A series of lanthanum oxide (La₂O₃—2–14 wt%)-encapsulated Co₃O₄/MgO catalysts and bare Co/MgO solid oxides were prepared by wetness impregnation method. Among all catalysts, La₂O₃-promoted Co₃O₄/MgO (CM) was found to be remarkable in terms of superior promotional effect of La oxide species. Therefore, La₂O₃-incorporated Co₃O₄/MgO (LCM) catalysts afforded unusual catalytic activity efficiency with respect to high EB conversion and styrene selectivity due to the synergistic effect of Co–La species. By contrast, bare Co₃O₄/MgO solid oxide (CM) catalyst afforded low EB conversion with mild catalytic activity due to the absence of promotional role of La oxide.

采用湿法浸渍法制备了一系列包埋氧化镧（La ₂ O ₃ -2-14 wt％）的Co ₃ O ₄ / MgO催化剂和裸露的Co / MgO固体氧化物。在所有催化剂中，发现La ₂ O ₃促进的Co ₃ O ₄ / MgO（CM）就La氧化物种类的优异促进效果而言是显着的。因此，由于Co-La的协同作用，结合La ₂ O _3的Co ₃ O ₄ / MgO（LCM）催化剂在高EB转化率和苯乙烯选择性方面提供了非同寻常的催化活性效率。相比之下，裸Co₃ O ₄ / MgO固体氧化物（CM）催化剂提供了低的EB转化率，并且由于没有La氧化物的促进作用而具有中等的催化活性。