰度由0.204%下降至0.026%,最大置换率达到89.7%。In order to reduce the neutron emissivity of ^(238)PuO_(2) and prepare qualified radioisotope heat source materials,CeO_(2) was used to simulate ^(238)PuO_(2) for the experimental study of oxygen isotope exchange reaction,and the optimal parameters of the oxygen isotope exchange process were determined.The experimental results show that the most suitable temperature for the exchange of oxygen isotopes between H_(2)^(16)O and CeO_(2) is 700℃,the exchange reaction equilibrium time is 15 min,the exchange times are 15 times,and the pressure has little effect on the exchange reaction.The abundance of ^(18)O in the exchanged CeO_(2) samples decreased from 0.204% to 0.022%,and the maximum exchange rate reached 89.7%.

关 键 词：CeO_(2) H_(2)16O 氧同位素置换 

分 类 号：O614.3[理学—无机化学]