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自Lunsford等首次报道在Li/MgO催化剂上的甲烷氧化偶联(OCM)以来,许多研究者相继报道了添加碱金属对该反应的影响,其中以Li的添加最受关注。Li在OCM反应中对提高C_2烃选择性的作用最为明显,因而弄清Li在这一反应中的作用十分必要。本文讨论了Li在几个有代表性的碱土(CaO)及稀土(La_2O_3)中的存在形式与生成C_2产物的关系。
Since Lunsford et al. First reported on the oxidative coupling of methane (OCM) on Li / MgO catalysts, many researchers reported the effects of adding alkali metals to the reaction one after another, among which the most attention was paid to the addition of Li. The most obvious effect of Li on improving C 2 hydrocarbon selectivity in the OCM reaction is to clarify the role of Li in this reaction. In this paper, we discuss the relationship between the existing forms of Li in several representative alkaline earth (CaO) and rare earth (La_2O_3) and the formation of C_2 products.