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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)
A series of catalysts LiLa_ (1-x) Mn_xO_ (2-λ) (x = 0-1) were examined for the oxidative coupling of methane. A high C_2 yield of 22% was obtained. The structures and physico-chemical properties of samples was 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 the active phase for methane coupling, while the Li 2 MnO 3 and LiMn 2 O 4 were the active phases for complete oxidation of re.ethane. The increase of catalytic activity for methane coupling was attributed to the increase of the amount of active site, namely, oxygen vacancy in oxide La_2Mn_ (1 -y) Li_yO_ (4-λ)