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首页> 外文期刊>質量分析 >TG-DTA-MAS and controlled-rate TG of ammonium oxalate monohydrate (NH_4)C_2O_4 centre dot H_2O
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TG-DTA-MAS and controlled-rate TG of ammonium oxalate monohydrate (NH_4)C_2O_4 centre dot H_2O

机译：草酸铵一水合物 （NH_4） 的 TG-DTA-MAS 和控制速率 TG C_2O_4中心点 H_2O

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摘要

Ammonium oxalate monohydrate (NH_4)_2C_2O_4 centre dot H_2O was investigated by TG-DTA-MS and controlled-rate TG. The decomposition process in both inert and simulated air atmospheres was successfully clarified; the gaseous products evolved with three endothermic mass losses were confirmed by the mass detection. Detection of ammonia from the dehydrate (NH_4)_2C_2O_4 supported the formation of ammonium hydrogen oxalate (NH_4)HC_2O_4 which decomposed at the higher temperature to form ammonia, water vapor, carbon monoxide and carbon dioxide. The successive mass losses were clearly separated and characterized by controlled-rate thermogravimetry, CRTG. The well-defined mass loss curve brought by CRTG agreed excellently with the theoretical mass losses calculated based upon formation of anhydrous ammonium oxalate and ammonium hydrogen oxalate, respectively. The gaseous products detected under the thermo-oxidative decomposition were attributed to the oxidized products for those obtained under the inert atmosphere. Thermal change in the oxidation atmosphere accompanied nitrogen monoxide NO, extra formation of water vapor and carbon dioxide. The decomposition mechanism was little affected by the atmospheric differences. The decomposition mechanism of (NH_4)_2C_2O_4 centre dot H_2O was proposed.
机译：通过TG-DTA-MS和控制速率TG研究了草酸铵一水合物（NH_4）_2C_2O_4中心点H_2O。成功阐明了惰性大气和模拟空气气氛中的分解过程;通过质量检测证实了三次吸热质量损失演化的气态产物。从脱水物（NH_4）中检测到氨_2C_2O_4支持草酸氢铵（NH_4）的形成HC_2O_4该铵在较高温度下分解形成氨、水蒸气、一氧化碳和二氧化碳。连续的质量损失被清楚地分开，并通过控制速率热重法（CRTG）进行表征。CRTG得出的明确质量损失曲线与基于无水草酸铵和草酸氢铵形成计算的理论质量损失非常吻合。在热氧化分解下检测到的气态产物归因于在惰性气氛下获得的氧化产物。氧化气氛中的热变化伴随着一氧化氮NO，水蒸气和二氧化碳的额外形成。分解机理受大气差异的影响很小。提出了（NH_4）_2C_2O_4中心点H_2O的分解机理。

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