Pyrohydrolysis of SmF3 in moist air
Peng, J; Zheng, XB; Qiu, TT; Gao, SZ; Liu, YX; Zhang, L
2017
发表期刊JOURNAL OF FLUORINE CHEMISTRY
ISSN0022-1139
卷号193页码:106-112
文章类型期刊论文
摘要In order to prove the feasibility of pyrohydrolysis method of fluorides in TMSR spent fuel reprocessing, pyrohydrolysis behavior and reaction mechanism of neutron poison represented by SmF3 in moist air, have been studied by means of thermogravimetric analysis (TG). Then, reaction products in solid state Were characterized by means of XRD and SEM. The results indicated that SmF3 began to hydrolyze in 773 K. Two definite breaks on TG curves were correlated to the conversions of SmF3 into SmOF and SmOF into Sm2O3, respectively. Through the simulation calculation, we found that the two stages of the reaction can both meet the second-order reaction kinetics, and their corresponding activation energies are 60.2 and 31.2 kJ/mol, respectively. From the results of dynamics simulation, the rate equation obeyed the phase boundary rate law, which was expressed by [1 - (1 - x)(1/3)] = kt. Further studies indicated that the rate-determining step was the surface reaction control, and the shrinking core model was applied to describe the mechanism. These results showed that pyrohydrolysis method of fluorides could be used for fuel reprocessing due to its unique reaction mechanism. (C) 2016 Elsevier B.V. All rights reserved.
关键词Smf3 Pyrohydrolysis Thermogravimetry Reaction Mechanism Kinetics
DOI10.1016/j.jfluchem.2016.11.011
收录类别SCI
语种英语
WOS记录号WOS:000392044400015
引用统计
文献类型期刊论文
条目标识符http://ir.sinap.ac.cn/handle/331007/27424
专题中科院上海应用物理研究所2011-2018年
推荐引用方式
GB/T 7714
Peng, J,Zheng, XB,Qiu, TT,et al. Pyrohydrolysis of SmF3 in moist air[J]. JOURNAL OF FLUORINE CHEMISTRY,2017,193:106-112.
APA Peng, J,Zheng, XB,Qiu, TT,Gao, SZ,Liu, YX,&Zhang, L.(2017).Pyrohydrolysis of SmF3 in moist air.JOURNAL OF FLUORINE CHEMISTRY,193,106-112.
MLA Peng, J,et al."Pyrohydrolysis of SmF3 in moist air".JOURNAL OF FLUORINE CHEMISTRY 193(2017):106-112.
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