钼酸铵热分解的研究

来源期刊：中南大学学报(自然科学版)1993年第4期

论文作者：尹周澜 赵秦生 陈绍衣 刘国荣 王思清

文章页码：541 - 546

关键词：热分解反应; 钼酸铵; X射线衍射分析; 差热分析; 热重分析

Key words：thermal decomposition; ammonium molybdate; XRD; DTA/TGA

摘    要：采用高温X射线衍射、差热及热重等测试方法,研究了某厂生产的钼酸铵在加热条件下的热分解过程。发现钼酸铵的热分解按以下反应步骤: NH₄₆Mo₇O₂₄·4H₂O→NH₄₄Mo₅O₁₇→NH₄₂Mo₄O₁₃; NH₄₂Mo₄O₁₃和β-NH₄₂Mo₄O₁₃→NH₄₂Mo₁₄O₄₃→NH₄₂Mo₂₂O₆₇→ MoO₃分别在110℃,220℃和290℃三个温度下开始进行,通过扫描电镜观察了热分解过程前后钼酸铵形貌的变化。

Abstract: High temperature XRD and DTA/TGA were employed to study the thermal decomposition of a commercialammonium molybdate which is used as the starting material for the production of molybdenum. The whole pro-cess of decomposition proceeds at three temperatures of 110 ℃, 220 ℃ and 290 ℃ respectively and consists ofthe following reactions steps: NH₄₆Mo₇O₂₄·4H₂O→NH₄₄Mo₅O₁₇→NH₄₂Mo₄O₁₃ NH₄₂Mo₄O₁₃ and β-NH₄₂Mo₄O₁₃→NH₄₂Mo₁₄O₄₃→NH₄₂Mo₂₂O₆₇→MoO₃ The powder morphology after decomposition was also examined with SEM.