制备了不同 Na、W、Mn组分的 Na- W- Mn/ Si O2 催化剂 ,并进行了甲烷氧化偶联反应催化性能的评价和XPS、XRD、L RS表征 .研究结果表明 ,Na不但有强的表面富集能力 ,而且可以使 Mn向表面发生迁移 .首次发现 Na2 W2 O7也是活化甲烷的活性相 .活化甲烷的活性中心是 Na- O- Mn和 Na- O- W结构单元 ,且 Na- O-Mn主要存在于催化剂的表面 ,Na- O- W则分布在距催化剂表面较深的部位 The Na-W-Mn / Si O2 catalysts with different Na, W and Mn components were prepared and the catalytic performance of methane oxidation coupling reaction was evaluated and characterized by XPS, XRD and LRS.The results showed that not only Na And can migrate Mn to the surface.It is also found for the first time that Na2 W2 O7 is also the active phase of activated methane.The active centers of activated methane are Na- O- Mn and Na- O- W structural units, and Na- O-Mn is mainly present on the surface of the catalyst, while Na-O-W is located at a deeper position from the surface of the catalyst