碱金属掺杂的碱土金属氧化物对甲烷偶联反应的影响

Effect of Doped Alkali in Alkaline Eerth on Catalytic Properties for Oxidative Coupling of Methane

用急冷ＥＳＲ方法系统地研究了Ｌｉ／ＭｇＯ、Ｌｉ／ＣａＯ中Ｏ￣－物种的形成过程及性质．并通过甲烷分子的低温活化实验，验证Ｏ－物种对甲烷生成Ｃ＿２产物的作用．将催化活性同Ｏ￣－物种很好地关联起来，通过ＣＯ＿２的吸附性能及荧光光谱的研究，指出在甲烷氧化偶联反应中，碱性对生成Ｃ＿２的作用要远小于Ｏ￣－的作用。

By means of MIESR technique formation and properties of O￣- species in Li/MgO and Li/CaO were studied systematically.Based upon experimental data of low temperature activation of methane molecule,the function of O-species for the C2 hydrocarbons formation from methane was identified.The catalytic performance and accounts of O-species were well correlated.Experimental results on adsorption properties of CO2 and fluorescence emission of the samples exhibited that basicity is less important than O-species for C2 formation in oxidative coupling of methane.