Fe-Mo系氧化物固相热反应机理及界面结构

Mechanism and Interface Structure of Solid Thermal Reaction of Fe-Mo System Oxide

干混法制取不同Ｆｅ／Ｍｏ原子比的Ｆｅ２Ｏ３－ＭｏＯ３体系，经５００℃焙烧５ｈ，应用ＦＴ－ＩＲ及其差谱、ＤＴＡ、ＸＲＤ等表征手段，研究了焙烧过程中固相热反应的机理和界面结构，证明除有新晶相Ｆｅ２（ＭｏＯ４）３生成之外，还有非晶相的Ｆｅ２Ｏ３及ＭｏＯ３新物种产生，其非晶相量分别为２．９ｗｔ％及９．８ｗｔ％。Ｆｅ２（ＭｏＯ４）３的最大生成量为１５ｗｔ％。讨论了反应温度与催化剂失活（选择性降低）的关联，指出了“缺钼”的机理所在。

The mechanism and interface structure of solid thermal reaction o fFe-Mo system oxide have been studied by XRD, FT-IR and DTA techniques. Dry mixed Fe-Mo oxide samples were prepared with different Fe/Mo atom ratio and calcinated at 500℃ for 5h. New species formed by thermal reaction are the noncrystalline Fe 2O 3(392-419cm -1 IR spectrapeaks, 2.9wt% amount) and MoO 3 (960cm -1 , 9.8wt%) unless crystalline Fe 2(MoO 4) 3(832-838cm -1 , 15wt% maximum amount).