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Dual Active Sites on Molybdenum/ZSM‐5 Catalyst for Methane Dehydroaromatization: Insights from Solid‐State NMR Spectroscopy

 Date:2021/3/9 17:12:04 Views:Times

Methane dehydroaromatization (MDA) on Mo/ZSM‐5 zeolite catalyst provides a promising route for the direct transformation of natural gas into high‐valued chemicals. Understanding the nature of active sites on Mo/ZSM‐5 represents one of the challenges to be resolved for technical application of this process. Herein, by using 1 H{ 95 Mo} double‐resonance solid‐state NMR spectroscopy, we identify proximate dual active sites on Mo/ZSM‐5 catalyst by direct observation of internuclear spatial interaction between Brønsted acid site and Mo species in zeolite channels. The acidic proton‐Mo spatial interaction is correlated with methane conversion and aromatics formation in the MDA process, which is demonstrated to be an important factor in determining the catalyst activity and lifetime. The evolution of olefins and aromatics in Mo/ZSM‐5 channels is monitored by detecting their host‐guest interactions with both active Mo sites and Brønsted acid sites via 1 H{ 95 Mo} double‐resonance and two‐dimensional 1 H‐ 1 H correlation NMR spectroscopy, which reveals the intermediate role of olefins in hydrocarbon pool process during the MDA reaction.



中国科学院精密测量科学与技术创新研究院 (中国科学院武汉物理与数学研究所) 邓风课题组
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