几种多相钼酸铵的热分解

THERMAL DECOMPOSITION OF THREE COMMERCIAL POLYPHASE AMMONIUM MOLYBDATES

采用差热、热重及高温Ｘ－射线衍射等测试方法，研究了三种不同来源的多相钼酸铵在加热条件下的热分解过程。研究结果表明，多相钼酸铵在加热过程中发生一系列热分解反应放出ＮＨ＿３和Ｈ２＿Ｏ，生成多种钼酸铵中间相。随着反应温度不断升高，中间相的钼含量增高，最终产物为ＭｏＯ＿３，主要热分解反应如下：

DTA/TGA and high temperature XRD were employed to study the thermal dec-omPosition of three commercial polyphase ammonium molybdates.A series of in-termediary phases of amn1onium molybdates were identified during the course ofheating.The content of molybdenum in the intermediary phases increases with inc-rease of temperature, The main decomposition reactions occur in steps as follows:(NH_4)eMo_7O_(24)·4H_2O── →(NH_4)_4Mo_5O_(17)── →(NH_4)_2Mo_4O(13) (NH_4)_2Mo_4O_(13) and β-(NH_4)_2Mo_4O_(13)── →(NH_4)_...