The different chemical states and locations of Ni species in HZSM-5 result in different directions of CH4 reaction. Supported Ni clusters caused complete CH4 decomposition, while Ni-exchanged sites anchored at Brønsted acid sites, can appropriately activate CH4 into CHx species which are important precursors to produce aromatics. This study suggests a catalyst construction strategy for selective conversion of CH4 towards value-added chemicals by placing active metal at specific sites.

中文翻译：

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在不存在氧气的情况下，通过Ni / HZSM-5催化剂进行的CH4转化：分解还是脱氢芳构化？

HZSM-5中Ni物种的不同化学状态和位置会导致CH4反应的不同方向。负载的Ni团簇导致CH4完全分解，而锚定在Brønsted酸位点上的Ni交换位点则可以适当地将CH4活化为CHx物种，CHx是产生芳烃的重要前体。这项研究提出了通过将活性金属放置在特定位置来选择性地将CH4转化为增值化学品的催化剂构造策略。