火箭推进

为了获得硝酸羟铵水体系的分解性能,利用TG-DSC技术测试和研究了硝酸羟铵(HAN)水溶液的热分解和催化分解特性,通过测试不同升温速率下的分解曲线,对HAN水溶液的热分解动力学进行了研究,在此基础上,通过傅里叶红外(FTIR)和在线质谱(MS)对硝酸羟铵水溶液的催化分解气体产物进行分析。研究结果表明:HAN水溶液的催化分解放热峰是109.8 ℃,比热分解放热峰155.6 ℃提前了45.8 ℃; 利用Kissinger和Fly-Wall-Ozawa方程得出HAN水溶液热分解活化能和催化分解活化能分别是110.6 kJ/mol和87.8 kJ/mol; 催化剂的加入能降低HAN的活化能,使其分解温度提前; 硝酸羟铵水溶液催化分解的气体产物主要是NO,N2和N2O,并提出了其可能的催化分解机理。

In order to study the decomposition performance of hydroxyl ammonium nitrate,the thermal decomposition and catalytic decomposition of the hydroxyl ammonium nitrate(HAN)solution were investigated by using the TG-DSC technology.The decomposition kinetic of HAN solution was researched by testing at different heating rate and the major gas phase products were measured by MS and FTIR.The results showed that the peak temperature of catalytic decomposition and thermal decomposition were 109.8 ℃ and 155.6 ℃ respectively.The peak temperature of catalytic decomposition was decreased by 45.8 ℃ compared to the peak temperature of thermal decomposition.The activation energy of the thermal decomposition and catalytic decomposition were 110.6 kJ/mol and 87.8 kJ/mol respectively by Kissinger and Fly-Wall-Ozawa equation.The addition of catalyst could reduce decomposition activation energy of HAN-water solution and make the decomposition temperature reduced.The major gas phase products were NO, N2 and N2O.A possible mechanism of catalytic decomposition was proposed.

引言
1 实验
2 结果讨论
3 结论

图1 HAN水溶液的TG曲线<br/>Fig.1 The TG curve of the HAN aqueous solution

图1 HAN水溶液的TG曲线
Fig.1 The TG curve of the HAN aqueous solution

图2 HAN水溶液的DSC曲线<br/>Fig.2 The DSC curve of the HAN aqueous solution

图2 HAN水溶液的DSC曲线
Fig.2 The DSC curve of the HAN aqueous solution

图3 不同升温速率下HAN水溶液的分解曲线<br/>Fig.3 DSC curves of HAN aqueous solution at different heating rates

图3 不同升温速率下HAN水溶液的分解曲线
Fig.3 DSC curves of HAN aqueous solution at different heating rates

表1 不同升温速率下HAN水溶液的分解放热峰温度<br/>Tab.1 DSC date of the HAN aqueous solution at different heating rates

表1 不同升温速率下HAN水溶液的分解放热峰温度
Tab.1 DSC date of the HAN aqueous solution at different heating rates

图4 ln(β/Tp2)～1 000/Tp关系曲线<br/>Fig.4 The curve of ln(β/Tp2)～1 000/Tp

图4 ln(β/Tp2)～1 000/Tp关系曲线
Fig.4 The curve of ln(β/Tp2)～1 000/Tp

图5 lg β～1 000/Tp关系曲线<br/>Fig.5 The curve of lg β～1 000/Tp

图5 lg β～1 000/Tp关系曲线
Fig.5 The curve of lg β～1 000/Tp

表2 HAN水溶液的分解活化能数据<br/>Tab.2 Activation energy of HAN aqueous solution by different methods

表2 HAN水溶液的分解活化能数据
Tab.2 Activation energy of HAN aqueous solution by different methods

表3 从TG曲线获得不同转化率下HAN水溶液的分解的动力学参数<br/>Tab.3 Arrhenius parameters for the thermal decomposition of HAN aqueous solution on TG

表3 从TG曲线获得不同转化率下HAN水溶液的分解的动力学参数
Tab.3 Arrhenius parameters for the thermal decomposition of HAN aqueous solution on TG

图6 HAN水溶液催化分解产物的红外谱图<br/>Fig.6 The infrared specturm of catalytic decomposition products of HAN aqueous solution

图6 HAN水溶液催化分解产物的红外谱图
Fig.6 The infrared specturm of catalytic decomposition products of HAN aqueous solution

图7 样品的催化分解产物气相质谱<br/>Fig.7 The mass spectrometry of catalytic decopmpsotion

图7 样品的催化分解产物气相质谱
Fig.7 The mass spectrometry of catalytic decopmpsotion

图8 主要气体产物及离子碎片的相对浓度<br/>Fig.8 The relative concentration of main gas production and ionic fragments

图8 主要气体产物及离子碎片的相对浓度
Fig.8 The relative concentration of main gas production and ionic fragments

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备注

引言

1 实验

2 结果讨论

3 结论

期刊信息