Studies on the Thermal Change and Intermediate Involved in the Synthesis of γ-Mo2N

Abstract

Abstract: The thermal change in the synthesis of γ-Mo₂Nby temperature-programmedreaction of MoO₃ with ammonia has been studied by differential thermal analysis (DTA)technique, IR, BETand XRDmeasurements. The DTA results show that both exothermic andendothermic peaks appear in the process. With the increase of temperature-elevation rate,the areas of the exothermic peaks increase, and the areas of the endothermic peaks decrease.XRDand IRresults show that the exothermic peaks are attributed to the reduction of MoO₃to MoO₂ and the endothermic peaks can be assigned to the nitridation of MoO₂ to γ-Mo₂N.The nitriding product is γ-Mo₂Nat the lower rates of increasing temperature (≤3 K/min),whereas the products are γ-Mo₂Nand MoO₂ at the higher heating rates(≥5 K/min). Andthe higher the rate, the more MoO₂ was formed in the final product. It is suggested that NH₃first interacts with MoO₃ and reduces the MoO₃ into MoO₂, and then the MoO₂ is nitridedin to γ-Mo₂N.

Key words: γ-Mo₂N synthesis, DTA technique, Intermediate

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YANG Shu-Wu: XU Jiang, YAN Wei-Hong, YING Pin-Liang, GAO Xiu-Ying, QI Xing-Yi, XIN Qin. Studies on the Thermal Change and Intermediate Involved in the Synthesis of γ-Mo₂N[J]. Chem. J. Chinese Universities, 1997, 18(10): 1675.

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Studies on the Thermal Change and Intermediate Involved in the Synthesis of γ-Mo₂N

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