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采用较为普及的GC -MSD结合TPDE方法研究了KNO3 在沸石上热分解的产物分布 从K2 CO3 /KL的TPDE入手 ,首先证明了GC -MSD方法的可靠性和重复性 ;通过负载 5 ,10和 30wt.- %KNO3 的KL沸石上KNO3 热分解产物的辨认和分析 ,推断KNO3 在沸石上的分解大致可分为 2个阶段 :第一阶段在 6 0 0℃以下发生 ,主要产生N2 O和NO及N2 ;第二阶段的主要产物是NO2 ,发生在 6 0 0℃以上的高温区 .通过剖析分解第一阶段产物中N2 和NO之比 ,发现产生较多的N2 ,进而推断KNO3 在KL沸石分解会产生较多的钾氧化物而促成强碱位的形成 .结果表明 ,沸石与负载的KNO3 之间的相互作用是影响KNO3 分解、乃至形成超强碱新材料的重要因素 .
The product distribution of thermal decomposition of KNO3 on zeolite was studied by using the more popular GC-MSD combined with TPDE method from TPDE of K2 CO3 / KL. The reliability and repeatability of GC-MSD method were first demonstrated. The identification and analysis of KNO3 thermal decomposition products on 30wt .-% KNO3 KL zeolite concluded that the decomposition of KNO3 on zeolite can be roughly divided into two stages: the first stage occurs below 600 ℃, mainly producing NO and NO And N2.The main product of the second stage is NO2, which occurs in the high temperature region above 600 ℃ .It is found that more N2 is produced by analyzing the ratio of N2 to NO in the first stage of product decomposition, Decomposition will produce more potassium oxide and promote the formation of strong base.The results show that the interaction between zeolite and supported KNO3 is an important factor that affects the decomposition of KNO3 and even the formation of new super alkaline materials.