Cobalt‐loaded MFI zeolite showed distinct activity for direct methylation of benzene with methane into toluene. High activity was found at around 0.6 of Co/Al molar ratio. Incorporation of carbon from methane into the methyl group of toluene was confirmed with isotope tracer experiments and mass spectroscopy. Ammonia infrared‐mass spectroscopy temperature‐programmed desorption, transmission electron microscopy, X‐ray absorption near edge spectroscopy and extended X‐ray absorption fine structure indicated that Lewis acidic divalent (+II of oxidation state) Co species mono‐atomically dispersed on the ion exchange site of MFI zeolite was the active species.

中文翻译：

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Co/MFI 沸石催化甲烷与苯直接甲基化

负载钴的 MFI 沸石对苯与甲烷直接甲基化成甲苯表现出明显的活性。Co/Al 摩尔比约为 0.6 时发现高活性。同位素示踪实验和质谱证实了甲烷中的碳并入甲苯的甲基中。氨红外质谱、程序升温脱附、透射电子显微镜、X射线吸收近边光谱和扩展X射线吸收精细结构表明Lewis酸性二价（氧化态+II）Co物种单原子分散在离子上MFI沸石的交换位点是活性物质。