The efficient catalysts of strontium oxide (SrO_x) supported on exposed {2 2 2} facets of pyrochlore La₂Zr₂O₇ nanocrystals (SrO_x/LZO-Y) were elaborately synthesized by incipient wetness impregnation method. The introduction of atomically dispersed SrO_x species on La₂Zr₂O₇ surface can increase the amount of surface oxygen vacancies induced by Sr²⁺ substitution of La³⁺ cations, and the increasing of moderate surface alkaline sites are beneficial to enhance catalytic performance for oxidative coupling of methane (OCM). The SrO_x/LZO-Y catalysts have super catalytic performance during low-temperature OCM reaction. SrO_x/LZO-12 catalyst with the highest concentrations of O₂^– species exhibits the highest activity and the lowest apparent activation energy (84 kJ mol⁻¹) during low-temperature OCM into C₂H₄ and C₂H₆ (C₂) products, i.e., its CH₄ conversion, selectivity and yield of C₂ products at 600 °C are 30.5 %, 47.4 % and 14.5 %, respectively, and its ratio of C₂H₄/C₂H₆ products is 0.77. Based on the results of multiple experimental characterizations, the mechanism of SrO_x/LZO-Y catalysts for OCM reaction is proposed: the surface alkaline active centers (O₂^–) induced by doping of Sr ions can promote the critical step of CH₄ activation significantly during low-temperature OCM reaction. It is a new strategy to develop the low-temperature and high-activity catalysts for OCM in practical application.

采用初湿浸渍法精心合成了负载在烧绿石La ₂ Zr ₂ O ₇纳米晶（SrO _x /LZO-Y）外露{2 2 2}晶面上的氧化锶（SrO _{x ）高效催化剂。在La 2} Zr ₂ O ₇表面引入原子级分散的SrO _x物种可以增加由Sr ²⁺取代La ³⁺阳离子引起的表面氧空位的数量，而适度的表面碱性位点的增加有利于提高催化性能用于甲烷的氧化偶联 (OCM)。氧化锶  _x /LZO-Y催化剂在低温OCM反应中具有超强的催化性能。SrO _x /LZO-12 催化剂^在低温OCM 生成^C ₂ H ₄和C _{2 H 6} ( C ₂ ) 产物，即其CH ₄转化率、C ₂产物在600℃时的选择性和收率分别为30.5 %、47.4 %和14.5 %，其比值为C ₂ H ₄ /C ₂ H_{6 个}产品是 0.77。基于多项实验表征结果，提出了SrO _x /LZO-Y催化剂用于OCM反应的机理：Sr离子掺杂诱导的表面碱性活性中心（O ₂ ^-）可以促进CH ₄活化的关键步骤在低温OCM反应过程中显着。开发用于OCM的低温高活性催化剂在实际应用中是一种新的策略。