The direct conversion of methane without an oxidant is an attractive approach to increase carbon efficiency. However, the reaction must be engineered appropriately. Herein, we propose a methane to olefins, aromatics, and hydrogen (MTOAH) system in which methane activation is promoted by co-feeding hydrocarbons generated from the Mo/HZSM-5 surface. The intentional separation of the catalyst and the gas-phase reaction at different temperatures (700 °C and 1020 °C) enables active and stable methane conversion via periodic reactions and regenerations. The linkage between MDA and MTOAH using 6Mo/HZSM-5 (30), which notably contributed to increasing the C2 production in MTOAH, was stabilized with 8.2% methane conversion during 49.5 h of the periodic CH reaction-H regeneration cycle. This study provides a new direction for achieving the efficient and carbon-neutral conversion of methane into useful chemicals.

中文翻译：

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甲烷的非氧化直接转化：通过与脱氢芳构化连接提高反应性

无需氧化剂直接转化甲烷是提高碳效率的一种有吸引力的方法。然而，反应必须进行适当的设计。在此，我们提出了一种甲烷转化为烯烃、芳烃和氢气（MTOAH）系统，其中通过Mo/HZSM-5表面产生的共进料碳氢化合物来促进甲烷活化。催化剂和不同温度（700℃和1020℃）下的气相反应的有意分离使得通过周期性反应和再生能够实现活跃和稳定的甲烷转化。 MDA 和 MTOAH 之间使用 6Mo/HZSM-5 (30) 的连接，显着有助于增加 MTOAH 中的 C2 产量，在 49.5 小时的定期 CH 反应-H 再生循环期间，甲烷转化率稳定为 8.2%。这项研究为实现甲烷高效且碳中和地转化为有用化学品提供了新方向。