用N2 H2 混合物与MoO3 的程序升温反应合成出大比表面积的γ Mo2 N催化剂。采用原位差热 热重 (DTA TG)技术 ,研究了合成过程中的热变化。DTA结果表明 ,N2 H2 与MoO3 的程序升温反应过程中有放热峰和吸热峰 ,且随着升温速率的减小 ,峰面积逐渐减小。用XRD对合成的中间产物进行表征 ,结果表明 ,DTA曲线中的放热峰可归属为由MoO3 转化为MoO2 的还原峰 ,吸热峰可归属为由MoO2 转化为γ Mo2 N的氮化峰。 The N2 Mo2 N catalyst with large specific surface area was synthesized by temperature-programmed reaction of N2 H2 mixture with MoO3. In situ differential thermal gravimetry (DTA TG) was used to study the thermal changes in the synthesis process. The results of DTA show that there are exothermic peak and endothermic peak during the temperature rising reaction of N2 H2 and MoO3, and the peak area decreases with the decrease of heating rate. The synthesized intermediates were characterized by XRD. The results showed that the exothermic peak in DTA curve could be attributed to the reduction of MoO3 to MoO2, and the endothermic peak could be attributed to the nitration of MoO2 to γ-Mo2N.