Catalytic Effect of Highly Dispersed State Uranium Oxides on the Thermal Decomposition of Potassium Nitrate
High Dispersed Uranium oxides were obtained by hydrothermal method using SBA-15 as a carrier,and later introduced KNO3.Thermal decomposition behavior of KNO3 was studied based on the(temperature programmed decomposition-mass spectromer,TPDE-MS).The thermal decomposition data of KNO3 were analyzed using KAS method and 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 when the decom-position rate lies in the range of 0.5-0.8,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 aver-age activation energy of thermal decomposition of KNO3 was reduced by 30 and 74 kJ/mol using KAS and F1/3 mothods,respectively.
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