Alkane oxyhalogenation has emerged as an attractive catalytic route for selective natural gas functionalization to important commodity chemicals, such as methyl halides or olefins. However, few systems have been shown to be active and selective in these reactions. Here, we identify a novel and highly efficient TiC–SiC composite for methane and ethane oxyhalogenation. Detailed characterization elucidates the kinetics and mechanism of the selective activation under reaction conditions to yield TiO₂–TiC–SiC. This catalyst outperforms bulk TiO₂, one of the best reported catalysts, reaching up to 85 % selectivity and up to 3 times higher titanium‐specific space‐time‐yield of methyl halides or ethylene. This is attributed to the fact that the active TiO₂ phase generated in situ is embedded in the thermally conductive SiC matrix, facilitating heat dissipation thus improving selectivity control.

中文翻译：

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一种用于催化氧卤化天然气提质的活化TiC-SiC复合材料

烷烃氧基卤化已成为一种有吸引力的催化途径，可用于选择性天然气功能化成重要的商品化学品，例如甲基卤化物或烯烃。但是，几乎没有系统显示出在这些反应中具有活性和选择性。在这里，我们确定了一种新型且高效的TiC-SiC复合材料，可用于甲烷和乙烷的氧卤代反应。详细的表征阐明了在反应条件下产生TiO ₂ -TiC-SiC的选择性活化的动力学和机理。该催化剂的性能优于报道得最好的催化剂之一的本体TiO ₂，选择性高达85％，甲基卤化物或乙烯的钛比空时产率提高了3倍。这归因于活性TiO ₂ 原位生成的气相嵌入导热SiC基体中，有利于散热，从而改善了选择性控制。