| 摘 要： | A series of catalysts LiLa_(1-x)Mn_xO_(2-λ)(x=0—1)were examined for the oxidative couplingof methane.A high C_2 yield of 22％ was obtained.The structures and physico-chemical properties ofsamples have been studied by means of XRD,IR,XPS and SEM.It was found that some complex ox-ides could be formed as X value changed,among them the K_2NiF_4-type oxide La_2Mn_(1-y)Li_yO_(4-λ)was theactive phase for methane coupling,while the Li_2MnO_3 and LiMn_2O_4 were the active phases for completeoxidation of re.ethane.The increase of catalytic activity for methane coupling was attributed to theincrease of the amount of active site,namely,oxygen vacancy in oxide La_2Mn_(1-y)Li_yO_(4-λ)
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