The fluorination of UF₄ by NF₃ at different temperatures was investigated using in-line Fourier transform infrared (FTIR) spectroscopy. The results indicated that the fluorination between NF₃ and UF₄ occurred only when the temperature was above 723 K, and the temperature had a significant effect on the average reaction rate and the utilization rate of NF₃. The in-line FTIR spectrum analysis and thermodynamic calculation indicated that UF₄ was converted to UF₆ with the following reaction mechanism: 2/3NF₃(g) + UF₄(s) = UF₆(g) + 1/3N₂(g). The conversion rate of UF₄ to UF₆ increased from 1.53 to 2.68 gU•h^-1 and the utilization rate of NF₃ increased from 10.5% to 22.5% when the reaction temperature increased from 723 K to 873 K. The calculated rate constant increased from 1.6 × 10^-2 to 3.1 × 10^-2 min^-1 in the range of 723 K to 873 K, and the activation energy of the reaction was 22.56 kJ/mol.

使用在线傅立叶变换红外（FTIR）光谱研究了在不同温度下NF ₃对UF ₄的氟化作用。结果表明，仅当温度高于723 K时，NF ₃和UF ₄之间才发生氟化反应，该温度对NF ₃的平均反应速率和利用率有显着影响。在线FTIR光谱分析和热力学计算表明，UF ₄通过以下反应机理转化为UF ₆：2 / 3NF ₃（g）+ UF ₄（s）= UF ₆（g）+ 1 / 3N ₂（G）。当反应温度从723 K增加到873 K时，UF ₄转化为UF ₆的转化率从1.53增加到2.68 gU•h ^-1，NF ₃的利用率从10.5％增加到22.5％。计算的速率常数增加在723 K至873 K的范围内，从1.6×10 ^-2到3.1×10 ^-2 min ^-1，反应的活化能为22.56 kJ / mol。