Dual Active Sites on Molybdenum/ZSM-5 Catalyst for Methane Dehydroaromatization: Insights from Solid-State NMR Spectroscopy.
Dual Active Sites on Molybdenum/ZSM-5 Catalyst for Methane Dehydroaromatization: Insights from Solid-State NMR Spectroscopy.
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用于甲烷脱氢芳构化的钼/ZSM-5 催化剂上的双活性位点:来自固态核磁共振波谱的见解。
DOI:
10.1002/anie.202017074
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发表时间:
2021-05-03
期刊:
影响因子:
--
通讯作者:
Deng F
中科院分区:
文献类型:
--
作者:
Gao W;Qi G;Wang Q;Wang W;Li S;Hung I;Gan Z;Xu J;Deng F
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 1H{95Mo} 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 1H{95Mo} double-resonance and two-dimensional 1H-1H correlation NMR spectroscopy, which reveals the intermediate role of olefins in hydrocarbon pool process during the MDA reaction. The bifunctional acidic proton-carburized Mo active site in Mo/ZSM-5 zeolite was revealed by probing their spatial proximity using double-resonance solid-state NMR spectroscopy. The spatial interaction of the dual site governs the activity of the catalyst for MDA reaction.
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影响因子:
16.6
作者:
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