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ＣａＯ的晶格氧对甲烷能发生非选择性氧化反应，经反应消耗的晶格氧可以由气相氧中补充，也可以通过体相晶格氧向表面的迁移来补充。Ｎａ￣＋添加剂能抑制ＣａＯ晶格氧的反应活性，当Ｎａ￣＋含量达到５％时，ＣａＯ晶格氧对甲烷的完全氧化活性被完全抑制。Ｃａ＿ｘＳｒ＿（１－ｘ）ＴｉＯ＿３复合氧化物催化剂的晶格氧对甲烷没有活性。只有当气相氧存在时，在５％Ｎａ￣＋／ＣａＯ和Ｃａ＿ｘＳｒ＿（１－ｘ）ＴｉＯ＿３复合氧化物上才能通过气相氧向表面氧物种的转化而引发甲烷氧化偶联反应。
The lattice oxygen of CaO can undergo non-selective oxidation to methane. The lattice oxygen consumed by the reaction can be supplemented by gas-phase oxygen and can also be supplemented by the migration of bulk lattice oxygen to the surface. The Na ~ + additive can restrain the reactivity of CaO lattice oxygen. When Na ~ + content reaches 5%, the complete oxidation activity of CaO lattice oxygen to methane is completely inhibited. Lattice oxygen of Ca_xSr_ (1-x) TiO_3 composite oxide catalyst has no activity on methane. Methane oxidative coupling reaction can be initiated on the 5% Na ~ + / CaO and Ca_xSr_ (1-x) TiO_3 composite oxides only by the conversion of gas phase oxygen to surface oxygen species only in the presence of vapor phase oxygen.