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| 高分散态铀氧化物对硝酸钾热分解的催化作用 |
| Catalytic effect of highly dispersed state uranium oxides on the thermal decomposition of potassium nitrate |
| 投稿时间：2024-03-03 修订日期：2024-03-28 |
| DOI： |
| 中文关键词: 硝酸钾 铀氧化物 动力学参数 活化能 指前因子 |
| 英文关键词:potassium nitrate uranium oxide kinetic parameter activation energy prefactor |
| 基金项目:国家自然科学基金资助项目(22272074) |
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| 中文摘要: |
| 以SBA-15为载体，通过水热法制得高分散态的铀氧化物，而后引入KNO3。基于程序升温分解-质谱(temperature programmed decomposition-mass spectrometry, TPDE-MS)联用技术，研究了KNO3的热分解行为。利用KAS方法和F1/3方法分析了KNO3热分解数据，得出相应的动力学参数。结果表明：纯KNO3在600℃左右开始发生分解，分解率位于0.5~0.8时，其分解反应符合F1/3方法模型函数，反应活化能为285 kJ/mol；高分散态铀氧化物上，KNO3分解温度降低至200℃，分解活化能在205.4~207.3 kJ/mol之间。铀氧化物对KNO3具有良好的催化活性，使得KNO3热分解的平均活化能降低72 kJ/mol。 |
| 英文摘要: |
| High Dispersed Uranium oxides were obtained by hydrothermal method using SBA-15 as a carrier, and later introduced KNO3. Thermal decomposition behavior of KNO3 studied based on the (temperature programmed decomposition-mass spectromer,TPDE-MS).The thermal decomposition data of KNO3 were analyzed using the KAS method and the F1/3 method, and the corresponding kinetic parameters were derived. The results show that the decomposition of pure KNO3 starts to occur at about 600℃, and the decomposition rate lies in the range of 0.5-0.8 when the decomposition reaction conforms to the model function of the F1/3 method, with a reaction activation energy of 285 kJ/mol; on the high dispersed uranium oxides, the decomposition temperature of KNO3 decreases to 200℃, and the decomposition activation energy is in the range of 205.4-207.3 kJ/mol. Uranium oxides have good catalytic activity for KNO3, resulting in a reduction of the average activation energy of KNO3 thermal decomposition by 72 kJ/mol. |
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